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New gears 3.73 AOD trans

2K views 4 replies 3 participants last post by  Bullitt95 
#1 ·
I decided to go from 2.73-3.73 gears and it was a good choice, the engine revs aren't crazy and I fell less strain on the motor, not to mention the fun factor. Now I just need to know what speedometer gear I need to recalibrate the speedometer. It's a AOD transmission
 
#5 ·
If you're talking about the speedometer gear, you've got that backwards. It should be:

No. of teeth on new speedo gear = (3.73/2.73) x no. of teeth on existing gear

Unfortunately there's no speedo gear with more than 23 teeth so you'll probably need to get that one and accept that your speedo will overread by about 6% (unless you compensate by fitting 6% bigger diameter tires).

1983-95 Mustang 23 Tooth Speedometer Gear & Clip Kit, Auto Trans at LRS - Free Shipping!
 
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