Trans detent shims Tremec T56 TR6060 Camaro Challenger GT500 Viper AntiVenom Mod
*** This is a very popular mod that many do to reduce shifter effort after installing an aftermarket shifter that is too aggressive, originally known as the "anti-venom mod". ***
Shim kit for T-56 horizontal detent / TR-6060 lateral bias in listed applications w/ 6 speed manual trans:
- 2004-2015 Cadillac CTS-V
1993-2002 Camaro - V8 only
- 2010+ Camaro - V8 only
- 2005-2006 Chevy SSR truck
- 2014-2016 Chevrolet SS
- 1992-2017 Dodge Viper
- 2004-2006 Dodge Ram SRT-10
2009+ Dodge Challenger - V8 only
- 2004+ Ford Falcon & FPV (Australian)
- 2000 Mustang Cobra R
- 2003-2004 Mustang Cobra
- 2007-2014 Mustang Shelby GT500
- 1998+ Holden Commodore (Australian)
- 2001-2006 Holden Monaro (Australian)
1993-2002 Pontiac Firebird - V8 only
- 2004-2006 Pontiac GTO
- 2009 Pontiac G8 GXP
- Magnum & XL Tremec aftermarket transmissions
Includes 2 aluminum shimming washers & instructions
- These washers are difficult to find locally - save time & hassle!
- Option of using one or both washers (stacked) to adjust effort
- Requires lifting car off ground & working in a tight space with basic hand tools, but nothing else gets removed during the process & components are above fluid level
Background info (function of component altered by these shims varies by transmission model):
- T56 except CTS-V: This is the horizontal detent spring, which provides a load that must be overcome to shift fore/ aft into gear. It also defines a crisp horizontal neutral line for the shifter to follow laterally across the shift pattern without interference from the guide plate, and filters the transmittance of synchronizer engagement to the shifter. It is a spring-loaded device engineered for use with the stock shifter; with the reduced leverage of an aftermarket shifter, the force (at knob) needed to overcome this detent increases, making it more difficult to shift fore/aft into gears. By shimming this detent outward slightly, the force can be reduced back to a reasonable level. Two stacked washers (~1/8") is the most one should install as this detent must still make contact to perform its function.
- All TR6060 + CTS-V T56: This is the lateral bias spring, which causes the side-to-side spring force you feel in the shifter. On T56, this was in the shifter base, but got moved internally to accommodate cantilevered remote shifters. To accomplish this, the horizontal detent previously located on the central lug is moved to the front of the case and combined with the gear detents previously defined by the guide plate under the lug; this detent is very difficult to alter. However the lateral bias now defined on the central lug is the first place to look for improvement anyway. With the reduced leverage of an aftermarket shifter, the force (at knob) needed to squeeze this spring increases, making it more difficult to access the off-center gates. By shimming this detent outward slightly, the force can be reduced back to a reasonable level. Two stacked washers (~1/8") is the most one should install as this component must still make contact to perform its function.
We also sell a softer spring for the reverse lockout, to reduce effort to enter the reverse gate - see separate listing!
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