Hey guys i was curious if any of u can help me out, i have a 87 trans am with a 305 4bbl carb and a 700r4 it has a 2:73 gear ratio and ITS NOT A POSI,

Does Any One Know The how many splines these axles have????


Thanks In Advance

 

If it's original and a 10 bolt, 26.

Unfortunatly though, there's no way to tell for sure without pulling one out and counting.

 

It is a 10 bolt and its all original thanks for the help.
tomorow iam going to be taking apart just wanted to kno a lil b4 i did thanks again
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GMGOD by any chance would you kno if i can take out the posi unit (with the ring pinion and etc.) from my 8 bolt rear and put it into the 10 bolt rear end i have right now Thanks

 

If your talking about a 9-bolt. No, you can't.

 

sry type wrong number its 9 bolt borg warner,

can i take the disc brakes from the 9bolt and put it one the 10bolt with drums i got everything off the 9bolt

 

No.

The flange where the backing plates mount to the axle tube is different.

But, 10-bolt backing plates are easy to find. And, if your 9-bolt ones are for the good brakes (PBRs), people will pay good money for them. Most everybody that has the crappy Saginaw system would LOVE to trade up to the PBRs, but those plates are somewhat scarce, being a 1 year only deal (89).

If you have the Saginaw system, you'd be better off leaving what you have on there; and keep looking for PBRs.

 

how can i tell if the brakes are PBR's or Saginam, Thanks Alot for all the help guys

 

PBR: aluminum, 89-up, both calipers mount behind the axles

Saginaw: cast iron, 88-back, one caliper mounts in front of the axle and the other behind

Pretty easy to tell apart, really.