4L60E vs. 4L80E (1 Viewer)

[mwalls54]

i just looked up one of the old logs i made before i tuned. its a 2004 2500HD with 6.0 and 4l80e and 3.73 gears. 1st gear shifted at 53mph at 5200 rpm. after i tuned it shifted at 60mph and 6000 rpm.

 

[UglyFJ60]

all I know about it is the 4L80e stands up to the 454 in my 91 2500 Suburban. I am not exactly nice to it and it has 207,xxx miles on it. you won't notice the 5% difference in the OD (4L80e = 25% over driven, 4L60e = 30% over driven) and actually the 5% less overdrive is a benefit to keeping the tranny cooler. with lower gears you wont notice the taller 1st gear either.

what you will notice is the 4L80e weighs more than a pregnant elephant and sucks up alot of torque.

 

[chicago]

Ill be following CLOSELY the poineers here on mud for what they have done in their installs to try and make it smog legal even though I currently do not have to smog.
Im reading these posts carfully.
Does anyone know if earlier model trannies (96 and up) will work with a later model (99-01) engine, and is there a difference between V8 and V6 cyl trannies?

Chicago

 

[chicago]

I am running a built 4l65e in my silverado ss and i have 600hp at the crank. I have broke input and output shafts on stock trannys, In my built tranny i have everything upgraded internally. Have you already bought a tranny? if you have one rebuilt i would go with upgraded cluches and shift kit and it will be fine.

Thanks,
did you do the work, or have a shop do it?
If it was done at a shop, about how much did that run?
Im finding the trannies pretty cheap, but they do have 80K+ on em.

Chicago