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

What size speedo gears do I need?

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Old

Jan 22, 2002 | 08:01 PM

#1

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Joined: Aug 2001

Posts: 121

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From: Henry County, GA

Car: 1988 Camaro SC

Engine: 355 Chevy

Transmission: 700

Axle/Gears: 3.73

What size speedo gears do I need?

Can someone please help figure out what speedo gears I need? I went from a 2.72 or 2.73 to 3.73. My drive gear is a Red 17 and the driven is a Red 37. Please help.

Old

Jan 22, 2002 | 08:13 PM

#2

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Joined: Jun 2001

Posts: 639

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From: FL

It's easier to go to tciauto.com go to site map and see speedo chart. You'll need your rear tire diameter, driven gear size and gear ratio, type it all in the boxes and it'll calculate it for you.

Old

Jan 23, 2002 | 03:50 AM

#3

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Joined: Jul 1999

Posts: 4,384

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From: Tulsa, OK

Or I could just tell him and he could skip all the hassle.

PN# 9775187 $7.60
PN# 8642620 $4.07

Speedometer gears for 700-R4 with 3.73:1 rear gear ratio.

Old

Jan 23, 2002 | 04:37 AM

#4

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Joined: Jul 1999

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From: San Diego, CA

In case he altered the size, tire height would help too.

Old

Jan 27, 2002 | 12:52 PM

#5

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Joined: Jul 1999

Posts: 4,384

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From: Tulsa, OK

That's true. Those part numbers assume stock tire height (26 inches).

Old

Jan 28, 2002 | 03:16 AM

#6

Pro Built Automatics

Supreme Member

Joined: Jul 1999

Posts: 3,484

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From: Calimesa, California, U.S.

Assuming that your tires are a little taller than 26" then the tooth count should be 15 drive, & 43 driven.

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