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Unread 08-05-2015, 03:38 PM   #1
VegasGT
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1988 MJ Comanche 
 
Join Date: Nov 2009
Location: Leitchfield, KY
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Vac-Disco D30 Worth Keeping?

So my MJ has the factory vacuum disconnect HP30. I was originally intending to just pick up a cheap late model HP30 to replace it with but lately Ive entertained the idea of just running what I have.

Obviously it has the two piece axles with smaller u joints, but I have a pair on late model 297x shafts to swap in, and I can change the inner axle seal while I have the carrier out to install the Aussie, then just make a block off plate. Now the ball joints are shot but Ill be upgrading to better ball joints on whichever D30 I choose to run.


Concerns:

*Since its an 88 I believe it should have the AMC knuckles and therefore AMC specific brakes and unit bearings. Any downsides there? Braking power any different? Parts availability an issue at local stores?

*And the housing itself, stronger? Weaker? Negligible?

*Any other things I should consider?


Basically Im just trying to decide if I should pick up a standard HP30 or just mod what I have. Appreciate any input.

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Unread 08-05-2015, 08:18 PM   #2
bluejunior
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2001 XJ Cherokee 
 
Join Date: Jan 2009
Location: Dallas, Texas
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Quote:
Originally Posted by VegasGT View Post
So my MJ has the factory vacuum disconnect HP30. I was originally intending to just pick up a cheap late model HP30 to replace it with but lately Ive entertained the idea of just running what I have.

Obviously it has the two piece axles with smaller u joints, but I have a pair on late model 297x shafts to swap in, and I can change the inner axle seal while I have the carrier out to install the Aussie, then just make a block off plate. Now the ball joints are shot but Ill be upgrading to better ball joints on whichever D30 I choose to run.

Concerns:

*Since its an 88 I believe it should have the AMC knuckles and therefore AMC specific brakes and unit bearings. Any downsides there? Braking power any different? Parts availability an issue at local stores?

*And the housing itself, stronger? Weaker? Negligible?

*Any other things I should consider?

Basically Im just trying to decide if I should pick up a standard HP30 or just mod what I have. Appreciate any input.
As far as I recall from my HP hunt, you just need to grab later shafts and stick them in, the put a plate to block up the hole for the disco. That extra bit might catch on something but otherwise I know of no notable disadvantage. Someone may come along and correct me though
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