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GM Chevy Chevrolet Buick GMC Pontiac
Mopar Dodge Plymouth Chrysler
American Motors Corporation
TREMEC Overdrive Transmission Kits

Overdrive Transmission Kits

Crate Engines

Crate Engines

Spraker Rear Axle Assemblies

Rear Axle Assemblies

Recommended Parts

Tremec 6-Speed Reverse Lockout Control Module

The Reverse Lockout Control Module restores functionality of the Reverse Lockout Solenoid on classic cars. *Requires the optional connectors below if you don't already have them. Read More

GM 621 Reproduction Bellhousing

Having a hard time locating a good Chevy 621 bellhousing that doesn't have stripped threads or cracks? Look no further because Silver Sport Transmissions produces its own version of the 621 bellhousing. This new bellhousing is cast from thick wall titanium aluminum alloy, CNC machined to provide precise location of mounting and dowel pin holes, and the center bore that locates the gearbox. Read More

Silver Sport Transmissions PerfectFit™ Hydraulics Kit

The Silver Sport Transmissions Hydraulic kit is the OEM style, proprietary design release bearing. It’s rated at 7000 rpms, has a forged aluminum housing, silicone dust boot , piston wiper seals and a 1,000,000 cycle service life. This bearing is well suited for everyday use. Read More


The overdrive transmission kit that everyone loves

Silver Sport Transmissions modifies Tremec 5 and 6 speed transmissions to retrofit into your classic car, truck or street rod and includes any parts and accessories required to install them. Our PerfectFit™ Kits are made to last with only the highest grade parts included in our kits and all of our transmissions are quality tested for leaks, noise, and performance. No one else performs all the testing we do.

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Latest News


Michael Medero documented his installation of a TREMEC TKO PerfectFit™ Kit into his Chevelle.

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Rocks or thunder

Sometimes, the numerous rotating parts in your car can sound less like the thunder of the gods and more like a dump truck with a load of gravel on a bumpy road. What can you do to fix it?

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1974 6-Speed Corvette TREMEC

John's 1974 Corvette is perfect! With a 6-speed, he'll be cruising in double overdrive!

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Custom shifter for a TREMEC TKO or Magnum

We had a customer who needed a right hand drive transmission and we were happy to accomidate. We can build a custom TREMEC TKO or Magnum for you too!

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Upcoming Shows

Carlisle Chrysler Nationals

Join Silver Sport Transmissions and over 2,500 vehicles from all eras of the Chrysler brand, classics, muscle cars, high-performance new models all converge on Carlisle for a one of a kind weekend. 

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Mopar Nationals

We'll be in Columbus, Ohio for the Nats! Several cars with our transmission kits will be on display.

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Corvettes at Carlisle

Come join Silver Sport Transmissions at the largest and most fun-filled Corvette event in the world. The annual Corvettes at Carlisle event features more than 5,000 Corvettes representing all generations of America’s classic sports car. 

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Holley LS Fest

Silver Sport Transmissions will travel to Bowling Green, KY for the Holley LS Fest September 7-10th. The Holley LS Fest is the celebration of everything and anything powered by the GM LS engine. 

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