Ok this might be a really embarassing question but I am going to ask it anyways. I was told the car had 3.55's so I jacked it up today just to see. (I knew it had some kind of gear, because for every 10 mph it was off by 2 i.e. going 30=36 100=120) and the car odometer read way quicker. So I jack one side up, then get ready for the other, (this is my left side a.k.a driver side) and I can turn the wheel and the driveshaft moves , so I say what the heck and count the rotations of the driveshaft just by spinning the left tire. Now here is where I am confused , where the yoke is (I think that is what it is called), there is four seperate edgings, I placed white out on one so I would now how many times it spins. Well I spin the tire over probably ten different times, and according to my cacluations the car would only have about 2.37 gears (now I know that is laughable but dont laugh because I need help :nonono: ). But if you count it by every half rotation it would be 3.73's, now I am one hundred percent sure I counted the driveshaft spins correctly, I did it so many times I figure there must be something I was doing wrong, so help a noob mustang owner out please. :TY:
Help a noob out
- Thread starter pooker
- Start date
scott5
Active Member
sounds like 3.73s
Thanks Scott I know it had to have something, plus it tops out way to soon and feels to raunchy in first (not sure if thats the term that I want to use for a mustang but I said it and I am sticking with it :rollinglaugh: ) . :TY:
Wait I think I typed that wrong.
"Jack up the rear axle and support it with jack stands. Put the transmission in neutral and then rotate the rear drive shaft by hand. While turning, count the number of drive shaft revolutions required for one revolution of the tire. If the drive shaft turns approximately 3-3/4 times, you have a 3.73 ratio, etc. It may help to use a piece of chalk mark a reference point on both the tire and drive shaft. For increased accuracy it is recommended to rotate the wheels two times and divide the result by two. You may have different gearing front to rear (but the difference is typically very slight) so be sure to check the other axle too."
Number of Turns Approximate Gear Ratio
2 - 3/4 2.72:1 or 2.77:1
3 - 0 3.07:1
3 - 1/2 3.54:1
3 - 3/4 3.73:1
4 - 0 4.10:1
4 - 1/2 4.56:1
4 - 3/4 4.88:1
Yup I typed that wrong. This is what I meant.
"Jack up the rear axle and support it with jack stands. Put the transmission in neutral and then rotate the rear drive shaft by hand. While turning, count the number of drive shaft revolutions required for one revolution of the tire. If the drive shaft turns approximately 3-3/4 times, you have a 3.73 ratio, etc. It may help to use a piece of chalk mark a reference point on both the tire and drive shaft. For increased accuracy it is recommended to rotate the wheels two times and divide the result by two. You may have different gearing front to rear (but the difference is typically very slight) so be sure to check the other axle too."
Number of Turns Approximate Gear Ratio
2 - 3/4 2.72:1 or 2.77:1
3 - 0 3.07:1
3 - 1/2 3.54:1
3 - 3/4 3.73:1
4 - 0 4.10:1
4 - 1/2 4.56:1
4 - 3/4 4.88:1
Yup I typed that wrong. This is what I meant.
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