Im leaking gear oil where my axel goes into my differential on rear end of 1997 jeep grand cherokee laredo 4x4 straight 6 engine & when i checked it the drive line moves when you wiggle it. auto shop recomends changing seal & bearing im wondering if any information that would help me on this? thanks
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Leak at the front is likely from the c/v joint, Either the strap is loose or the boot is split. Replacement is nearly the same exact job as replacing the axle itself and generally the price of a rebuilt or scrapyard axle is worth the $. Leak at the rear sounds like a pinion seal. Though it is easy to do that job, if you don't do it correctly you will change the pinion gear depth and that can cause the differential to fail. I recommend you get a haynes or chilton manual to do this work or have a competent shop do it for you. If the rear leak isn't terrible, often you can add lucas additive to the diff lube and just keep an eye on it so it doesn't run low. (check level at the plug in the rear cover). Any problems or other questions, just ask!!
The only place you did not mention is the pinion seal (at the yoke where the driveshaft connects) Any leak from a differential should be fairly obvious...clean everything off well and drive it, You should see seepage somewhere. Any grease on the wheels or new fluid where you cleaned will tell you where to look. If it is at the pinion seal, If you haven't done this before, don't...you can disturb the adjustment inside the gear case and damage the gears.
You will need to remove the differential rear cover,drain fluid, remove wheel, brake drum, (rotor) . Unbolt center diff. pin, carefully remove (don't loose shims) push axle in remove lock keeper, then slide out axle, replace seal, put some grease on it, slide axle in reverse all to install.
call jeep and give them last 9 digits of your vin and ask for three things -Differential Type,Gear ratio, and Track lock- They will give you 1) Dana 35 or 44 2) Gear Ratio 3.31 or 3.73 3) Track Lock - yes/no
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