demetri

I was looking at this site and this is what I found.

http://emporium.markwilliams.com/pro...sp?prodid=3227

i want 3.42 gears. if this will not work tell me something that will please

kretos

it'll work from what i can tell, you do have a 10 bolt correct?

demetri

i Dont know how do i check??

Jade Grey

iTrader: (1)

No, it will not work. You most likely have a 7.5" 10-bolt rear end. The 8.5" 10-bolts were used on 2nd Gen F-body's.

demetri

they dont have it on that site. where could i buy something like that from? plus how do i check because i want to get the right rearend

Jade Grey

iTrader: (1)

www.gearsareus.com sells Eaton posi units for the 7.5" 10-bolts. Their prices are comptetive too.

Edit: Simple way to check is to count the cover bolts.

demetri

its a 10 bolt but how i check the inches or whatever?

Jade Grey

iTrader: (1)

Well, you could remove the cover and physically measure the ring, but that would be a waste of time.

You have a 7.5" (sometimes seen as 7.625") 10-bolt rear end.

demetri

thx i also found this http://www.moserengineering.com/mose...s.asp?CatID=24


also what about spline?

demetri

what does my camaro have 26 or 28 spline?

Benm109

Your 91 has 28 spline axles.

demetri

Are you sure? Because i cant find any eaton posi's with a 28 spline

Benm109

Unless one of the previous owners swapped out the rear end. 82-88 F-Bodies got 26 spline 10-bolts, 89 was the changeover year, and 90-92 F-Bodies got 28 spline 10-bolts.

Eaton makes LSDs for 28 spline 10-bolts, look at the second application on their website: http://www.traction.eaton.com/prod5.htm

demetri

No I am the real owner, but that would mean that I have a 7.625" ????

19599-010 part number

Jade Grey

iTrader: (1)

Yes that's the part you want, and reread my last post. I mentioned the 7.625" measure already.

The ring gears are the same size, the method used to measure them was changed. At least, that's what I have be told.

demetri

Ok thanks guys, I found one for 420 plus shipping.

Pro Built Automatics

Go to https://www.justdifferentials.com/st...cat=172&page=1 they are $359.00, plus shipping.

Jade Grey

iTrader: (1)

Hey Probuilt, how are you affiliated with www.justdifferentials.com? I see on the footer of the website that it's sponsored by you. I'm just curious.

Pro Built Automatics

I am the owner.

demetri

thats cool, guess you cant give me a 2% discount on that posi eh? lol

wicked1

I have an 89 Trans Am GTA 5 Speed ..... Was told it has a stock 3.45 gear in the rear end. Can u tell me if its a 7.5 " 10 bolt rear end? And if its 26 or 28 spline? I saw u said it was a "changeover" year ... I am looking to put a 373 gear in it, as I am swapping out the motor to a 355 300 horse this week... Any info would be helpful ... Also if the gears will just fit right in or if I have to change the carrier.... Thank you! Scott

Jade Grey

iTrader: (1)

If yor car has 3.45 gears in it, then you have a Borg-Warner 9-bolt rear end. Quite a lot of '89 GTA's received that rear end from the factory.

wicked1

So is the Borg Warner rear end better than the others or worse ? What else do u know about it?

Jade Grey

iTrader: (1)

There's plenty of information about the BW 9-bolt on this site if you care to search.

The 9-bolt is considered stronger than the 10-bolt rear end. The 9-bolt does not use c-clips for axle retention. The 9-bolt uses 4, not 2, spider gears in the posi carrier. I believe 1989 was the last year they were used in the F-body.

The bad part about the 9-bolt is the scarcity of parts. It's essentially an Australian rear end. Check out http://www.9bolt.com. I believe a TGO member runs that site.