random worthless question.
Thread Starter
4th Gear Member
Joined: Nov 2006
Posts: 1,185
From:
random worthless question.
This is probably a waste of a post but i was just curious if anyone might be able to help me. I bought a 1991 mustang gt and the speedo is off by almost exactly 10mph. Im assuming it is off because it has gears and the speedo tooth wasnt replaced. Its an automatic also. Is this a logical explantion? Also, can anyone estimate what they gears MIGHT be that are in there? I currently have a broken back and cant exactly go check heh.
5th Gear Member
Joined: Oct 2006
Posts: 2,594
From: Woodstock, GA
RE: random worthless question.
Read this this post, click the picture. It will tell you which speedo gear you need.
https://mustangforums.com/m_2893811/tm.htm
https://mustangforums.com/m_2893811/tm.htm
4th Gear Member
Joined: May 2007
Posts: 1,926
From: Calif
RE: random worthless question.
One way to find out what your rear gearing is is to jack up the rear end of the car, put it in neutral, disengage the parking/e-brake, mark the driveshaft and then rotate it by rolling the tires.
Then count how many times the driveshaft turns per one revolution of the tires. Three and three-quarters of a turn is going to be 3.73's; just a tad over four turns will be 4.10's; three and a half turns will be 3.55's; etc.
Then count how many times the driveshaft turns per one revolution of the tires. Three and three-quarters of a turn is going to be 3.73's; just a tad over four turns will be 4.10's; three and a half turns will be 3.55's; etc.
D.R. THE PATHETIC DORK
Joined: Jun 2007
Posts: 30,869
From: West Virginia
RE: random worthless question.
ORIGINAL: ALMOST STOCK
One way to find out what your rear gearing is is to jack up the rear end of the car, put it in neutral, disengage the parking/e-brake, mark the driveshaft and then rotate it by rolling the tires.
Then count how many times the driveshaft turns per one revolution of the tires. Three and three-quarters of a turn is going to be 3.73's; just a tad over four turns will be 4.10's; three and a half turns will be 3.55's; etc.
One way to find out what your rear gearing is is to jack up the rear end of the car, put it in neutral, disengage the parking/e-brake, mark the driveshaft and then rotate it by rolling the tires.
Then count how many times the driveshaft turns per one revolution of the tires. Three and three-quarters of a turn is going to be 3.73's; just a tad over four turns will be 4.10's; three and a half turns will be 3.55's; etc.
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