So I spun the tire and counted the d shaft rotations...

[ShawnM]

and I still don't have a f'ing clue as to what gears are in the parts rig I am looking at.

1 turn of the pinion = .5 turns of the drum
2 turns of the pinion = 1 full turn and a bit more. My mark ended at the 12:30 - 1:00 drum position.
3 turns = 7:00 drum position
4 turns = 2:00 drum position

Help? :confused:

[NetBSD]

i never did it that way, i always just pulled the cover or 3rd and counted the teeth

[kury]

Something aint right.. you have 1:0.5, for your first set of #'s then you have 2:1, and last you have 4:2.. but where does the 3:7 come from? That is totaly a different ratio and I find it hard to believe that set of #'s came from the same set of gears..

Did you leave one tire on the ground when you were spinning/counting things?

[ShawnM]

Something aint right.. you have 1:0.5, for your first set of #'s then you have 2:1, and last you have 4:2.. but where does the 3:7 come from? That is totaly a different ratio and I find it hard to believe that set of #'s came from the same set of gears..

Did you leave one tire on the ground when you were spinning/counting things?

At least you're confused also. :confused: This is an open diff and the drivers drum was siezed so only one side was spinning. Keep in mind that my comparison to the clock is approx. I tried to pull the diff cover but the bolts are rusted and stuck solid. Plus the rig is stuck in a hell of a spot and it'd be a huge pain to mess with the bolts.

It's an '85 Cherokee, 5spd, 4 cyl if that helps at all. Orig all I wanted was the front d-shaft but the price is right for everything else.

[kury]

Well if its stock it should be a dana 30 front end w/ reverse cut gears
which means it should have a ratio of 2.73-3.54 or 3.73-4.56 and the lug patteren should be 5 on 4.5".

I would recommend going back to the vehicle and turn the wheel 1 full turn & count how many times the drive shaft spins..
that will give you alot more acurate measurement.

[ShawnM]

I would recommend going back to the vehicle and turn the wheel 1 full turn & count how many times the drive shaft spins..
that will give you alot more acurate measurement.

1 turn of the drum = 11:00 on the pinion. Not quite a full turn...

[ridefast]

uhhhh

wtf? are you counting full rotations?

[4x4junkie]

If only one side is rotating, you have to count the pinion turns with TWO rotations of the axleshaft.

If I was gonna guess by what you've posted, you got 1.8:1 gears, so something still ain't makin' sense.

[ZukIzzy]

Spider and side gears are not always 2 to 1. Your method will only work in determining the gear ratio if both wheels are turning while you turn the drive shaft. if 1 is frozen you need to factor in the ratio of the spider and side gears. I don't know it off hand but someone may.

Wayne

[truehi9]

I would keep 1 wheel stationary, turn the other wheel twice, count the turns on the pinion. That always works for me. Just my .02.

[Urban Wheeler]

At least you're confused also. :confused: This is an open diff and the drivers drum was siezed so only one side was spinning. Keep in mind that my comparison to the clock is approx. I tried to pull the diff cover but the bolts are rusted and stuck solid. Plus the rig is stuck in a hell of a spot and it'd be a huge pain to mess with the bolts.

It's an '85 Cherokee, 5spd, 4 cyl if that helps at all. Orig all I wanted was the front d-shaft but the price is right for everything else.


If the axle is seized and rusted like that you may be better off passing on it.

[Fordtrucks]

i have 3.50 gears in my locked axels and i spin a tire one time around and the pinion spins three and a half times

[Grandpa Jeep]

Yup, spin the drum two full turn and count the pinion turns, not the other way around.

[truehi9]

If its locked one turn of the wheel/drum, if its open two turns of the wheel drum and keep the other one stationary. And count the pinion as you turn.