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AxL questions!

2K views 30 replies 10 participants last post by  50Johnbob 
#1 ·
K so it looks to be that: I have a Dana 44 rear and a 35 front, my jeep is a 2000 TJ sahara with a 6.5 lift running 35s so the question I have (newb to gearing) how do I tell if the PO had it re geared ?? Thanks for the help!
 
#9 ·
Most Jeep TJ's have a Dana 30 front axle, except Rubicon which comes with a Dana 44, so a 35 in the front would be odd. The tag on the axle housing / differential cover (if the tag is even there) would tell you what gear ratio it came with the from the factory. If you think the gears have been changed you can find out with just a floor jack. If you have an open differential (no locker), chock the front tires & jack up 1 rear tire, mark the tire & drive shaft, spin the tire 2 complete revolutions & count the number of revolutions of the drive shaft. If the drive shaft spins a little more than 3 times, that would mean 3.07. Close to 4 revs but not quite = 3.73, 4 & a hafl revs = 4.56, etc.
 
#15 ·
Ok sounds simple enough but a few more questions should I mark it somewhere? And also both tires jacked up? And front or back? ::hide::
Yes, mark the tire...you need to be able to see when it has made its full rotation. You can jack up one tire IF you are open or have selectable lockers. LSD or autolockers, you will need to jack up both tires. The back would be easier to deal with.
 
#23 · (Edited)
For a locked or LSD-equipped axle, it takes one revolution of one tire to spin the driveshaft the number of revolutions to equal the ratio.

But with an open axle, it takes rotating a tire two revolutions to rotate the driveshaft the number of revolutions to equal the ratio.

Note step 5 at http://www.ehow.com/how_12156231_calculate-gear-ratios-rotating-rear-wheel.html and also note the Tips & Warnings at the end that talk about rotating it just one revolution for locker or LSD equipped axles. :)
 
#27 ·
Jerry Bransford said:
For a locked or LSD-equipped axle, it takes one revolution of one tire to spin the driveshaft the number of revolutions to equal the ratio.

But with an open axle, it takes rotating a tire two revolutions to rotate the driveshaft the number of revolutions to equal the ratio.

Note step 5 at http://www.ehow.com/how_12156231_calculate-gear-ratios-rotating-rear-wheel.html and also note the Tips & Warnings at the end that talk about rotating it just one revolution for locker or LSD equipped axles. :)
So i def don't have an LSD or lockers unless the PO hid the switch still searching ha ha so I'll just do the two spins, one more question what if I open the diff and take a picture? I needed to do a drain and fill anyways. Would any of you be able to tell?
 
#31 ·
Well, if you need to drain it anyway, a picture would be a great idea. Like Jerry said, it needs to be a good picture of the parts that need to be seen. Rotate the differential carrier so that the area of the spider & side gears can be seen easily. Just take a few pics if you're not sure.
 
#30 ·
Ibuildembig said:
Too much crap, just pop the cover and look at the numbers on the ring gear....the oil prolly needs to be changed anyway :)
I've had great experiences with royal purple syncromax for the tranny but never tried it with diff have any of you? Or can you? Like I said super newb when it comes to axels ha ha
 
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