What is a "differential pinion mount bushing"? - JeepForum.com
 
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post #1 of 13 Old 04-26-2010, 04:49 PM Thread Starter
jbwest17
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What is a "differential pinion mount bushing"?

Took the JGC to the dealer for a separate issue (see here) and during the inspection, they found another problem.

This is the description on the paperwork they gave me. They said I had a bad "front differential pinion mount bushing" and it would cost $640.00 to replace it.

I am not familiar with IFS, so could someone please tell me what they are talking about. I picked it up after hours, so the only person there was the cashier and she was clueless. I looked under the front end, but didn't see anything obvious.

Thanks.

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post #2 of 13 Old 04-26-2010, 05:20 PM
robpp
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not 100% sure but the front diff is attached at 2 points with a rubber isolator. to replace them the entire front diff is dropped. these thigs are pressed in.

look around the top of the front pumpkin. you should see 2 mounting points for the diff itself.

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post #3 of 13 Old 04-26-2010, 06:12 PM
Texas WJ
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Is it shifting hard in and out of Park?

265/70-17 BFGoodrich All-Terrain T/A KO, 2" lift, JK Wrangler Moab wheels, Spidertrax Spacers, Rola Roof Rack.
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post #4 of 13 Old 04-26-2010, 06:44 PM
I8AHUMR
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Mine shifted hard from R->N and D->N when one was bad. The center one on mine went out around 50k. It seems to be fairly common from what I've seen on the forum.

The bill on mine was in the mid 300's. No more than $400.

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post #5 of 13 Old 04-26-2010, 07:16 PM Thread Starter
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Haven't noticed any problems shifting.
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post #6 of 13 Old 04-26-2010, 07:49 PM
I8AHUMR
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I'd crawl under there and take a look around. This thread describes my issue and has a picture for reference. As I said, I know many times a bad bushing will result in a hard shift. Maybe it's not too far gone???

http://www.jeepforum.com/forum/f67/h...ft-r-n-824555/

My bushing was on top of the diff. Number 14

93 YJ, 4.0, 4.5" suspension, 33x13.5 Pitbull Rockers, Custom scratch and dent job...

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post #7 of 13 Old 04-26-2010, 08:36 PM
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Just had both of my front differential bushing replaced two weeks ago. It's hard to see if you craw under the jeep but you can move the differential around. If you go over a pot hole and it feels like there is a little extra wobble, that is what mine felt like. Had both replaced and they were practically down to nothing. 53k on my WK so I8AHUMR is spot on. I could feel the difference immediately.

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post #8 of 13 Old 04-26-2010, 09:39 PM
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The hard shift from R to anything was diagnosed from my dealer as the line pressure being high for reverse, to and from. Once I put the superchips on it and put the mileage saver tune it seemed to ease up.. maybe its just me though haha.
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post #9 of 13 Old 04-27-2010, 04:08 PM
I8AHUMR
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I could tell a difference when stopping very quickly while in gear and then going into neutral, versus stopping very slowly. I could tell it was 'clunking' much more. I'm sure there was more energy stored in what was left of the bushing when doing that.

93 YJ, 4.0, 4.5" suspension, 33x13.5 Pitbull Rockers, Custom scratch and dent job...

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post #10 of 13 Old 04-29-2010, 11:31 AM
scottydog
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There are three bushings supporting the front dif. They wear out, common problem. If you ignore it the diff will go eventually. See how much it is to replace all three, the parts are cheap.
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post #11 of 13 Old 05-10-2010, 12:49 PM
fnckr
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How did you do this? Is there a write up anywhere? Could you please post your steps even if you didn't take pics?
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post #12 of 13 Old 05-10-2010, 03:05 PM
robpp
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1. remove front diff
2. press out old bush, press in new bush X 3,
3. replace diff.

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post #13 of 13 Old 05-10-2010, 09:25 PM
fnckr
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Quote:
Originally Posted by robpp View Post
1. remove front diff
2. press out old bush, press in new bush X 3,
3. replace diff.
I've read a post that described a much easier procedure, but wasn't very detailed. Basically, it said to remove driveshaft and some other diff mounting point (probably the three bushings) and rotate the differential down (probably on the half shaft axis).

That might be simpler than removing the half shafts to remove the differential, but I don't know the complete diff removal procedure. Do you have to remove each wheel hub in order to allow room to disconnect the shafts from the differential?
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