6L90 Swap - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 10 (permalink) Old 09-09-2016, 05:39 PM Thread Starter
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6L90 Swap

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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09 G8 GT Pure White, Ultra Black Graphics
Kooks 1 7/8 LT's (catless), Magnaflow 3", 402 Stroker, F1A 14 psi. E-85 Built 6L80
864 whp/745 tq.

Last edited by warpig; 09-09-2016 at 09:58 PM.
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post #2 of 10 (permalink) Old 09-09-2016, 06:49 PM
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Why not name the vendor? It helps people make an informed decision when choosing a tuner or whatever it is they're looking at.
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post #3 of 10 (permalink) Old 09-09-2016, 06:50 PM Thread Starter
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6L90 Swap

It'll just get deleted. But anyway my car was at Vector for a while. Couldn't be happier with the car after right now, even though I blew through a Camaro diff last week making a PB pass. 9" going in now. It'll be in the 9's once I dial it in. Last pass was a [email protected]


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09 G8 GT Pure White, Ultra Black Graphics
Kooks 1 7/8 LT's (catless), Magnaflow 3", 402 Stroker, F1A 14 psi. E-85 Built 6L80
864 whp/745 tq.
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post #4 of 10 (permalink) Old 09-09-2016, 09:31 PM Thread Starter
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Admin feel free to delete. Initially I put this in the wrong area. Created same post in the driveline area.


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09 G8 GT Pure White, Ultra Black Graphics
Kooks 1 7/8 LT's (catless), Magnaflow 3", 402 Stroker, F1A 14 psi. E-85 Built 6L80
864 whp/745 tq.
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post #5 of 10 (permalink) Old 09-10-2016, 11:15 AM
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I will delete since you moved it. Thanks for the info. Nice work Btw.

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08' Pontiac G8 GT PBM
[email protected] Rock Falls Raceway 10-11-14
N/A RCR car.
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post #6 of 10 (permalink) Old 09-11-2016, 07:28 AM
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Good to know it can be done.

2009 G8 GT Liquid Red, red/onyx interior, VCM cold air intake, PCM of NC tune, shark fin antenna, 2016 20" Camaro SS wheels powder coated black, Chevy SS Brembo brakes, Russell stainless steel brake lines, stainless works 1 7/8" long tube headers, stainless works 3" cat back, Camaro 3.27 LSD rear diff, ADD W-1 oil catch can, B&M trans cooler, auto dim interior rear view mirror
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post #7 of 10 (permalink) Old 09-11-2016, 10:18 AM
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Do want.
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post #8 of 10 (permalink) Old 01-23-2017, 02:07 PM
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How hard was it to tune ? Similar to the 6l80e?
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post #9 of 10 (permalink) Old 01-23-2017, 02:44 PM Thread Starter
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Quote:
Originally Posted by maxspeed96ct View Post
How hard was it to tune ? Similar to the 6l80e?


Not sure Rick tunes mine. My car drives just like it did with the 80e, just more durable.


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09 G8 GT Pure White, Ultra Black Graphics
Kooks 1 7/8 LT's (catless), Magnaflow 3", 402 Stroker, F1A 14 psi. E-85 Built 6L80
864 whp/745 tq.
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post #10 of 10 (permalink) Old 01-29-2017, 11:26 PM
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What was the cost ?
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