Need Help Finding Gear Ratio

[mjbret13]

I'm very curious what my gear ratio is. 88 comanche eliminator 4.0 2wd 5speed Peugeot BA10/5 with Dana 35 rear. It just feels really lacking in power with a set of 30x9r15 cooper discover AT. I. Also curious how to identify gear ratio on a Dana 30 but it's ID tag as a PO started a 4wd swap by swapping a non disconnect d30 in the front from unknown year cherokee.

[mnkyboy]

You most likely have 3.07 gears, the best way to check ratio is to pop the cover and look at the numbers stamped in the ring gear, good idea anyway if your looking to run a used axle.

[88Chief4x4]

Put a piece of tape on the driveshaft and a piece of tape on your tire, get a buddy to watch as you pull forward slowly and get him to count how many times the driveshaft spins to get one full tire rotation, easiest way to get a rough estimate ( 3 driveshaft spins to one tire spin = 3.07; 3.75 driveshaft turns to one tire spin = 3.73

[mnkyboy]

here's how I see it. the tooth count is stamped on the ring gear so if you don't know what ratio you have then you probably havent serviced the diffs in which case its probably due for it.

 

Change the oil and you will know 100% for sure whats in there.

[yxmj]

here's how I see it. the tooth count is stamped on the ring gear so if you don't know what ratio you have then you probably havent serviced the diffs in which case its probably due for it.

 

Change the oil and you will know 100% for sure whats in there.

:yeah that:   X2

[cruiser54]

here's how I see it. the tooth count is stamped on the ring gear so if you don't know what ratio you have then you probably havent serviced the diffs in which case its probably due for it.

 

Change the oil and you will know 100% for sure whats in there.

Perfect.

[mjbret13]

It wouldn't be a bad idea to service the difs. Would 3.07 be fine for running 31's. I don't plan on going any bigger then that. I do plan on swapping to an ax15 with a 231tc so I can have working 4wd.

[nitroxsteve]

You need to check the front and rear to be sure they match before you finish the 4wd install. Like stated above pull the covers and read the numbers on the ring gear. You probably need to change that fluid anyway.