What Gears?
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Senior Member
Joined: Dec 2004
Posts: 909
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From: New York
Car: 91 Firebird
Engine: 3.1 V6
Transmission: TH-700-R4
What Gears?
What gears came stock on 91 3.1 Automatic?
What would be a good upgrade and what would the performance differences be?
What would be a good upgrade and what would the performance differences be?
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Joined: Jul 2001
Posts: 4,461
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From: BFE, MD
Car: 13 Ram 1500/ 78 Formy
Engine: 5.7 / 7.4
Transmission: 6sp / TH350
Axle/Gears: 3.55 posi / 3.23
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Joined: Jan 2005
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From: Yes I'm Dean
Car: Agood2.8,
Engine: V6rsr,
Transmission: Afrikingoodtime
I would highly recommend leaving them alone with an automatic 700r4.
I actually purposely went from 3.42's to 3.23's to get a taller 3rd gear (drive) so I didn't have to modulate between D and OD when running harder on the freeway. I would go 3.23's with an auto valve body, or 3.73's with a manual valve body (an Auto with a full manual shifing vavle body installed) 3.42's are bad in the middle.
I actually purposely went from 3.42's to 3.23's to get a taller 3rd gear (drive) so I didn't have to modulate between D and OD when running harder on the freeway. I would go 3.23's with an auto valve body, or 3.73's with a manual valve body (an Auto with a full manual shifing vavle body installed) 3.42's are bad in the middle.
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