The following installation notes are a summary only.
For more detailed installation information, call us at 760-438-2244.
- Tunnel fitment. The TKO fits within the tunnel of a C4 Corvette. The only modification that is required is to cut out the “shifter box” to allow the TKO side-mount shifter to protrude through the floor board. Each Classic Motorsports Group kit includes a replacement tunnel patch and detailed instructions for this modification.
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“Shifter box” modification |
Shifter box cut out |
- Shifter location. With our custom side-mount shifter the shift stick will fit within your stock center console without any modifications.
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1985 Corvette – TKO installed with stock console |
- Torque arm bracket and transmission mounting. You will need to use our custom torque arm bracket too support the tailshaft of the TKO to the stock C4 torque arm. Minor modifications need to be made to the torque arm bracket (two new holes need to be drilled and a small notch needs to be cut.
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Torque arm modifications |
- Bellhousing & clutch linkage. Your stock hydraulic clutch linkage and bellhousing will work with the TKO.
- Driveshaft. Your stock driveshaft is the correct length for use with the TKO. You will need to replace your transmission yoke with a 31 spline yoke. A new 31 spline Spicer slip yoke is included with each kit.
- Speedometer. You will need to use an electronic speedometer interface unit to allow the TKO to “communicate” with your stock speedometer. Each kit includes a speedometer interface unit as well as detailed instructions to properly install it.
- Clutch components. Your stock clutch disc and pressure plate will work with the TKO.
Select Your Ultimate Fit
Conversion Kit
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A popular option for
4-speed to 5-speed conversions. |
We are confident that installing a Tremec overdrive transmission will be one of the best improvements that you can make to your Classic Chevy and your driving experience will increase greatly because of it. With this in mind, it is also important to understand that anytime you install non-stock parts, of any type, in your car, it is possible that things will not go exactly as planned and that some minor modifications may be required to your car or to the kit parts in order to achieve proper fitment. Because of slight variations on the production line when your car was built, past modifications to your car by previous owners, past accidents that your car may have been involved in, and after 30+ years of time on the road, each car is slightly different or unique in its own way.
We have made every attempt to make our TKO kits in such a way that only minimal modifications are required and for majority of installations this is the case. However, it is important that you proceed with your installation knowing that, while not likely, some modifications other than those that have already been clearly stated, may be required.
While we are confident that you will be extremely happy with your new TKO overdrive transmission, it is important that you understand the potential realities with this install before you make your purchase rather than have you find out after the fact. Please proceed with your TKO kit purchase with this in mind.