97 Tahoe gears 5.7 vortec

[camaro1252]

I have 97 Tahoe 4wd running 35's 6" lift I have true trac locker and only 3.73 gears what would be best gears to go with I do pull trailer and I do a good bit of highway driving. I have read a lot just looking for input from people that have same setup and 5.7 vortec. Looking at 4.56 or 4.88 fastest I usually drive is like 70-75 but average bout 65-70

 

[jerryjoe28]

I run 4.56s with the exact same set up

gives me plenty of low end power and the rpms are very reasonable on the interstate

 

[camaro1252]

What kind of rpms you turning say 65-70 mph. Not that I'm trying to spin my nitto trail grapplers but does it seem to have power to spin them on highway. Mine does ok with 3.73 but gas mileage sucks

 

[jerryjoe28]

lol if u want better mpgs better sell that thing..... I think highway rpms are right around 2k but im not positive. I know it is much better than my stock 3.4x gears. the take off power is night and day!

 

[camaro1252]

Not worried bout mpg just wondered what u was getting. Just torn between 4.88 or 4.56

 

[jerryjoe28]

I have literally never checked my MPGS after the lift... I would rather not know lol

 

[camaro1252]

Anyone else running either of the gear setups thanks for input

 

[Dneel81]

I'm running 3.73s with 37" tires. I'm at 2000 rpm at 72 MPH. 15mpg with the NV4500 OD at 0.73 I believe. I just found out about this yesterday when I changed the gear oil and counted the teeth. I would have sworn I had at least 4.11s in the truck but no. Previous owner didn't think to change the gears when he put the tires on.