I bought a car yesterday and it came with an extra rear in the back. The case has GM #22522678 If someone could help id appreciate it.. THANKS GUYS

 

Sounds vaguely familiar; like it could possibly be the casting # for the center housing section of a F-body 10-bolt.

Does it have 10 bolts?

Does it have a torque arm mount?

Those are easier ways to identify it than that casting #.

 

I apologize. The rear is from a thirdgen. I just wanted to know what the gear and all was without panning it. It dont have a tag on the cover like there should be i didnt know if i could tell with out removing the tag. OR CAN I . thanks and agian i apologize

 

No; the chunk of cast iron keeps the same part # regardless of what gears happen to be inside it at the moment.

Only way to tell for sure is to take off the cover and look. You'd be doing that ANYWAY, if you were going to use it, to change the fluid; just go ahead and do it now.

 

ok thanks man. I didnt plan on using it i bought a parts car and im just selling all the rest. I was just trying to get an idea so that way i didnt have to so i could sell it, but guess i will, Im lazy lol... i already have 2 camaro project cars tearing anothere rear apart is just agrurvating

thanks again...later

 

On the front of the passenger side tube closer to the center section, there will be some numbers stamped into the tube. They are usually very hard to read. Those can tell you what the original diff came from and had in it.

The tube probably needs to be really clean to read the numbers.

 

ok. i havent completely scraped all the gunk off yet but do you have a good site i could check up on the numbers or will our THIRDGEN rpo decoder work... thanks

 

You're not looking for RPO codes, you're looking for axle codes

 

its really a LOT easier to just pull of the cover, count the teeth and see if its open or posi. No scraping off crap and hoping the tube is not all rust slake and the numbers are long gone anyway. Even with all that work there is still no way to tell what gears or carrier may have found their way in to the housing over the last 20 odd years. just pull the cover, just takes a coupe minutes

 

Really.... it's too easy.

I just don't understand why people seem to think this is so hard or something? What am I missing? I can pull one of those covers in less time than it takes to post yet another "what gears do I have" post, and then fill the rear back up and put the cover back on in less time than it takes to post yet another post making yet more excuses about how it's so hard. And I'm a fairly fast typist, but I can still do the cover thing faster. I just don't see what the big deal is?

 

yet another person to say something about my question. it was a simple yay or ney. i just have two rear ends and i dont want to mess with them... geeze

 

i appoligize if i beat around the bush with my responce

with the casting # and info you gave me, I cant help you further, the only way you will ever know what is in the rear is to open it.

 

FWIW On any factory GM ring gear(have to remove the cover though) I have seen yet, it will have a series of numbers on the flat portion of the outer 'ring' on the ring gear. You will be looking for a two digit/two digit number such as 13:42. You simply take the bigger number and divide it by the smaller number. In this case 42 divided by 13 comes out to 3.230769, which would mean 3.23 gear ratio. That is alot easier than counting the teeth. HTH

 

thats what i used to do was count, didnt know that though. i was just wanting an easier way for future reference.. thanks to those who have positie answers.