3.42 gear swap ... speedo
08-25-2003, 02:40 PM
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I asked this same question a couple of days ago. I've gotten conflicing answers though. You'll need to swap you speedo gears in the transmission. In my 700r4, I went with a 15 tooth drive gear and 42 tooth driven gear. My speedo was very close with this combination, but I think that either a 41 or 40 tooth driven gear may have been even better. I'm sure someone will point you to 700r4.com's gear calculator or TCI's website, but I've gotten different results from both of them and yet a different result using the method from the tech article on this site. Hopefully someone else can say for sure, but I think that the 15 tooth drive gear and either a 41 or 40 tooth driven gear are your best bet, provided of coarse that you have a 700r4 and stock diameter tires.
08-25-2003, 04:52 PM
#4
Originally posted by Cole
I asked this same question a couple of days ago. I've gotten conflicing answers though. You'll need to swap you speedo gears in the transmission. In my 700r4, I went with a 15 tooth drive gear and 42 tooth driven gear. My speedo was very close with this combination, but I think that either a 41 or 40 tooth driven gear may have been even better. I'm sure someone will point you to 700r4.com's gear calculator or TCI's website, but I've gotten different results from both of them and yet a different result using the method from the tech article on this site. Hopefully someone else can say for sure, but I think that the 15 tooth drive gear and either a 41 or 40 tooth driven gear are your best bet, provided of coarse that you have a 700r4 and stock diameter tires.
I asked this same question a couple of days ago. I've gotten conflicing answers though. You'll need to swap you speedo gears in the transmission. In my 700r4, I went with a 15 tooth drive gear and 42 tooth driven gear. My speedo was very close with this combination, but I think that either a 41 or 40 tooth driven gear may have been even better. I'm sure someone will point you to 700r4.com's gear calculator or TCI's website, but I've gotten different results from both of them and yet a different result using the method from the tech article on this site. Hopefully someone else can say for sure, but I think that the 15 tooth drive gear and either a 41 or 40 tooth driven gear are your best bet, provided of coarse that you have a 700r4 and stock diameter tires.
08-25-2003, 05:29 PM
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Car: 1989 Firebird Formula
Engine: Internal Combustion
Transmission: Completed
Axle/Gears: ones that turn.
You need a purple drive gear and a white driven gear.
Pete
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08-26-2003, 12:54 PM
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Originally posted by seanof30306
can anyone tell me where i get them?
can anyone tell me where i get them?
08-26-2003, 02:16 PM
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Car: 1989 Firebird Formula
Engine: Internal Combustion
Transmission: Completed
Axle/Gears: ones that turn.
The gears for a 700R4 are different than those used in the T5's. I'm not sure about sources for new ones - a dealer would be the logical place - but you could look in the salvage yards for an 86-up T5 equipped V6 Firebird, as they commonly used a 3.42 rear gear.
Pete
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08-26-2003, 02:28 PM
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Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Ok I am home now and have the parts for the T-5 and 3.42 speedo gears right in front of me.
I purchased one from the dealer and another from www.gmpartsdirect.com. If I were you I would go to the dealer and get both. Easier and takes less time than finding a car in a yard and dismantling it to get what you want. Too much work for 30 bucks worth of parts. Ok here we go...
For the round purple one
GM# 14071731
ACD# 14071731
For the white one on the metal shaft (AC Delco part)
ACD#14090592
GM#14090592
There ya go
I purchased one from the dealer and another from www.gmpartsdirect.com. If I were you I would go to the dealer and get both. Easier and takes less time than finding a car in a yard and dismantling it to get what you want. Too much work for 30 bucks worth of parts. Ok here we go...
For the round purple one
GM# 14071731
ACD# 14071731
For the white one on the metal shaft (AC Delco part)
ACD#14090592
GM#14090592
There ya go
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