Went from 2.77 to 3.23.
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Joined: Nov 2000
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From: Corpus Christi, TX
Went from 2.77 to 3.23.
What gears do I nead for my speedo now. I would like to only have to change the driven gear. Its a 89 tpi 350 with a 145 speedo and 700 r4.
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1989 Iroc-Z TPI 350 auto 4-spd Removed MAF screens K & N filters, stock other than that.
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1989 Iroc-Z TPI 350 auto 4-spd Removed MAF screens K & N filters, stock other than that.
Joined: Mar 2000
Posts: 5,703
Likes: 132
From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
You will need to add 3 teeth to your driven gear (ie. if you have 35 teeth you will need 38) etc. However if adding 3 puts you over 40 teeth on the driven gear you also have to change the housing (or sleeve as they call it) because it has the be offcenter for any no. over 39.
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