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Installing a TKO into a 1968-72 GM A-Body

For my detailed write-up of installing a TKO into a ‘69 Chevelle, please read my article hosted by Team Chevelle (click here).

The TH350 Crossmember can be used with the TKO without modification.  I modified mine, but have since made some changes that wouldn’t have required the mods.  See some pictures below.

We also have 68-72 Chevelle 5sp console inserts!  $ each, and more pics on this page (click here) 


Especially if you have an original automatic transmission car, you will most likely require some tunnel surgery for this transmission, meaning that you will have to "lift" the tunnel.  Here’s a couple of solutions (click here).   Also note the pics in the article linked above.  Yes, you probably WILL have to modify your tunnel in a similar manner to get it installed (regardless of what someone else tells you).  The tunnel on your car is simply too small to accomodate this large trans.  And do not lower the tailshaft to get the trans to “fit”.  Here’s why (click here).

The parts you need for this conversion are listed on the “GM Conversion Package” page.

The centered shifter that comes with the TKO-500 & TKO-600 will work fine with your console.  There is no need for the 2” offset shifter.  Here’s a bit more info: ‘64-’72 GM Shifter (stock) Tech.

Pontiac LeMans:

Everything is pretty much the same as above for your car.  If you have a LeMans and want to convert from an automatic to a 4sp, Old Car Network has the clutch pedal and linkage kit that you need! 

    Everything from the Chevelle conversion kit will fit the Pontiac A-Body
    cars, except for the bellcrank. So, you would need:

    SP062  1968-72 Floor Shifter Conversion Kit (4-speed) - Chevelle / El Camino


    KR00587  1968-72 Z-Bar (Bellcrank) - GTO / Tempest / LeMans

Give John at Old Car Network a call, and tell him we sent you.

Here’s 70 GTO console with Forte’s 2” offset shifter @ 16.75” :

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These pictures are under a ‘69 Chevelle SS.  You can see the crossmember was used without modification.  You will have to redrill a couple of holes in the frame for the outer crossmember bolts.

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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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