4L80e Tranny swap in an 03 H2

[blindellh2]

Originally Posted by Hellz

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.

I agree with you on a 4L80 swap and am very interested myself for the near future.
But a 4L80 is a 4 speed trans. (4 stands for 4 speed, L for longitinutal and 80 for 80% duty)

[Hellz]

you are correct...

for some reason i was thinking that the 2008+ H2's ahd the 4L80 in them, but actually they have the 6L80.

that is what i was essentially thinking. getting a tranny from a newer H2 and throwing it in my 03.

i just want the 6sp for the extra MPG and ability to take more HP. i dont plan on doing a SC/TC or anything like that. mostly bolt on stuff.. but when this engine finally goes, would like to throw a big block in there and have it connect to the drivetrain without any serious issues. big block as in a 427 or a 454... atleast i will have an excuse for ****ty MPG after that

[[__--MUD--__]]

You will spend atleast double what a 4l80 will run you to get that 6 speed tranny in the truck and functioning correctly. Its completely different clutch design. There is all kinds of extra **** needed beyond what a 4l80 requires to operate. The 4l80 is just a drop in. 4l80 gearing is comparable to gears 2,3,5,6 in the 6-speed. 4l80 has a taller final gear to.

[glennf1]

And it's electronically controlled so the computer would need to be modified/flashed/upgraded.

[[__--MUD--__]]

They're all electronically controlled