bkelley

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.

kugzgt

thats very accurate. your only other option is to pull the cover.

tomaschurizoe

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

TRUEBLUE3934

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.

65mechanic

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.

bkelley

I'm running 275/35-18s.

I'm still gonna hit the freeway with my GPS tonight and see if the speedo is accurate.

phoenixfriend84

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?

bkelley

Yeah, with traction control off I can spin the tires with ease. What made me think it might have some aftermarket gears.

cliffyk

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:



Using a GPS recorded speed will be more accurate as it eliminates speedometer error...

bkelley

Sweet! I'll try that later today. Thanks.