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!
Ya if you just put the rear axle on stands, both tires will spin. Just make a mark on the tire with chalk or something, and then spin the drive shaft until the mark makes its way back to its start location.
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.
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.
With only 1 axle turning you have to make 2 revolutions to spin the ring gear 1 revolution because of the 2-1 ratio between the spiders and side gears.
The spider gears and side gears do not share a gear ratio relationship. I really don't know how to explain it. The best I can do is show you this video and watch very carefully the relationship of the spider gears and side gears.
The spider gears and side gears do not share a gear ratio relationship. I really don't know how to explain it. The best I can do is show you this video and watch very carefully the relationship of the spider gears and side gears.
Thank you Jerry for your post & the link. I tried to find an example on the web that would explain or verify the method I posted earlier. I'm glad you were able to find one.
your tire size or gear size will affect your speedo your best bet is to see what gears you have in it and get you a new speedo gear to correct your speedometer for your gear and tire size
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?
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.
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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