Newbie looking for some info on speedo gears

TDM389

Member
Sep 29, 2025
12
3
13
Florida
So I have a 1991 Fox Mustang GT Convertible it came factory with the aod I am in the process of swapping in a T5 and hydraulic clutch I took out the VSS and it has the pictured gear on it I can not find any info on it from a count it has 16 teeth and is unlike most driven gears I can find online it is dark green in color my rear end has no tag on it so I do not know if it has factory gears my door tag indicates 3.27 Gears from the factory but a bunch of other stuff on the tag in inaccurate to the car like the tag saying it came with a white top where as my car has a black top (needs a new top and frame the frame is broken)
 

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Pretty much have to swap aod Speedo gears for t5 version anyway most of the time... Jack the rear of the car up on stands, mark the driversahft, spin the tire 1 time and counting works pretty well for figuring out what gears, then find out which of the three drive gears is in your T5 and your tire size, then plug it in to lmrs calculator for the right Speedo gear.
 
Pretty much have to swap aod Speedo gears for t5 version anyway most of the time... Jack the rear of the car up on stands, mark the driversahft, spin the tire 1 time and counting works pretty well for figuring out what gears, then find out which of the three drive gears is in your T5 and your tire size, then plug it in to lmrs calculator for the right Speedo gear.
I went onto the calculator and using it and plugging in my tire size the year of the T5 and my suspected gear it shows the red gear (21 tooth) which I’m pretty sure I have one of but it’s at my school in my tool box so I’ll use that one and see if it’s accurate if not I can change it pretty easy
 
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