I have 2000 gmc rcsb 2wd 4.8 anyone know what gears came in this thing stock? thinking about swapping them out to help this thing get out of its own way when i mash the gas and its my DD any input?

 

It's in the glove bOxes.. I don't remember how to tell thou

 

GU6 3:42
GT4 3:73
GT5 4:10
Most likely a 3:42 those seem to be pretty standard for that year range but double check the little code sheet in the glove box.

 

Hey thanks guys..what would be a good swap?

 

depends on what you have and your overall goals.

 

These are all the axle codes

GU4 -- AXLE REAR, 3.08 RATIO
GU5 -- AXLE REAR, 3.23 RATIO
GU6 -- AXLE REAR, 3.42 RATIO
GT4 -- AXLE REAR, 3.73 RATIO
GT5 -- AXLE REAR, 4.10 RATIO
G80 -- AXLE REAR, LIMITED SLIP DIFFERENTIAL (POSITRACTION)
G86 -- AXLE REAR, ELECTRONIC LOCKING DIFFERENTIAL

 

well initially i was just going to leave it stock but i just caint lol i have had several people say do the gear swap first. im also thinking of a boosting 4.8 or the infamous 6.0 swap not sure where to go on that either. im totally new to the make your truck go fast thing and not sure where to start..it will be my DD but i want it to sound serious and run just as good i dont need to break any land speed records but a fun day at the track and then drive it home would be cool.

 

Hey thanks brick

 

Mine is a GT4/G80. I'm fairly sure I'll keep the 3.73's and just get a value trac to go with it. I've heard it's not a noticeable difference between 3.73's and 4.10's.

 

Like 1 Fast Brick said. Depends ultimately on what your goal is. I agree there's very little difference between 3.73 and 4.10. I have 2 sets of 3.73's that just came out of my COPO 2000 Silverado to make room for 4.56's. It also had the G80 locker from the factory. Gears can be had at a reasonable price if you decide your're interested.
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