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Old 08-26-2009, 06:40 PM   #1
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2.73 Rear to 3.73 Rear
What else do i need to upgrade on my 1990 Pontiac Firebird EFI 5.0 305, to make this work properly
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Old 08-26-2009, 10:41 PM   #2
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Re: 2.73 Rear to 3.73 Rear
The gear in the tansmission will need to be changed to keep the speedometer accurate.
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Old 08-27-2009, 04:53 AM   #3
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Re: 2.73 Rear to 3.73 Rear
so, would that be a ring and pinion gear like this ...

http://cgi.ebay.com/ebaymotors/GM-7-...Q5fAccessories
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Old 08-27-2009, 05:03 AM   #4
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Re: 2.73 Rear to 3.73 Rear
Quote:
Originally Posted by jmooreofpure View Post
so, would that be a ring and pinion gear like this ...

http://cgi.ebay.com/ebaymotors/GM-7-...Q5fAccessories
No. Tho's are the gears in the carrier its self. I think its a small plastic gear and it goes behind the tranny I believe.
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Old 08-27-2009, 05:19 AM   #5
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Re: 2.73 Rear to 3.73 Rear
Quote:
Originally Posted by Chezoom View Post
No. Tho's are the gears in the carrier its self. I think its a small plastic gear and it goes behind the tranny I believe.
Do you have any idea what that part is called? If you are able to search for it on ebay copy and paste the link in a reply
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Old 08-27-2009, 05:29 AM   #6
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Re: 2.73 Rear to 3.73 Rear
not something you get on ebay, chevy dealership

use this thread, you might have to pm the OP

http://www.thirdgen.org/techboard/tr...eedometer.html (Sticky: 700R-4 speedometer gears)
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Old 08-27-2009, 08:24 AM   #7
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Re: 2.73 Rear to 3.73 Rear
You'll need the ring and pinion, of course, and all that goes with replacing them, as well as the drive and driven gears to make the speedo read correctly. Phone these guys for what you need:

http://www.transmissioncenter.net/sp...n_______va.htm

The following FAQ may provide some info to consider:

http://www.thirdgen.org/techboard/tr...-10-bolts.html (FAQ About 10-Bolts)

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Last edited by JamesC; 08-27-2009 at 08:36 AM.
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Old 08-27-2009, 03:44 PM   #8
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Re: 2.73 Rear to 3.73 Rear
Will replacing the drive and driven gears to match the rear affect the way the car drives (or shifts)?
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Old 08-27-2009, 03:50 PM   #9
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Re: 2.73 Rear to 3.73 Rear
Quote:
Originally Posted by jmooreofpure View Post
Will replacing the drive and driven gears to match the rear affect the way the car drives (or shifts)?
No.

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Old 08-27-2009, 04:25 PM   #10
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Re: 2.73 Rear to 3.73 Rear
PM me if you need any more help figuring it out.
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Old 08-27-2009, 04:25 PM
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