Dejavu

Hey guys,

I'm a new member here and I was wondering if i could get some help from you guys.

I'm going to buy a 1991 mustang GT hatchback, i give the down payment on the 18th and i wanted to see if you guys could help me out with an issue i'm having. The person who's selling it to me has 3.55 rear gears and he says that the car reads more mileage than it should. For example, if he's traveled 1 mile the car wil read 1.3 miles and so on, does anyone know why this is?

This is my first car and I'm a huge mustang fan and I really want this thing to be beautiful, I plan to make it real nice once I have it, if someone could answer that for me, i would really appreciate it.

Thanks guys

grabbem88

what if you have a tremmec tko?and 3.73's? i put a 21 tooth in there and it was way off.

Dejavu

I have no idea what that means, lol.

Basically, the car has 3.55 rear end gears, the spedometer reads faster than it should when traveling, if you travel 1 mile, the speedometer reads 1.2,1.3 etc etc, it just reads higher, which gives me more mileage.. how can i fix that? or what is the problem?

Thanks alot guys , i'll be writing the specs on the car soon and maybe get a picture going

import slayer

I don't think he was talking to you...but..to answer your question about your problem your speedo reads faster now because the speedo gear in your tranny is not calibrated for the new gears and so now it makes your speedometer read faster than what it really says.
Remember, your odometer works off the same cable as the speedo.
You need to find out the speedo gear your need now so that your speedometer is accurate again.

Demon_Mustang

so uh, I'll ask again in case nobody saw it, but anyone know what speedo gear I would need with a 3.27:1 rear-end and a cobra-spec T-5?

Dejavu

Hey guys,

Thanks alot again for the help, its greatly appreciated. I don't know exacly how I can reset this, i'm buying the car with that set up, 3:55 gears and the incorrect speedometer reading, how can I fix that? or do I need to take it to a mechanic?

Thanks alot again guys - This is going to be my very first car and I want to get it right the first time so I'll be here asking you guys alot of questions and stuff, hehe.

Ok good night guys, its 2:48 am, time for bed OOh! and i just ordered new door handles and door lock pins for it I hope the door pins come tomorrow i'm excited about that, lol.

Dejavu

import slayer

Goodnight Johnboy...........LOL

Dbeck002

there are no speedo gears for a 91 LX 5 speed with 3.73s? how can this be every other stang out there is 89-92 5 speed with 3.73s... what do i do?

white93 GT

i have a 93gt with a 5 speed...and 3.73's....i called the local ford dealership and got a red gear they told me it would be around 5mph of actual speed...so idk

FoxGT

Can anyone tell me what I need for mine to be accurate. Transmission is a '75 C4 (thanks to import slayer & uedlose for identifying the year). What tooth gear would I need with 2.73's? 4.10's?