what gears do i have

[pond]

hey guys i have an 01 silverado rcsb sportside.... 4.8 5-speed...wondering how i can tell if i have 3.73's or 4.10.s and if i have posi or not(i dont think i do)good ol 1 wheel peel.

thx

[pond]

yeah sorry guys.... i did some searching and found i have 3.73's...id really like to pick up a set of 4.10's... it just seems on hills and what not i always have to come out of 5th b/c its so sluggish and loses speed bad....wish the ol girl had some more torque ... any help or advice would be great

[06BLACKMAX]

At a steady 70mph cruise 3.73 will run about 2000-2100 rpm and 4.10 will be closer to the 2400-2600 rpm range. But to be sure you can jack up the rear end and make a mark on the drive shaft and the diff while lining up a mark near the bottom of your tire and the ground. Now spin the tire 10 complete revolutions while counting the # of complete revolutions the shaft makes. For a 4.10 the shaft should make 40 revolutions to the 10 reolutions of the tire, for a 3.73 it should be around 37-38 revolutions. I am pretty sure this is the correct way of doing it without opening up the diff.
Its pretty obvious you have an open diff. (no posi)

Perhaps a Nelson tune is what you are needing?

[pond]

now would a tune make that much of a difference with the 5speed? and does anyone have anyknowledge with the 5 speed( meaning can they take abuse etc.) sorry for all the question guys im just trying to find a starting point on the truck

[Shahnp1]

Considering how sluggish u said it acts pulling up hills u may be running 3.42 gear alot of the 4.8 5speed trucks came that way. I know my truck in particular came that away. You wont believe what a 93 octane tune will do for that 4.8

As far as the abuse factor I think there junk Ive destroyed mine twice first time my warranty covered it and this last time its had to come out of my own pocket which im just now able to fix. Picked up a "new to me" transmission this past weekend from 5speed02 that he had left over after his motor and trans swap

BTW I have a hypertech program in my truck which about the most run of mill generic tune u can get. If I was u I would diffinently go with a custom tune from Nelson Performance. He can create u a tune that is specifically made for your truck and mods. it may cost alittle more than buying a handheld tuner like hypertech, diablo, or whatever but trust me you cant bet the kind of work he does. the only reason i haven't got one yet is fixing broken stuff, my rides been done since Feb. 2001 . but its very high on my priorty list!!!!

[adrenalinep]

look in glove box, gt4=3:73 s and g80=posi

[pond]

yeah its gt4

[pond]

oh and would an air intake make much of a difference?

[Sleaper]

<div class='quotetop'>QUOTE(pond &#064; May 11 2007, 02&#58;28 AM) [snapback]93067[/snapback]</div>

oh and would an air intake make much of a difference?
[/b]

If by air intake you mean, STS turbo and FMIC....then yes it would make a big difference&#33;&#33;&#33;

[pond]

hahah some day i hope... until then im still looking for a reasonably priced c5 z06