The tall 1st gear and weight are the only reasons I haven't done the 80e swap. I am confident it will slow me down where I play, speed wise, the most. I have 4.10's. Wish I had done 4.56 when I swapped. I won't do it again unless something breaks. I'd like to go the 4l80E RV 1st gear thats available.

 

Yeah, I'd probably enjoy the 4.56's more. I was just so scared of killing highway use on them. I'd like the 1st gear mod too. DO IT!

 

I read up on the 1st gear swap when I did it(went to the 80E). I think Vince@ FLT said he was afraid the different gear set would become the weak link in the 80E. I'm not sure if he has chaned his stand. Has it been done a few times yet? Does FLT offer this gear? Since I'm 2WD it might be easier and cheaper just to swap to 4.56
I bought the GTO for a DD and I wasnt going to mod it....BWAHAHAHAHAHAHA!!!

 

The tall 1st gear isn't bad at all... and I have 3.73's All depends on how you stall it along with matching how YOU want your forced induction to hit. I am VERY happy with my 4L80E.

Bill

 

x2...I'm very happy with mine as well. I have 3.73's with 33" diameter tires and a stock replacement converter that has excellent street manners but will brake stall to 3200 when I want it to

I was considering doing the 1-2 gear swap for awhile, but I'm glad I didn't, although I think the stock 1-2 80E gears work better with turbo trucks than with s/c trucks.