Silver Sport Transmissions
Silver Sport Transmissions designs and sells custom-engineered TREMEC-based PerfectFit overdrive transmission conversion kits for classic cars, street rods, and trucks, serving performance enthusiasts and professional builders via direct e-commerce, phone sales, and a US dealer network with international shipping.
- Company typePrivate
- Founded2014
- HeadquartersRockford, United States
- Headcount11–50
- GTM typeB2C
- OfferingHardware or Manufacturing
What Silver Sport Transmissions does
Silver Sport Transmissions (SST) is a Tennessee-based specialty manufacturer and distributor of premium overdrive transmission conversion kits, primarily serving the classic car, street rod, and muscle truck aftermarket. Founded in 2014 by Jack Silver, the company is a designated TREMEC Elite Distributor and sells modified TREMEC manual transmissions (TKX 5-speed, Magnum 6-speed, Magnum XL, Magnum-F, TR-4050, T-5, TKO) alongside its proprietary A41 automatic platform and complementary components (bellhousings, flywheels, clutches, hydraulics, crossmembers, STX short-throw shifters). Its core differentiator is the PerfectFit™ kit system: in-house engineers modify transmission cases for correct shifter location, driveline angles, and tunnel clearance, then bundle the transmission with crossmembers, hydraulic clutch systems, and installation hardware into single turnkey kits spanning GM, Ford, Mopar, and AMC vehicle applications.
The company operates a sales-led, omnichannel go-to-market combining direct e-commerce, phone-based inside sales, and a US dealer network, with international direct shipping to customers in Australia, Canada, the UK, Germany, Italy, the Netherlands, and Switzerland. Revenue is generated primarily through one-time hardware sales of kits (typically $3,500+ per kit) and individual components, supplemented by an in-house technical support service and consumer-friendly financing via the proprietary 10-10-10 PerfectPay layaway program and Affirm installment lending (3–24 month terms). Since July 2021, SST has operated as a subsidiary of the Wharton Automotive Group, a Paul Lee-owned conglomerate that also controls McLeod Racing, FTI Performance, and (since October 2022) PowerTrain Technology.
SST's customer base is predominantly long-tail, comprising individual performance enthusiasts and professional builders, with brand visibility amplified through sponsorships (NHRA Nitro Funny Car), SEMA/PRI trade show presence, and collaborations with TV builders (Graveyard Carz) and complementary performance brands (Schwartz Performance, RideTech, Wilwood). With 11–50 employees and no public revenue disclosure, the company sits as a focused, niche specialist within the broader Wharton Automotive Group's integrated drivetrain portfolio.
Silver Sport Transmissions firmographics
Firmographics- Name
- Silver Sport Transmissions
- Legal name
- Silver Sport Transmissions
- Website
- https://shiftsst.com
- Company type
- Private
- Founded year
- 2014
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Silver Sport Transmissions designs and sells custom-engineered TREMEC-based PerfectFit overdrive transmission conversion kits for classic cars, street rods, and trucks, serving performance enthusiasts and professional builders via direct e-commerce, phone sales, and a US dealer network with international shipping.
- Ownership category
- akta.pro rank
Silver Sport Transmissions industry classification
Industry- Product category
- Performance Transmission Conversion Kits
- NAICS
- Motor Vehicle Transmission and Power Train Parts Manufacturing (33635)
- SIC
- Wholesale-Motor Vehicle Supplies & New Parts (5013), Wholesale-Motor Vehicles & Motor Vehicle Parts & Supplies (5010)
- akta.pro primary industry
- Passenger Vehicle Transmission & Drivetrain Systems Manufacturing (ICE) (IMACAAAG)
- akta.pro secondary industries
- Transmission & Transaxle Manufacturing (Manual/Automatic/DCT/CVT) (IMACAHAE), Clutch, Torque Converter & Flywheel Manufacturing (IMACAHAI)
Keywords
Where Silver Sport Transmissions is headquartered
LocationHeadquarters
- HQ city
- Rockford
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Silver Sport Transmissions business model
Business model- GTM type
- B2C
- Offering type
- Hardware or Manufacturing
- Cost components
- Supply Chain, Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure
Revenue model
- Transmission Kit Sales: Complete PerfectFit transmission kits for various vehicle applications including GM, Ford, Mopar, and AMC vehicles. Kits include modified TREMEC transmissions (TKX, Magnum, Magnum XL, Magnum-F, TR-4050, T-5, TKO), crossmembers, hydraulic clutch components, and installation hardware.
- Individual Component Sales: Individual product sales including shifters (STX Performance Short Throw Shifters), bellhousings, flywheels, clutches, hydraulics, crossmembers, and other drivetrain components for vehicle builds and upgrades.
- Technical Services: Technical support provided by in-house experts including sales representatives, technical service representatives, and engineering staff. Customers can access tech support via phone for installation guidance and product selection.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Unit Pricing | Pay-as-you-go | STX Shifters - TREMEC TKX Front Shift Conversion Kit |
| Transaction based/ take rate | Multi-year contract | 10-10-10 PerfectPay Layaway Program |
| Transaction based/ take rate | Monthly | Affirm Financing |
| One time/ perpetual license | Pay-as-you-go | Custom Transmission Kit Quoting |
Go-to-market motion2 records
Distribution channels4 records
Marketing channels7 records
Silver Sport Transmissions product offering
Product offeringCore offering
Silver Sport Transmissions designs, engineers, and sells custom PerfectFit overdrive transmission conversion kits built around TREMEC manual and GM 4L60E automatic transmissions for installing modern drivetrains into classic American cars, trucks, and street rods. The kits bundle a modified transmission with application-specific crossmembers, hydraulic clutch systems, shifters, speedometer components, and all mounting hardware to deliver a turnkey installation with correct shifter location and driveline geometry.
Product overview
Silver Sport Transmissions is a TREMEC Elite Distributor specializing in custom-engineered PerfectFit Transmission Kits for classic cars, street rods, and trucks. The core product portfolio centers on TREMEC manual transmissions (TKX 5-speed, Magnum 6-speed, Magnum XL, Magnum-F, T-5, TR-4050) and the A41 automatic transmission, all sold as complete conversion kits or standalone components. The company offers complementary product lines including STX Short Throw Shifters, bellhousings, flywheels, clutches, hydraulics, crossmembers, and specialty conversion kits (EZ-LS). Their PerfectFit kits are distinguished by in-house engineering modifications that achieve correct shifter location, minimize tunnel interference, and maintain proper driveline angles, with over 100 years of combined experience in overdrive transmission conversions. The company was acquired by the Wharton Automotive Group (McLeod Racing, FTI Performance) in July 2021 and continues to operate from Rockford, TN.
Differentiator
Problem solved
Functional benefit
Brands
- STX Shifters: Performance short throw shifters designed to replace factory TREMEC shifters with shorter, more positive throws and bolt-action shift quality.
- PerfectFit Kits
- A41/A41X PerfectFit Automatic
- 10-10-10 PerfectPay
Products and services
- TREMEC TKX 5-Speed Transmission Performance 5-speed manual transmission with 600 lb-ft torque capacity and a streamlined rounded case for tight transmission tunnel fitment without cutting in most applications, sold standalone by Silver Sport Transmissions.
- TREMEC Magnum 6-Speed Transmission Heavy-duty street performance 6-speed manual transmission with 700 lb-ft torque capacity and double overdrive, the flagship transmission in the Silver Sport Transmissions lineup.
- TREMEC Magnum XL Transmission Longest aftermarket transmission offered by TREMEC, available in Ford and GM versions for late-model swaps requiring extended input shaft lengths and high torque capacity.
- TREMEC Magnum-F Transmission Replacement upgrade for 4th-Gen GM F-body T-56 transmissions (1993-2002 Camaro and Firebird) with 4th-Gen F-body shifter location preserved.
- TREMEC T-5 Transmission 5-speed manual transmission for moderately powered Fords, 1968-1979 Corvette, and Mopar A-bodies with 300 lb-ft torque capacity.
- TREMEC TR-4050 Transmission 5-speed manual transmission available in 4WD, GM 2WD, and Ford 2WD configurations for off-road and truck applications.
- PerfectFit Transmission Kits Complete turnkey conversion kits featuring modified TREMEC transmissions with custom crossmembers, hydraulic clutch systems, shifter mechanisms, speedometer components, and all mounting hardware for specific vehicle applications.
- A41 PerfectFit Automatic Transmission Kits Automatic 4-speed transmission kits based on GM 4L60E with electronic controller, available in three torque stages (450, 550, 650 lb-ft) for GM and Mopar vehicles.
- STX Short Throw Shifters Performance short throw shifters reducing shift travel by 30-50%, providing bolt-action shift quality with a compact design suitable for factory console fitment and available in multiple positions.
- SST Reproduction Bellhousings SST aluminum reproduction bellhousings and SFI Steel Scattershields for various engine and transmission combinations, including the GM 621 in titanium-aluminum alloy 50% thicker than OE.
- Flywheels Billet steel flywheels engineered for high-quality performance applications and sold individually through Silver Sport Transmissions.
- Clutches Performance clutch kits including McLeod Racing RST (up to 800 HP) and RXT (up to 1200 HP) street clutches, plus clutch kits sold within PerfectFit conversion packages.
- Hydraulics Complete hydraulic clutch conversion kits with a Concentric Slave Cylinder bearing rated for 1,000,000 duty cycle life, sold standalone and as part of PerfectFit kits.
- Crossmembers Engineered transmission crossmembers maintaining proper driveline angle with exhaust clearance for specific vehicle applications, sold standalone and as part of PerfectFit kits.
- EZ-LS Conversion Kit Complete kit allowing LS engine conversion to TREMEC TKO or Muncie 4-speed transmissions, including needle roller pilot bearing, billet steel flywheel, McLeod Racing clutch kit, SST Super Duty bellhousing, and complete hydraulic clutch conversion.
- Speed Analyzer Tool Online tool for performance enthusiasts to calculate gear ratios, top speed, crawl ratios, and other drivetrain specifications based on tire size, engine RPM, and transmission gearing.
Quantifiable outcome
- 30% reduction in cruising RPMs
- +2 more outcomes
Companies that use Silver Sport Transmissions
Customer profileNamed customers9 records
Segments4 records
Ideal customer profiles4 records
Silver Sport Transmissions technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Integration1 record
Feature5 records
Silver Sport Transmissions partnerships and signals
Strategic signalPartnerships
Twelve partnerships are on record, tiered minor, flagship and core.
- DENSOminorDENSO provides sponsorship support for Paul Lee Racing's Nitro Funny Car entry at Sonoma Raceway. Paul Lee's racing program includes Silver Sport Transmissions branding.
- Zurn Elkay Water SolutionsminorNew marketing partner supporting Paul Lee Racing's Nitro Funny Car program at Sonoma Raceway alongside Silver Sport Transmissions branding.
- PowerTrain Technology (PTT)minorPowerTrain Technology small-diameter racing clutch and drivetrain component line acquired by Wharton Automotive Group, now part of the group including McLeod Racing, FTI Competition Converters, Silver Sport Transmissions, and PTT.
- Wharton Automotive GroupflagshipWharton Automotive Group, owned by Paul Lee, acquired Silver Sport Transmissions. The group consists of McLeod Racing, FTI Performance, and now Silver Sport Transmissions, becoming the premier destination for aftermarket and performance driveline components worldwide.
- TREMECcoreSilver Sport Transmissions is appointed as one of TREMEC's Elite Distributors, recognized for selling the highest quality TREMEC products and providing outstanding customer service. SST is the market leader in TREMEC 5 and 6-speed PerfectFit kits.
- Graveyard CarzminorGraveyard Carz TV show built a 1971 Plymouth Cuda featuring Silver Sport Transmissions TREMEC Magnum 6-Speed PerfectFit Kit. Featured on Season 6 of the show and debuted at 2016 SEMA show.
- Magnum Force Race Car FabricationminorPartnered on the 1971 Hemi Cuda build with Graveyard Carz, providing Modular Suspension systems. Collaborated with SST on PerfectFit kit installation.
- RaybestosminorRaybestos partnered with Schwartz Performance and Silver Sport Transmissions to sponsor a 1969 Mustang restomod giveaway build featuring SST transmission products.
- Schwartz PerformanceminorSchwartz Performance G-Machine Chassis featured with Silver Sport Transmissions T56 Magnum in Ryan Buck's Camaro build. Collaborative build featured on social media and YouTube.
- CarBuff NetworkminorCarBuff Network collaborated with TREMEC on the SASQUATCH 1979 Jeep Wagoneer build featuring Silver Sport Transmissions products, debuting at 2022 SEMA Show in TREMEC display booth.
- McLeod RacingcoreMcLeod Racing is part of Wharton Automotive Group (owner of Silver Sport Transmissions). Provides high-performance clutches and drivetrain components including hydraulic bearings used in SST PerfectFit kits.
- FTI PerformancecoreFTI Performance (acquired by Paul Lee in 2019) is part of Wharton Automotive Group alongside Silver Sport Transmissions, providing racing transmissions and torque converters.
Scale indicators4 records
Recent moves6 records
Expansion highlights6 records
Silver Sport Transmissions competitors and assessment
Company assessmentDirect peers
- Modern Driveline: Specializes in modern manual transmission swaps into classic Mustangs, Camaros, and other American muscle cars, directly competing for the same enthusiast and restorer segments SST serves with TREMEC-based kits.
- American Powertrain: Direct competitor selling TREMEC-based manual transmission conversion kits and components for classic American cars and trucks, overlapping almost entirely with SST's PerfectFit kit product line and target customer base.
- Gear-Vendors (Underdrive Inc.): Manufactures underdrive/overdrive add-on units for classic vehicles, an alternative solution to SST's full transmission swap approach for customers seeking overdrive without replacing the transmission.
- Classic Retrofit: Offers TREMEC transmission kits and conversion components specifically engineered for classic British and European cars, competing with SST in the international classic-car transmission swap market.
Broad incumbents
- Speedway Motors: Major mail-order and e-commerce retailer of hot rod, street rod, and racing parts, serving as both a competitor (for individual drivetrain components) and an alternative purchase channel for SST's target customers.
- Holley: Large performance aftermarket platform (Holley/MSD/etc.) offering a broad portfolio of EFI, exhaust, and drivetrain products; competes with SST indirectly through bundled solutions and dealer relationships across classic and modern performance markets.
- Centerforce: Established clutch and flywheel manufacturer serving the broader performance aftermarket; competes with SST's clutch and flywheel component sales across hot rod, muscle car, and truck segments.
Others
- TREMEC: Upstream supplier of the manual transmissions SST modifies and resells; not a direct competitor but represents a key supplier relationship whose terms, direct-to-consumer moves, or OEM allocation shifts could affect SST's economics.
Emerging players
- Quick Time Bellhousings: Manufactures SFI-certified scattershields and bellhousings used in performance and racing applications, overlapping with SST's bellhousing product line and serving similar drag-racing and pro-touring customers.
- Lokar Performance Products: Manufactures performance shifters, pedals, and accessories for hot rods, classics, and trucks, directly competing with SST's STX shifter line for the same enthusiast buyer.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights6 records
Customer concentration
Silver Sport Transmissions social profiles
Digital presenceSilver Sport Transmissions financial estimates
Financial estimateRevenue estimate
Valuation estimate
Silver Sport Transmissions leadership team
Management profileNumber of profiles
Profiles1 record
Silver Sport Transmissions funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Silver Sport Transmissions M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Silver Sport Transmissions
What does Silver Sport Transmissions do?
Silver Sport Transmissions designs, engineers, and sells custom PerfectFit overdrive transmission conversion kits built around TREMEC manual and GM 4L60E automatic transmissions for installing modern drivetrains into classic American cars, trucks, and street rods. The kits bundle a modified transmission with application-specific crossmembers, hydraulic clutch systems, shifters, speedometer components, and all mounting hardware to deliver a turnkey installation with correct shifter location and driveline geometry.
Is Silver Sport Transmissions a public or private company?
Silver Sport Transmissions is a private company. It is classified as corporate owned and is currently operating.
When was Silver Sport Transmissions founded?
Silver Sport Transmissions was founded in 2014. It employs 11 to 50 people.
Where is Silver Sport Transmissions based?
Silver Sport Transmissions is headquartered in Rockford, United States, in the North America region.
How does Silver Sport Transmissions make money?
Three revenue lines are on record. Transmission Kit Sales are the primary driver. The others are individual Component Sales and technical Services.
Who are Silver Sport Transmissions's main competitors?
Direct peers on record are Modern Driveline, American Powertrain, Gear-Vendors (Underdrive Inc.) and Classic Retrofit. Broad incumbents are Speedway Motors, Holley and Centerforce. TREMEC is listed as an others. Emerging players are Quick Time Bellhousings and Lokar Performance Products.
Does Silver Sport Transmissions have an API?
No public API is recorded for Silver Sport Transmissions.
What industry is Silver Sport Transmissions in?
Silver Sport Transmissions's product category is Performance Transmission Conversion Kits. Its primary akta.pro industry code is IMACAAAG, Passenger Vehicle Transmission & Drivetrain Systems Manufacturing (ICE), with a secondary code of IMACAHAE, Transmission & Transaxle Manufacturing (Manual/Automatic/DCT/CVT). Its NAICS code is 33635 and its SIC code is 5013.