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Old 02-19-2009, 09:01 PM   #1
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Rear main seal leaking

Any of you wrench turners ever replaced the rear main engine seal. I have an 88 YJ with the 4.2 manual. How hard is it, what special tools, how long does it take, what to expect.


I got a quote from my local garage of $400.00. I don't know if that is good or bad.

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Old 02-19-2009, 09:54 PM   #2
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400 bucks is a fair price in my opinion, and most shops guarantee their work. (Unless you have your own shop with a lift and all of the necessary tools of course.) It's not the kind of job that lends itself to laying on you back in your garage or driveway. Believe me, you'll have a cussing fit trying to get those transfercase skid plate bolts off if they've never been off before. And if that doesn't bug you, you'll have fun bench pressing the tranny... unless, again, you have the right shop equipment! You get the picture?

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Old 02-20-2009, 03:02 PM   #3
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never done 4.2, but the 4.0 is a two peice seal that is removed by removing oil pan and rear main cap. no trans removal.

and thinking about it, the 4.2 i just disassembled was the same if i remember right
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Old 02-20-2009, 09:10 PM   #4
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i did mine about a month ago. its a two piece seal, so you dont need to remove the transmission. all i did is drop the oil pan and the rear bearing cap. its not to bad of a job.
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Old 02-20-2009, 09:17 PM   #5
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not really any special tools, just socket wrenches. when removing the top seal they say to use a punch to get it out. what i did is use a small torx driver socket on to long extensions and tapped on it with a hammer. dont forget to buy a new oil pan gasket.
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