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Installing a TKO into a ‘88 Cutlass (78’88 A/G-body)

This conversion will utilize the GM TKO 5sp. 

This transmission will not fit into your tunnel without modifying the tunnel.  You will have to “lift” the tunnel.  For an example, see here:  Tunnel surgery

You’ll also need to modify your crossmember, and shorten your driveshaft, and install the C6 slip yoke onto your driveshaft.  And I really can’t yet address where the shifter will come up.  I can tell you that the stock rearward shifter locaiton is centered in the tunnel, and is 19.5” from the front face of the trans.  We also have some custom shifters available, see the custom shifters here.

We also sell the clutch pedal and linkages for $.  That includes 1 clutch pedal, linkages, pivot ball clips, adjusting rod, etc.   You will need to modify your existing brake pedal mount to allow this clutch pedal to mount in tandem with the brake pedal.

A steel bellhousing for an Olds 455 is $.  And the Lakewood steel bellhousing (15050) for the GM application is $ .  This is actually the bellhousing for a Chevy II, but no one makes an original replacement bell.  The Chevy II bellhousing’s fork comes out a bit lower, but it will work fine with the G-Body linkages.

Here’s a couple of links to check out:   (T5 installation, clutch pedals will apply)  - Custom made crossmembers!


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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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