How much will my speedo be off with the wrong driven gear?
Thread Starter
Supreme Member
Joined: Jan 2000
Posts: 1,187
Likes: 88
From: Mississauga, Ontario Canada
Car: 1987 GTA
Engine: 5.7
Transmission: T5WC
Axle/Gears: 3:27
How much will my speedo be off with the wrong driven gear?
I'm getting a T5 that was in a TBI with an L3 engine I believe. I think it was a 3.08 ratio. My car is a 3.27. I was able to find a 7 tooth blue drive gear, as there is a 9 tooth red one on there now. As you all know there are no VSS driven gears anymore. I'm supposed to have an 18 tooth, but I think this T5 will probably have a 21 tooth. Is this going to set my speedo way out?
Supreme Member
Joined: Jul 2007
Posts: 1,293
Likes: 6
From: Howard Lake, MN
Car: 86 Camaro
Engine: 355- hopefully a 5.3 this summer
Transmission: 700r4
Axle/Gears: 3.42
Re: How much will my speedo be off with the wrong driven gear?
do some math... you need your final gear ratio and tire size to figure out your final drive ratio, then you divide the tooth counts on your drive and driven gears to get your speedometer ratio. divide those two numbers and you will know how far off you will be.
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