92hatchLX

Hmm, I know where an SVT dealer is, except it's pretty far, I'll just order it off the internet, or better yet, I've got a mustang speed shop near me.

rsw007

last time i checked though svt only sold the short nipple 23 tooth. which is for the 5 speed ,i may be wrong though.5.0 resto sells a long nipple 23 tooth for aod.
http://www.latemodelrestoration.com/...t_50_home.aspx
part #lrs-17271j

nitrous_bob

it's because you can't get one for a '91

they don't exist, you need to pull your trans apart and replace the drive gera, which is machined onto the output shaft.
so you need an older output shaft , yours has an 8 tooth drive and whatever driven for your stock combo.

you need either a 7/21 combo or a 6/18 combo (drive/driven resp.)

or you can go to a speedo calibration shop and have a "box" built. either way it's gonna be about a grand, unless your gonna tear apart the tranny yourself


EDIT ******* i should have read all these posts, the one from steeda IS NOT correct for you. w/ your drive gear you would need about a 25 tooth driven which obviously does not exist. the 23 tooth gears are from mopar, and they are white. it's a jeep part. they are also a different pitch from an aod, and will last about 10k miles at most, and still gonna be close to 10% off

92hatchLX

So should I just go with 3.55 gears?

Quik

NO dammit, just get the 410s and be happy. get the gear and live with replacing a speedo gear once a year lol

nitrous_bob

no get what you want, i never correct my speedo's , you get used to it.

depending what size your tire measures out to (how tall) the 3.73's wouldn't actually be all that bad as far as error.

i would never do 3.55's in an aod. you would hardly notice a diff, if you have 3.27's currently, you won't notice much going to 3.73's and will wish you went 4.10's. in the door tag, check ax code, z=3.08 and e=3.27 m=2.73 but i don't think they put 2.73's in a aod at all.

Quik

273 was standard gear for either AOD or T5 cars

327 was optional for AOD
308 was optinaol for t5


my first 89 GT had 273 gears it was a dog!!!!!!!!!!!
my 88 hatch had 327, now 410
my 88 notch had 308, now 355

nitrous_bob

yeah i wasn't sure, both my aod's were 3.27 and all 3 5-speeds were 2.73

and trust me even the 3.27 was slow in the aod. 4.10's all the way , i would never use less.