I recently had the conversion completed and thought I would share my experience. In the past I've had bad experiences with the 6L80, went through 4 of them in a matter of just over 2 years. Mostly was due to bad tuning!

When the last 80e went down I was at some cross roads. Nearly had a TH400 built for the car, now looking back I'm very happy I didn't. I was fortunate enough that Tim King had a core in his shop from a ZL1. I figured I'd give it one last try with the 6 speed.

Couple small notes, you'll need a custom cross member, and also need to cut and rebalance your drive shaft 1 3/8" shorter. I already had an aluminum 1 piece which made it easy. Not sure how it would work with the OEM shaft though.

I highly recommend Tim King as a trans builder, great guy and awesome turn around. Also now all my tuning is being done by Rick Crawford. Due to the combination of Tim and Rick, this is truly the best trans I've ever had in this car!

Here's a few pics of the swap and comparison pics between the 80e and 90e.


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