speed o gear for an automatic ?

[MW Staff]

This automatic vert has a 3.73 gear in it & when I went on ebay all the gears say manual only :thumbsdown1:

What do you do with an automatic mine is 10 mph slow

[Wayne's 88 GT]

This automatic vert has a 3.73 gear in it & when I went on ebay all the gears say manual only :thumbsdown1:

What do you do with an automatic mine is 10 mph slow

You can replace the gear...........what year is your vehicle? I may have the gear you need at home..........or I can get the one you need from work.

[Notch93]

1983-1989 Automatic Transmissions with 7 Tooth Drive Gear will be

D0OZ-17271-B
3.73 Gear Ratio / Purple 21 Speedo Gear

1990-1998 Automatic Transmissions with 8 Tooth Drive Gear

Jeep Part #j3167393
3.73 Gear Ratio / White 23 Speedo Gear (Not 100% accurate.) Will still be off by 5 MPH.

[Code Blue]

My '93 has AOD and 3.73:1 rear gear and was 10 mph off. Had to switch to the purple speedo pick-up gear.:thumbsup1:

[Notch93]

My '93 has AOD and 3.73:1 rear gear and was 10 mph off. Had to switch to the purple speedo pick-up gear.:thumbsup1:

If your AOD is out of a 93, the purple gear will be way off. Unless, you change to a 7 Tooth Drive Gear also.:yes1:

[Code Blue]

I took it to the trans shop back in '95 or '96 and asked for the purple gear to replace the stock speedo gear in the tail shaft. I had read that it was the gear to use for the 3.73 gear swap in my '93 AOD (not '94 AODE) and he agreed. If he did more, I can't say, but it's been fine ever since.

[MW Staff]

My car is a 93

[Notch93]

My car is a 93

I would go with a black gear over the white, they seem not to get chewed up.

http://www.mustangunlimited.com/itemdy01.asp?T1=DFM17271J+01&Category=&catkey=74-01

You will still be about 5 MPH over, unless you change out the 8 Tooth Drive Gear, to a 7 Tooth Drive Gear. But that would intel pulling the tail-shaft, if you do that, might as well rebuild it.