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Old 06-04-2009, 12:52 AM   #1
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Join Date: Aug 2005
Location: Austin
Posts: 390
Car: 1989 Formula 350 LSX
Engine: LQ9 6.0, XER281HR
Transmission: Stage II 4L60e, Yank 2800
Axle/Gears: 4.10

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Formula with drum rear?

I am under the impression formulas did not come with drum rear ends.

For some odd reason mine has one, it is a 1989 firebird formula, verified by vin. Did these cars come with drum rears, or disc only - which i believe is correct? If this is supposed to be a disc rear car, it would explain the bit of nose dive I have under hard braking. If some one has indeed done a cheap rear swap (probably because it had 3.73s) would it be fairly straight forward to swap back?

I have a perfect 1988 BW 9 bolt with 3.27 that I have all the hardware to, though i suspect the disc hardware (e-brake cables, etc.) were used on the drum rear i have now. Thanks for the help!
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Old 06-04-2009, 01:11 AM   #2
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Join Date: Jul 1999
Location: 51°N 114°W, 3500'
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Car: 87 IROC L98
Engine: 582 Alcohol BBC
Transmission: Powerglide
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Re: Formula with drum rear?

Check your RPO codes
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Old 06-04-2009, 07:58 AM   #3
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Location: Lawrence, KS
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Car: Met. Silver 85 IROC
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's

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Re: Formula with drum rear?

Quote:
Originally Posted by $750 L98 View Post
I am under the impression formulas did not come with drum rear ends.

For some odd reason mine has one, it is a 1989 firebird formula, verified by vin. Did these cars come with drum rears, or disc only - which i believe is correct? If this is supposed to be a disc rear car, it would explain the bit of nose dive I have under hard braking. If some one has indeed done a cheap rear swap (probably because it had 3.73s) would it be fairly straight forward to swap back?

I have a perfect 1988 BW 9 bolt with 3.27 that I have all the hardware to, though i suspect the disc hardware (e-brake cables, etc.) were used on the drum rear i have now. Thanks for the help!
The swap would be straightforward. You'd need a disc brake proportioning valve, the correct e-brake cables (disc brake cables wouldn't fit a drum rear), and drive and/or driven gears to make the speedo read correctly.

JamesC
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Old 06-05-2009, 11:15 AM   #4
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Join Date: Aug 2005
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Car: 1989 Formula 350 LSX
Engine: LQ9 6.0, XER281HR
Transmission: Stage II 4L60e, Yank 2800
Axle/Gears: 4.10

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Re: Formula with drum rear?

RPO sheet is long gone, It is listed as a L98 car on the little sheet i found under the dash pad though, with all electric options, etc. It is also listed as a firebird FFM (firebird formula) on the title.

Does anyone know if the L98 cars were infact 4 wheel disc only?
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Old 06-05-2009, 12:06 PM   #5
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Re: Formula with drum rear?

The following link is interesting, if nothing else:

http://www.thirdgen.org/techboard/hi...-350-drum.html

JamesC
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Old 06-05-2009, 04:13 PM   #6
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Car: 1989 Formula 350 LSX
Engine: LQ9 6.0, XER281HR
Transmission: Stage II 4L60e, Yank 2800
Axle/Gears: 4.10

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Re: Formula with drum rear?

Sounds like some one must have swapped the rear out then, will start looking for a disc rear to replace it.
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Old 06-05-2009, 04:13 PM
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