I *really* hate to ask this, but........

I have a T-5 in with 3.23's. I have gathered that I need some combo of the following:

7 tooth drive gear, 19 tooth driven (which I have)

or 8 and 20's.......

Sound about right?????

I managed to find a list of part numbers and the gear colors, but I lost it. And I can't get back to it again.

HELP!!!!



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Sam Strano Jr.
Strano Performance Parts
800-729-1831
www.stranoparts.com

 

Your 7/19 combo should work just fine.

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1989 IROC-Z 5.7L
NOS 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System

 

7/19 is the stock 3.42/3.45 gear combination, you need the 7/18 combo, which is tough to find. Search this board, the part numbers have been posted as I found them once before.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Kevin is right, the 18 would work. But if you do the math:

20.168 * 3.23 * 7 / 25.65 = 17.77

Rounding 17.77 up is 18, but the 19 would give you a little more breathing room with the speedo. And since you already have those in your possession....

By the way, this is assuming you are running a 245/50/16 tire.
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1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System

[This message has been edited by Omar (edited August 01, 2001).]

 

what gear do i need for my 87 iroc with 3.73 gears? i have the 3.45 speedo gear in currently, what color is the one i need and what is the part #?

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87 IROC-z 305 TPI 5spd 10-bolt 3.73 posi ,8.8 Accel wires , bosch platinum +4 plugs,MAF sensor screens removed, gutted air box, ram air, K&N air filters,TB coolant bypass ,polyurethane tranny and torque arm mounts, K&N oil filter,Mobil 1 synthetic oil 20w50, futura GLS super sport tires 265/50/15 rear and 235/60/15 front mounted on 86 monte carlo SS rims ,

400 sbc and a 6 spd in the works

 

With your current 25.43" tires, you would need a 7T drive and 22T driven gear. I am sorry I dont have any color or part numbers for you. If you do an archive search, they may have been posted in the past.

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1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System

 

I thought the 7 tooth and 21 tooth was the combo for 3.73's stock from the factory?

 

Kevin, that would be correct for the stock 245/50/16 (25.65") tall tire, but he is running a slightly shorter (25.43) tire, requiring him to up the driven gear from 21 to 22.

In this case, the actual number of the driven gear per the equation is 20.7. Yes, he could round up to 21, but the 22 gives him the breathing room for error (again).

For anyone else wondering, the error would be something like doing 66-67 when the speedo reads 65 (for the 21 gear), and actually doing 63-64 with the speedo reading 65 (for the 22 gear). Your speedo will never be dead on accurate, so giving yourself a little bit more room for error will help you avoid that **** retentive officer.

Glenn has a better grasp of the percentages of errors than I do if you wanna ask him.

Sorry, Glenn.

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1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System