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Go Back   Hummer Forums by Elcova > Hummer H2 Discussion Forums > Technical Discussion and Customizing your H2

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  #1  
Old 02-27-2008, 01:40 PM
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Default Re: S/C installed now I have shifting problems!!!

Quote:
Originally Posted by Rhyno
I'm taking it to AAMCO tomorrow but would like as much info as posible.

Can't offer much advice other than to say that if I was having tranny problems after a supercharger installation, the absolute last place I would take it is AAMCO. That's like taking a Ferrari to Walmart for an oil change.
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  #2  
Old 02-27-2008, 02:11 PM
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Default Re: S/C installed now I have shifting problems!!!

Tuning issue is what I would guess, I would find a reputable shop in your area that tunes vehicles (any shop that tunes F-Body's, Corvettes etc...) on a chassis dyno. You will not be able to get on the dyno with your rig but a competent tuner using software such as HP Tuners should be able to play with your shift points and rev limiter to eliminate this problem.
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  #3  
Old 02-27-2008, 02:13 PM
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Default Re: S/C installed now I have shifting problems!!!

Quote:
Originally Posted by TXSUT
Can't offer much advice other than to say that if I was having tranny problems after a supercharger installation, the absolute last place I would take it is AAMCO. That's like taking a Ferrari to Walmart for an oil change.

I agree 100%..... stay the hell away from AAMCO, you will be sorry you even walked through the door.
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2008 H2 SUV Luxury: Solar Flare ext/Black int

SOLD 2006 H2 SUV Luxury: Pewter ext/Black int.

2002 Corvette Z06 Blue/Ebony (light mods)
1/4 mile: 11.661@118.86

2013 Audi S4

2002 Yamaha YZF R1 Blue/White
1/4 mile: 10.51@136

2006 Sea-Doo RXP (70.6mph GPS)
2005 Sea-Doo RXT
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  #4  
Old 02-27-2008, 04:38 PM
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Default Re: S/C installed now I have shifting problems!!!

from my experiance, you will have to rebuild the whole trans with better parts.

i went thru 3 trans after my SC install. but got it right after i found some one to rebuild with all of the best parts they could find for the trans.

it only cost around 1200 for the rebuild and i have pounded on the trans for the last 25000 miles and no problems
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  #5  
Old 02-27-2008, 05:47 PM
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Default Re: S/C installed now I have shifting problems!!!

Have you tried to use the programmer that came with the S.C. and reinstall your settings??
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  #6  
Old 02-27-2008, 05:56 PM
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Default Re: S/C installed now I have shifting problems!!!

I have the Mag charger and I'm running 8lbs of boost. I am hard on my tranny but have never had a problem. Sounds like a tuning issue to me...
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  #7  
Old 02-27-2008, 06:25 PM
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Default Re: S/C installed now I have shifting problems!!!

Got an update, 2nd gear is gone! The shop said that the Band has broken for second gear. They are going to have to open up the tranny to see how bad it is. Good news is that the tranny fluid is still red.
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  #8  
Old 02-28-2008, 04:43 AM
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Default Re: S/C installed now I have shifting problems!!!

It would be in your best interest to find someone to build your transmission to handle the added power, in my experience the stock trans does not hold up unless you drive it easy. Basically you have upgraded to a performace engine and have it mated to a stock transmission making that your weak link(pretty expensive weak link). How many race cars ya see running a stock transmission?
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