Transmissions and Drivetrain Need help with your trans? Problems with your axle?

Want 3.73's...what are my choices?

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Old Sep 27, 2004 | 10:12 AM
  #1  
BIGJON's Avatar
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Car: 1989 Formula 350 Firebird
Engine: 350
Transmission: 700 R4
Want 3.73's...what are my choices?

I have been using the search for awhile now and haven’t really crossed an answer to my question….I am wondering what I should look for as far as what gears I can get…..when I changed my diff. fluid I noticed a tab that said I had a Borg Warner 3.27 diff. I know it’s a limited slip differential….anyways I am looking for in the area of 3.73 gears….what are my options as far as searching for applicable gears….I know it’s a 9 bolt….how about diameters, etc…..thanks in advance for replies…
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Old Sep 27, 2004 | 10:16 AM
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From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
There is only one diameter that will fit; it's the ones for a 9-bolt. 7.75". So don't worry about that any further. Either the gears are for the 9-bolt, or they're not.

Your options are extremely limited and they're not cheap.

Randy's R&P has some I think, and Drive Train Specialists I know does. http://www.drivetrainspecialists.com...s.php?catid=29
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Old Sep 27, 2004 | 10:27 AM
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Car: 1989 Formula 350 Firebird
Engine: 350
Transmission: 700 R4
I wondered.....I had a feeling that was gonna happen....I figured that there would be more to choose from but thanks....guess that will have to do....thanks RB
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Old Sep 27, 2004 | 10:34 AM
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Car: 1989 Formula 350 Firebird
Engine: 350
Transmission: 700 R4
Check this out....Drivetrain Specialists has an EBAY page too.....seems that the price is better too....what else would I need for these to be installed?

http://cgi.ebay.com/ebaymotors/ws/eB...spagename=WDVW

Well what would you suggest......should I upgrade my 9-bolt or look for a different axle assembly......thnx

Last edited by BIGJON; Sep 27, 2004 at 11:58 AM.
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Old Sep 27, 2004 | 12:00 PM
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Car: 1989 Formula 350 Firebird
Engine: 350
Transmission: 700 R4
And another thing...has anybody had good experiances with Randy's R&P?
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Old Sep 27, 2004 | 12:13 PM
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From: Loveland, OH, US
Car: 4
Engine: 6
Transmission: 5
That ebay page is not the same company as the one I posted; and the gears on the page are for 7½" 10-bolt, not 9-bolt. So they're not the right thing.

I've never done business with those people on ebay. But I will say, I personally prefer to know who made my gears, and where; I don't want gears from China or India or Thailand, made by who knows who. I'd much rather have Dana or Richmond or Superior or Precision or GM Motive (AA&M) or US Gear (Strange). Instinct tells me that "Drivetrain Specialist brand" gears don't come from any of those sources.
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Old Sep 27, 2004 | 12:16 PM
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Car: 1989 Formula 350 Firebird
Engine: 350
Transmission: 700 R4
Ok I agree with you on that... I was looking for Richmonds until I noticed that they didn't make any for the 9-bolts....

I still am unsure of what to do.....build this 9-bolt or find a 10 bolt and build it....
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