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Installing a TKO into a C1/C2/C3 Corvette

This conversion will utilize the C/C2/C3 GM TKO Conversion Kit  (See it here!)

You will also need our Corvette conversion slip yoke for $225.00.   I’ve had 2 customers who installed the std slip yoke in the car, but it was an incredible pain.    The Corvette conversion slip yoke is a stock replacement slip yoke that is the bolt on unit. Our strong recommendation is for you to use our conversion slip yoke for $249 ($225 with purchase of a transmission).   Otherwise, you have to figure out how to press this yoke together in the car

The trans will fit into your tunnel (C3s) without major modification.  You can use your stock bellhousing, clutch, linkages, speedometer cable, etc.

Now available! 

You will want our 2” offset shifter installed at the 19.5” location.  This will allow you to use your stock console without modification.

It is possible to use the stock shifter location centered at 19.5” (if you do not have, or do not want to purchase the 2” offset shifter).  You can make this trans and shifter work with your console, but you’ll have to do a little more work.  Here’s what Mark at Excel Autocraft (801 563-0128)  did for one of his customers with a ‘76:

    Cut 1/2” off of the shifter stub. 
    Redrill 2 new holes in the shifter.
    Build a spacer block to move the shifter bar 2 1/2” to the left, and 2 1/2” rearward.
    Lift the console 3/4” to clear the spacer block and shifter stub
    Please contact Mark for more details, and to discuss having him custom build this spacer for you.  Also notice the pics of this adapter below.

We can also provide a driveshaft, they are $220 and up.

Mark also found that the 700R4 crossmember he bought from Bowtie Overdrives was a perfect fit for this 5sp in a ‘76!   Very convenient.   Otherwise, you’re going to have to modify your crossmember to work with the 5sp.  For the welded in crossmember on the 4 speed cars, you’ll need to remove it to get this transmission in. 

It is possible to install your trans without removing the factory welded in crossmember.  However, the procedure is not for the faint-of-heart.  You will need to install the trans, bellhousing, clutch, flywheel, driveshaft, etc in REVERSE order (driveshaft, trans w/bell & fork, disc, flywheel, pressure plate, etc.  It’s been done, but isn’t much fun.

 

Mark also provided us with these pics of the TKO install into a ‘76 (Thanks Mark!)

Click on each pic below to show a larger version.

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Click to see a larger image

 

For the C2s, The TKO will not fit into the tunnel without tunnel modifications.  Also, the TKO trans mount is about 2” rearward of a Muncie trans mount, so you’d need to modify the trans mount of your X frame.

Property of Forte's Parts Connection

1. Now available!  C2/C3 bolt in replacement crossmembers!  Order your’s today!

Pic above not shown with e-brake cable pulley/bracket, but the C3 crossmember does have it.

Coming soon, how to use your stock crossmember with a TKO 5sp!

 

Convert your welded in crossmember to a “bolt in” crossmember!

Special thanks to Craig Duncan for providing the following pics and info from his ‘71.   As you can see, he chose to convert his welded in crossmember to a “bolt in”.  Pretty simple!

Click here to email Craig Duncan directly.

Notice the trans mount solution is shown below..Property of Craig Duncan

Close up of the bolt together joint.Property of Craig Duncan

Here’s where the cut in the crossmember was made for the bolt together joint.  The cut is 2” inboard from the most outboard slot in the crossmember

Property of Craig Duncan

Progress update from Craig Duncan:   Feb 6, 2005:  As you can see I used a portion of the old mount and welded it to the portion that I fabricated. Also the two holes on the side of the mount pick up existing holes on the crossmember. These holes in the crossmember are originally for some exhaust brackets but since I am running side pipes on this car, I decided to pick up these holes for some added strength. Because the body is off the car are there are no real published dimensions of where exactly the tail shaft of the transmission should be (up/down, left/right) I took measurements off of another car and set it up the same way. I will keep you updated as I finalize the mount fabrication. Keep in mind that all of the work I have done so far has been with the body off. I have been very meticulous in making sure that all of the mods I have done thus far will not interfere with the body but until I actually set it back on, I won’t really know.

Property of Craig Duncan

Property of Craig Duncan

Property of Craig Duncan

 

Here’s what the stock configuration looks like:

 

 

Thanks again Craig!

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This website is a comprehensive collection of information regarding the installation of TREMEC transmissions into various vehicles. Material contained in here may be reproduced for PERSONAL USE ONLY. No material may be redistributed in electronic or printed form without the written permission of Brad Wedan (owner). Owner believes to the best of his knowledge this information to be correct, however no warranty is made as to its accuracy. Owner also disclaims any liability for financial loss, property damage or injury in connection with use of this information. Not affiliated with, endorsed or compensated by TTC, or any sanctioning body mentioned within. Any trademarked names are property of their respective trademark holder and are used for identification purposes only. Portions of this website may be copyrighted by other individuals or organizations.

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