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Old 11-20-2012, 05:42 PM
Hellz Hellz is offline
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Join Date: Mar 2009
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Default 4L80e Tranny swap in an 03 H2

so, i have been noticing my tranny has been starting to slip a little recently, as well as some minor power loss at HW speed (70mph) when i stomp the gas to pass someone, i will get about 1/2 a sec of power loss.

so, im looking at preparing for the tranny to give out, and what the best options would be.

right now, the 4L65e tranny i dont think is a smart choice for our H2.
even if it is rebuilt to handle more HP, the cost of the rebuild would still rival the cost of just replacing it with a 4L80e. then you have the fact that the 4L65e is only a 4 spd and the 4L80e is a 6 spd... so the MPG should/will increase with the 6 spd.

so has anyone done this swap to the 6.0L engine in the H2?
what modifications were done to make it fit.. or was it a direct bolt?

how much did this project cost?
any computer/electrical issues?

thanks
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2003 Black Hummer H2 Adventure Package
4.88 gears *** Cognito UCA & SwayBar Links *** Kryptonite tie rods *** K&N CAI *** 37x12.50xR20 BFG KM2 Mud Terrain's *** 20x10 Black KMC Rockstars *** EBC Slotted Rotors *** N-FAB Sidesteps *** Line-X Grill *** Recon Smoke Cab Lights ***Diablo Predator U7193
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