Transmissions and Drivetrain Need help with your trans? Problems with your axle?

What speedo gear should I get for new 3.42?

Old Apr 24, 2008 | 05:48 PM
  #1  
IROCJoyce's Avatar
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From: New York
Car: 1987 IROC
Engine: 350 Gm H.O
Transmission: 700r4 built
Axle/Gears: 3.42 Locker
What speedo gear should I get for new 3.42?

I have a 700r4 and 10 bolt rear that now has 3.42 gears from 2 series gears. My wheels are the stock p245 50r16 iroc rims Is it a hard job to change it and where is it? I also need to know what gear I should get and from who.

Thanks for the help
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Old Apr 24, 2008 | 07:31 PM
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From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: What speedo gear should I get for new 3.42?

I'm pretty sure you can get the gears from summit. I copied this chart off of a post here on the web-site but I'll be damned if I remember which one...if you do a search on the site I"m sure you'll find more information. I hope this helps!
_____
3.08 has an 9-tooth drive gear (Pretty sure that's anything under 3.23.

3.23's up require a blue 7-tooth drive gear, plus the following driven
gear:

18 tooth (p/n 3987918) Brown = 3.23
19 tooth (p/n 3987919) White = 3.42
20 tooth (p/n 3987920) Blue = 3.45
21 tooth (p/n 3987921) Red = 3.73
22 tooth (p/n 3987922) Gray =3.77
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Old Apr 24, 2008 | 11:59 PM
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Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Re: What speedo gear should I get for new 3.42?

Ozz, the info you posted is for 5-speeds, and this is about a 700R4.
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Old Apr 25, 2008 | 05:32 AM
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Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: What speedo gear should I get for new 3.42?

Originally Posted by IROCJoyce
I also need to know what gear I should get and from who.
You might start here:

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

JamesC
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Old Apr 25, 2008 | 07:22 AM
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From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: What speedo gear should I get for new 3.42?

Originally Posted by Kevin91Z
Ozz, the info you posted is for 5-speeds, and this is about a 700R4.
Well damn...thanks for pointing that out. I wasn't aware there was a difference.

That's the chart I was going by for my 700R4...I just ordered a new gear set off that for my 84 T/A.
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Old May 12, 2008 | 04:41 PM
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From: New York
Car: 1987 IROC
Engine: 350 Gm H.O
Transmission: 700r4 built
Axle/Gears: 3.42 Locker
Re: What speedo gear should I get for new 3.42?

Thanks for the help guys
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