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What speedo gear should I get for new 3.42?

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Old 04-24-2008, 05:48 PM
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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
Old 04-24-2008, 07:31 PM
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Car: 1984 Trans Am
Engine: LS1383 in work
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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
Old 04-24-2008, 11:59 PM
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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.
Old 04-25-2008, 05:32 AM
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Car: Met. Silver 85 IROC/Sold
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Transmission: T-5 (Non-WC)
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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
Old 04-25-2008, 07:22 AM
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Car: 1984 Trans Am
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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.
Old 05-12-2008, 04:41 PM
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Car: 1987 IROC
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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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