View Full Version : ID'ing rear end

07-17-2007, 02:32 PM
I just got my rolling chassis from spirit industries and I am trying to figure out what rear end I have. I know its a GM 10 bolt, either a 7.5 or 7.625. I was able to find the code on the passenger side axle tube but cant decode it. The code was BUD C090 1. Also, There is a rubber tube sticking out of the pumpkin on the passenger side, is this just a vent or is it suppose to connect to something?

I pulled the cover off and counted the teeth (11 for the pinion gear and 44 on the ring gear.) When I did the math, it is a 3.7272..... I also tried turning the drive shaft and counting the number of wheel turns, I got 10 turns of the drive shaft gave me about 5.3 turns at the wheel, which would give me a 1.8867..... ratio. I'm guessing the correct ratio is a 3.73?

Another question I have is I dont know if this is a open rear end or limited slip. There are other things inside the carrier other then 4 spider gears and a pin. I have never seen the other stuff before, any idea what the other parts are?

I am also trying to fiure out what make and year this rear came out of so I can get break parts from any parts house. Any chance the axle code would inform me of that?




07-17-2007, 03:34 PM
That looks just like what I gor from spirit It was out of an S-10 pickup I belive an 1988 model. I have some information some where.about it. Whats your e- mail address.

07-17-2007, 06:41 PM
Mic T
could you send me all the info you have please? pcoleman@ca.rr.com



07-18-2007, 05:32 AM
Headed to the Bash I will send you all I can find on Monday But I am pretty sure it is an S-!0 Its a good rear end I changed mine to a 4:10 postive trac. and have had no problems. Bash Bound and I'm out of here.

07-18-2007, 08:15 PM
You have a 3.73 gear..It's also a posi-track unit.. The rubber hose on top is the vent. That fitting is a press in and can be pry out and threaded for so you can use the nice aluminum breathers. I don't know about the codes. The S10 used many different ring gear sizes. I have a rear out of a 99 S10 4x4 Blazer and the insides looks like yours. Mine has a 3.73 Posi with a 8.5in ringgear,plus it came with disc brakes.