Hey guys I've just put in 3:73 gears a my speedometer is of 20 MPH. How many teeth do i need for the speedo gear. I now have 22teeth.
The dealer can't tell me, they don't know.

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• 1987 Trans Am 350tpi, 5speed,SLP Headers,Stock 1995 Z28 Muffler, Gutted Cat,Compucam 2030 429 452 Lift & 204 214 Dur.,TbBypass,Ported Plenum,AFPR, SLP LCA,SFC. 13.86@96.8 with 1.96 60ft

You need a 7 tooth drive gear and a 21 tooth driven gear for 3.73 gears and 245/50-16" tires.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

Thanks Kevin for the info. I will go to the dealer to get them.

P.S. I realize this post should have been on Drivetrain and Transmission.

Thanks Kevin for the info. I will go to the dealer to get them.

P.S. I realize this post should have been on Drivetrain and Transmission.

The T5 uses a completely different gear set than a 700. I know i have both. Make sure You get ones listed under a 5spd, not md8(cant remember rpo for t5).

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87z 383,afr 190's, crane hyd roller(224/230-.509/.528,112 sep),Ported and polished mini ram, 30lb inj, 3.42 gears, strange 12 bolt, tremec 5spd, , 1,3/4" slp headers.
"Just remember children, no man can beat you once youv'e found the cliterous." 'chef'

There should be no confusion, since there are no 7 drive or 21 driven gears for the MD8, or 700R4.

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1989 IROC-Z 5.7L

You might have a problem at the dealer tho, I think GM stopped making the 21 tooth T5 gear last year. Try SLP.

Ok I have done this swap and you may have a problem finding the 21 tooth gear cause it has been discontinued. The exact part #'s you need are 14071731 purple 7 tooth...which is still produced and can be ordered, and 14090582 21tooth, I think yellow or light brown gear. The way I found the 21 tooth gear gm part # 14090582...is that I went to partsvoice.com and searched there and I found a gm deal rather close to me that had the part in stock. I searched the website for you and here is what came up...so u can call theses three places and see if they have they have it for you and have them ship it to you.

Parts searched for:
14090582

Quantity Dealership Contact

1 CRIVELLI CHEVROLET
MCKEES ROCKS, PA 412-331-0134
800-282-3393
1 VALLEY CHEVROLET
WILKES-BARRE, PA 570-821-2781
800-722-8826
1 SEATAC PARTS
KENT, WA 253-839-4967
800-735-7191

Later, and good luck


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88 IROC-Z 305 TPI 5 speed
Performance Resource Chip, Flowmaster American Thunder cat back exhaust, B&M Ripper shifter, MSD coil, TB bypass, TPIS MAT relocation kit , TPIS 170* t-stat, Richmond 3.73 gears, March Power & Amp pullies, Home made Ram Air, Steve Spohn SFC's, LCA's , Panhard bar, TPIS AFPR, Ported plenum by Daniel Burk, Gutted cat
Best et: 14.338
Best mph: 96.97
Best 60': 2.106
http://hometown.aol.com/famioso15/johnnyiroc.html