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Unread 06-21-2009   #1 (permalink)
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Default 1985 mustang GT 5th gear mph?

Just a quick question, in 5th gear when I'm cruising at 2000 rpm can you give me a base at what my MPH would be, I'm assuming it has 2:73 gear ratio, thanks
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Unread 06-21-2009   #2 (permalink)
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Just a stab at it... with 2:73's in 5th and stock height tires, it'd be around 70-75 mph.
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Unread 06-21-2009   #3 (permalink)
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My 3.08s with nearly stock tire height in 5th at 2k rpms give me 75 mph. I would guess you would be closer to 80 because of the lower gearing. You can figure out your gearing by jacking the rear of the tire off the ground and rotating your tires around one revolution and count the number of revolutions the drive shaft makes, this is your gear ratio.

Last edited by redwalsh87; 06-21-2009 at 05:28 PM. Reason: Typo
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Unread 06-22-2009   #4 (permalink)
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Quote:
Originally Posted by redwalsh87 View Post
You can figure out your gearing by jacking the rear of the tire off the ground and rotating your tires around one revolution and count the number of revolutions the drive shaft makes, this is your gear ratio.
Good idea but telling the difference between 2.73 and 3.08's like that would be real tricky, hey I'm in Middlebury work in watertown, where you at?
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Unread 06-22-2009   #5 (permalink)
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Quote:
Originally Posted by 85saleenclone View Post
Good idea but telling the difference between 2.73 and 3.08's like that would be real tricky, hey I'm in Middlebury work in watertown, where you at?
I'm in Roxbury and work in Middletown, good to know theres some other stangers around

Another method would be to look at the axle code, one of the stickies at the top of the tech forum explains it all.
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Unread 06-23-2009   #6 (permalink)
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it shouldn't be to tricky, rotate the tire once and see how much the driveshaft rotates, its going to rotate just over 3 times or about 2 and 3/4 times, you should be able to tell the difference just fine, take some chalk and mark the bottom part of the drive shaft and lowest part of the tire
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