3.45 i took it out of my 89 which now only has 17,700 miles on it.I plan on putting it back in in a couple of weeks.But i do have a 10 bolt out of a 91 avail.

 

Sorry 10 bolt with 3.42

 

I thought I got lucky once and I got a 3.45 9 bolt from a G-92 87 Bird. I brought it home only to find out that the posi and ring and pinion gears were all bad. It was a 3.45 though. I paid 200 for it and when I told the guy what happened he offered to give me my money back or give me 100 back and I keep the rear. That is what I did and I now have a posi 3.73 9 bolt.

 

So how much did the gears and posi set you back? I know they're pricey but I dunno HOW pricey...

 

I have about 700 in mine precision 373s, install kit , used 3 series posi(75 bucks) and pro install (200 bucks)

 

That is a good price for that 9-Bolt, good deal. Now all those people who complain about 9-bolt prices, let them price a Moser or a 9" Ford for about $2500 without brakes. Or better yet let them run their 10-bolts. Its just that GM's bean counters got rid the best Rear Axle on the 3rd Gen cars.

 

I have about 850 in mine. I bought a new 3 series carrier, new 3.73 gears, new install kit, new axle bearings, oil and 100 for a friend at a pro shop to set it up for me.