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Old 08-15-2012, 06:52 AM   #1
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my old dana 35 make knocking sound???

Hi
Recently I notice that my old Dana 35 rear differental is making nasty knocking sound.
What do I need to fix it and do swapping a 8.25 out of a 94 Cherokee is a better choice?

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Old 08-15-2012, 07:00 AM   #2
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If your sure its internal I would take the diff cover off an see how the inside looks.the 8.25 is not bad but look for one from a 97 or newer xj as those will have a few more splines for strength or a ford 8.8 is another popular swap from a 95ish to 00 exploxer . also don't forget to make sure your gear ratio matches for the swaped in axle.

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Old 08-15-2012, 07:15 AM   #3
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Quote:
Originally Posted by megax05
Hi
Recently I notice that my old Dana 35 rear differental is making nasty knocking sound.
What do I need to fix it and do swapping a 8.25 out of a 94 Cherokee is a better choice?
Probably your pinion bearing. That can make your pinion wiggle and knock. That is actually how mine started. If that is it you have a timebomb with about 300 miles left if your lucky and don't get it fixed. Sounds like 8.8 time. Btw, the knock is probably the pinion hitting the carrier. Mine was chewed to pieces.
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Old 08-15-2012, 11:44 AM   #4
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Oh that's a problem
I was considering the 8.8 as main position but I can't afford one now and the chrisler 8.25 is laying here on my brother wrecked xj so I think its time to go for the swap if its better than fixing my old d35.
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Old 08-31-2012, 09:56 AM   #5
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Update:
I am done with swapping preaches and shock mountings do I need to regear my front d30
More info:
Current rear axle Chrysler 8.25 from a manual tranny 94 XJ its stock as far as I know however I tried to spin one wheel and both turn same direction maybe a limited slip??!!

Current front axle is the stock 91 manual 4.0l YJ
Stock gearing

If need to regear is the donner xj ring and pinion going to work for the front d30
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Old 08-31-2012, 02:30 PM   #6
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only way to be sure is to pull the pan and look to see if its a limited slip.

Did you check to see what your replacement rear gear ratio is?

Only time you need to change the ratio would be if the front and rear ratio does not match. If they dont match, then it wouldnt matter much which one you changed. You can change the front to match the back, or the back to match the front. Either way you need to know what the ratios are before you make that decision.

Typically, the donor ring and pinion are not the same unless the old XJ was running a d30; even then unless you are doing the work yourself it wont save you much by getting it swapped.
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Old 08-31-2012, 02:47 PM   #7
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I really don't know much about the gearing thing and have no idea how to measure the ratio and about the donner XJ it do run d30 in the front and I can save some $$ by doing it Cruz I won't have to buy it Cruz its from my brother's wrecked XJ.

If there is something I can do to measure the rear axle gearing pls let me know.
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Old 08-31-2012, 09:05 PM   #8
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Then I would suggest not changing the gearing yourself..

as for the check, sometimes the gear ratio is marked on a tag that is bolted to the cover. If you dont have the tag, you will have to either pull the cover and count the teeth on each of the ring and pinions.

The other way is to jack up the rig, spin the tire one complete revolution and count how many times the yoke spins; problem with that method is that it is not very accurate, but if both front and rear counts the same, then it may be right.

The XJ set up is typically different than a YJ, but it can be done. Just check it over real good and see what if any changes you would need to make.
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Old 09-01-2012, 04:30 AM   #9
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Thanks man I really appreciate your help I am almost done reviving this YJ and that is good cause so far I did everything my self only swapping preaches and shock mounting on the 8.25 was in a shop for 60$

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