What size speedometer driven gear

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Oct 12, 2011 | 08:22 AM

LostX

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From: Starkville

Car: 88 Trans Am

Engine: 350

Transmission: T5

Axle/Gears: Posi

What size speedometer driven gear

I have a 3.42 rear gears, my rear tires are 285/40R17 with a 26inch diameter.

My transmission is a t5, it has a VSS electronic speed sensor, it has a white drive gear with 5 teeth

I have no idea where to start on what gear i need to make my speedo work

Oct 12, 2011 | 08:56 AM

jmd

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From: Aridzona

Car: `86 SS / `87 SS

Engine: L69 w/ TPI on top / 305 4bbl

Transmission: `95 T56 \ `88 200-4R

Re: What size speedometer driven gear

Since GM T5 speedo drive gears were 7 or 9 tooth, I'd start by pulling the VSS and using a sharpie to mark the drive gear and recounting the teeth.

Oct 12, 2011 | 10:27 AM

LostX

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From: Starkville

Car: 88 Trans Am

Engine: 350

Transmission: T5

Axle/Gears: Posi

Re: What size speedometer driven gear

it is a 5 tooth drive gear i counted correctly.

Its not an original GM transmission it is a remanufactured transmission

i found a website with some kind of calculator and it says i need a 13 or 14 tooth speedometer gear but im not too sure on that and wouldnt know where to buy one

Last edited by LostX; Oct 12, 2011 at 10:38 AM.

Oct 12, 2011 | 10:59 AM

TTOP350

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From: Il

Car: 1989-92 FORMULA350 305 92 Hawkclone

Engine: 4++,350 & 305 CIs

Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5

Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt

Re: What size speedometer driven gear

my parts book only goes to 89 but I found in the 88 section you need
Im not sure what year car you have..
This is for a 245/50/16 tire which my be close to your tire??? and get you fairly close..

7tooth drive, Dcode, PT# 14071731 purple
19tooth driven, N code, PT# 14090592, white (sleeve/sensor 25007350)

GM PART # 14071731
PACK QTY: 1
List Price: $8.20
Price: $4.82

GM PART # 14090592
List Price: $25.95
Price: $15.23

Last edited by TTOP350; Oct 12, 2011 at 11:08 AM.