My 01 Yukon-XL 4X4 has Factory 4:11 it turns 2250 at 70 MPH
I also have the 5.3 in it.
It is my DD I am getting 15.67 MPG it also part time 4X4.
I feel it good for cruising not enough motor for towing I could put 4:56 then again I think it be turning around 2500 at 70 MPH not good for a DD good for weekend car fun car it should work fine or just for towing.
If you planning to go with a 4L80E trans go with the 4:56 do to the higher first gear it the trans 3:07 in the 4L60E 2:67 I think in the 4L80E and the over drive in the 60E .70 compare to the 80E is .65.
If you going to tow even think about 4:88's with the 4L80 trans.
And also figure in you're tire size before what gears you're going to buy taller tire you need deeper gear's to make up for the over all increase in the tire OD plus the speedo will be off.
If you go to a smaller OD tire it will act like you put deeper gears like 4:11 or 4:56 you're speedo might say you're doing 70 MPH but you only doing 65 MPH once again you need to get a tuner to fix this take to a shop to re-flash the computer or have a custom tune done.
---------- Post added at 03:38 PM ---------- Previous post was at 03:32 PM ----------
If you planning to be turning 3000 -3200 RPM'S during normal driving you are you building a new motor for this with a BIG cam set up long runner heads forge crank big injectors ect. you going to need a trans that will hold up with this and a high Stall convertor.
3000-3200 that's a lot rev's for a street car.
I am looking to get some rear end gears for my tahoe before I do the cam that I want. Where are you guys ordering your gears? Im torn between 3:73 and 3:90. I plan to run about 3000-3200 eventually.
I have a 2006 Tahoe LT and the guy at Summit Racing is telling me that with my rear ABS, the gears they sell wont work?? Where can I order the gears and installation kit?
