Is there an easier way of telling what gears are in my car? I bought my car used, and i have driven friend's mustangs that are the same year. I know that their gears are stock but my car will be at different speeds at different rpms. Or do i need to take it somewhere to get it looked at? One more question: if they are aftermarket gears, which ones would have me at 3500 rpms in 3rd going 60 - 65 mph?

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Well, they say you can jack it up and turn the tires and count how many rotations the driveshaft make compared to how many rounds the tires make or something to that effect. Ive never done it. I can tell you that if you have 4.10's you will be doing 2400 rpms in fifth gear at 70 mph.

 

if you have 3.73s, you'll be doing 2,000rpm going 65mph (5 speed).

 

go 70 in 4th gear. Look at your tach. If you have 373s you'll be around 3730 RPMS, if you have 3.27s, you'll be near 3270 rpms, 4.10s will put you at 4100 RPMS....

 

I might be right at 2000 rpms in 5th gear going 70. Does that sound likely? I'm gonna try all these variations on my lunch break, so i will post in a few hours. Thanks guys.

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sounds like 3.27s then. i get 2000rpm at 65mph. it might be eithe 3.27 or 3.55.

 

nanaki, I think your off, I have 3.73s and in 5th gear at 2000rpms I'm doing 70 on the dot.

 

You have 3.27's if you're doing 1900-2000 rpms @ 70mph in 5th gear then. I do remember those days.

 

i'm not off. i know what my rpm's are at. trust me, it's 2000rpm at 65.

 

then my speedo must be off?? I have a custom burt chip calibrated for my gears and with 3.73s i was doind 70mph at 2k rpms? I wonder if it has anything to do with having 18in rims?