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I put a new T-5 (from NPD, 3.35 first gear) in last fall, and changed from a 2.8 to 3.55 rear at the same time. I followed the formula in NPD and ordered a 21 tooth driven gear. I'm still reading about 20% high. I understood that the driven gears were interchangeable from C4 to T-5. Is that incorrect? Do I need to get a T-5 gear from the dealer? Or do I need to tear apart the T-5 and put a new drive gear on the tailshaft (no, no NO...)?

Gene Zierdt
'65 Conv.
302/roller cam/valves/ported
T-5 w/3.55
negative roll, progressive front, 4 1/2 rear springs
Front & rear anti-sway bars
 

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I have a 23 tooth in my 1990 T-5, i also have 3.55 rear gears. The speedo seems pretty close? The gear
was bought at a local Jeep dealer Part #J3167393. Seems the jeeps have lower gears! Fit's right on the speedo cable...

1966 Mustang Coupe, 302 custom roller cam, holley 650dp,http://www.289mustang.com
http://www.289mustang.com/images/vmfcar.jpg
 
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