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Old 02-22-2012, 02:25 PM   #1
bkelley
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Default Identifying Rear End Gearing And Tune

I was wondering, what is the easiest way to identify what gears you have without actually opening the rear and counting them? Also, is there a way to check if the car has been tuned? The previous owner put a SCT badge on it so I am assuming it's been tuned. I just bought my stang from a dealer and don't really know all that's been done to it, other than what I can see.

I know you can jack the rear up and count the number of drive shaft rotations in relation to one tire rotation, but that's not exactly accurate.
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Old 02-22-2012, 02:39 PM   #2
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Quote:
Originally Posted by bkelley View Post
I was wondering, what is the easiest way to identify what gears you have without actually opening the rear and counting them? Also, is there a way to check if the car has been tuned? The previous owner put a SCT badge on it so I am assuming it's been tuned. I just bought my stang from a dealer and don't really know all that's been done to it, other than what I can see.

I know you can jack the rear up and count the number of drive shaft rotations in relation to one tire rotation, but that's not exactly accurate.
thats very accurate. your only other option is to pull the cover.
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Old 02-22-2012, 07:53 PM   #3
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there is a stamped metal label on my 93 8.8 that has the(original) gear ratio right on it. vin # and some other #s as well. its attached to one of the diff bolts. Wow, you newer guys have to do what to figure out the ratio??!? that sounds annoying
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Old 02-22-2012, 08:53 PM   #4
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If you have a GPS check your rpm vs 60mph and look up your ratio in one of the many gear ratio charts in existence for Mustangs. As long as you have factory sized tires, I think this is the easiest and most accurate method to ID your current ratio.
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Old 02-22-2012, 09:16 PM   #5
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I didn't know I had gears till I had a GPS in my car and I had my speedo set on 70 and the GPS was reading around 61 mph. I took off the rear cover to change the gear oil and it had 3.73 stamped into it. Thought it was weird that the car had 3.73s especially cause I bought the car with mud flaps and 2005 v6 wheels..yuck.
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Old 02-22-2012, 09:45 PM   #6
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Originally Posted by TRUEBLUE3934 View Post
If you have a GPS check your rpm vs 60mph and look up your ratio in one of the many gear ratio charts in existence for Mustangs. As long as you have factory sized tires, I think this is the easiest and most accurate method to ID your current ratio.
I'm running 275/35-18s.

I'm still gonna hit the freeway with my GPS tonight and see if the speedo is accurate.
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Old 02-22-2012, 10:25 PM   #7
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I'm wondering the same. I was told mine was used as a police cruiser. Im left wondering what the may have done. Traction control off the tires wont stop spinning in second til 55mph on dry pavement. Is that pretty normal for a stock 01 gt 5 speed?
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Old 02-22-2012, 10:32 PM   #8
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Yeah, with traction control off I can spin the tires with ease. What made me think it might have some aftermarket gears.
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Old 02-23-2012, 08:56 AM   #9
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This is a experimental thing, however record your speed and rpm in 4th gear (3rd for an auto) and plug those numbers and your tire size into this "Rear Axle Gear Guesstimator".

This shows the calculations for traveling 50 mph, at 2500 rpm in 4th gear:

Click the image to open in full size.

Using a GPS recorded speed will be more accurate as it eliminates speedometer error...
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Old 02-23-2012, 01:27 PM   #10
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Sweet! I'll try that later today. Thanks.
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O/R Midpipe, Slotted Brembos w/ Hawk HPS Pads & SS Lines, Cam
'73 Q-Code Mach 1:
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Old 02-23-2012, 01:27 PM
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