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| GTA TECH Want to discuss technical topics about your GTA.... engine tuning, mechanical upgrades, problem areas, etc.? Then post it HERE! |
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02-24-2016
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#1 |
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Registered User
Join Date: Aug 2013
Posts: 124
GTA Year: 1990
GTA Engine: 350 TPI Automatic
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9 Bolt Question
Hey Guys, there is a guy selling a 9 bolt 3.42 rear end . I know that the gear ratio is suppose to be 3.45 in the 9 bolts, but, he is telling me it was in an automatic car, not standard. My question is, did the Trans Am's come with the 3.45's in the auto's, or was it just in the std trans.
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1990 Trans Am GTA 1982 Pontiac Firebird 1976 Trans Am 1995 LT1 Camaro |
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02-27-2016
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#2 |
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Registered User
Join Date: Aug 2006
Posts: 2,057
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Re: 9 Bolt Question
If its a 10 bolt its 3.42
If its a 9 bolt its 3.45 Both ratios were only available in the 5 speed. If you put it on an auto, you'll have the best out of acceleration and fuel economy. If the price is right and its a nine bolt with no issues on the spider gear, leaks or the positrac, I'd go for it.
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03-01-2016
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#3 |
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Registered User
Join Date: Jan 2010
Posts: 248
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Re: 9 Bolt Question
The standards came 3.45 and the auto cars came 3.27 rear ratio I always wondered if u could get a auto car with the 3.45 rear
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03-01-2016
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#4 |
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Registered User
Join Date: Oct 2012
Location: IN
Posts: 555
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Re: 9 Bolt Question
Kevin,
Too bad you're so far away-I have a Currie Ford 9" sitting in my shop....
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1991 GTA, SLP Perfomance Package 1989 GTA, 26K Original Miles 1988 GTA, Stock |
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03-02-2016
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#5 | |
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Bad luck or no luck
Join Date: Jun 2004
Location: Ravenna, OH
Posts: 1,948
GTA Year: 1987
GTA Engine: Custom
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Re: 9 Bolt Question
Quote:
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87 GTA: Forged 408 LSX short block, TEA stage 2 cnc ported 243 heads, BTR Stage 3 stroker cam, Fast 102 intake, NW 102 TB, Longtube headers, custom 411 ECM, custom harness, custom tuned, Performabuilt stage 2 4l60E with PTC 2800 stall, 9 bolt rear with 3.70 gears and TAP girdle. 11.16 at 123 mph. |
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03-03-2016
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#6 |
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Registered User
Join Date: Aug 2013
Posts: 124
GTA Year: 1990
GTA Engine: 350 TPI Automatic
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Re: 9 Bolt Question
Well the guy who has it is going to pull the cover off and try to see if it is a 3:45 or 3.27. I told him he could just turn the axles and count the revolutions of the yoke, but he wants to actually count the teeth on the ring gear. And he is asking $200 bucks complete with PBR brakes...
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1990 Trans Am GTA 1982 Pontiac Firebird 1976 Trans Am 1995 LT1 Camaro |
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03-06-2016
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#7 | |
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Registered User
Join Date: Jan 2011
Posts: 276
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Re: 9 Bolt Question
Quote:
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03-07-2016
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#8 |
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Registered User
Join Date: Aug 2006
Posts: 2,057
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Re: 9 Bolt Question
The PBRs are really a much better brake design than the older cast irons. Little bit lighter too.
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