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Poison spyder items @ oconee off road 706 534 9955Oconee Offroad Sales Tech are Available To Help!Zone Offroad Body and Suspension Lift Kits, Brackets, Disc

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Unread 02-11-2012, 01:44 PM   #1
JeepComanche89
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1989 MJ Comanche 
 
Join Date: Jan 2012
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Help with rear disk conversion

I am attempting to do a rear disk conversion on a 89 MJ with a Dana 44 rear axle. I was told parts from a 95 to 98 grand cherokee would be compatible. I ordered rear caliper mounting brackets with dustshields from a 1995 grand cherokee Orvis edition. However the bolt pattern on the mounting brackets is completly different from that of my dana 44 axle. Did I order the wrong parts?

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Unread 02-11-2012, 07:05 PM   #2
Garvin
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1986 MJ Comanche 
 
Join Date: Feb 2005
Location: Wrightstown, New Jersey
Posts: 312
Orvis edition was a trim package mainly. From what I remember, the 5.2L was standard and the 4.0L was optional. If you got the bracket for the one with the 4.0L then the center hole will be a different bore diameter. You will need to enlarge the hole. When you install it, you will have to add a spacer from the Dana 44 Grand Cherokee's to get the proper bearing preload. The link below is for a Dana 44 on a TJ but it's exactly the same for the MJ's.

http://www.stu-offroad.com/suspension/d44brake/bc-1.htm

Other than the center hole, the four mounting bolts will be the same (I did this same exact swap on a buddies Dana 44 a few months back).
__________________
[B]1986 Jeep Comanche 126000+ miles[/B]
Long Bed, Chevy 350 TPI (5.7L V8), AX15, NP231
Roll Bar, 15/38.5R16.5 Ground Hawgs, Bastard lift (Custom 3-link long arm system, 4.5" Rusty's front springs w/ 1.75" spacers and 6.5" RC shocks, SOA rear), Dana 60HP/Sterling 10.25, 4.10's, Recessed winch, more mods to come...

[B]1992 Jeep Comanche 174000+ miles[/B]
Short Bed, 4.0L I6 HO, AX15, NP231
In the process of doing a frame up restoration.

...RIP...
[B]1990 Jeep Cherokee XJ 207774 miles[/B]
4.0L I6, AW4, NP231. Tom Woods SYE and Drive Shaft, Rusty's 8.0" Long Arm Suspension Lift, 36/13.5R15 Super Swamper IROK's, Dana 30 Front, Tube Diff Guard, Dana 44 Rear, 4.56 gears, Ox Locker, disc brake conversion
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Unread 02-11-2012, 08:41 PM   #3
JeepComanche89
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1989 MJ Comanche 
 
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Posts: 2,403
Well for some reason the bolt pattern on my axle flange is completely different. Could it be possible a different version of the dana 44 was used in stu's writeup? The axle im using is from a 89 comanche.
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Unread 02-11-2012, 09:04 PM   #4
JeepComanche89
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Does anyone know what version of a dana 44 was used in a 89 comanche longbed 4x4? And what versoin is used in the writeup from stu's offroad? I was following that writeup and everything seems good except for that the caliper mount does not bolt up to the axle flange.
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Unread 02-11-2012, 09:30 PM   #5
Garvin
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Location: Wrightstown, New Jersey
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Might be a stupid question but...You sure you got the left hand one on the left hand side? I forget if the bolt holes are the same side to side or not. As far as I know, all Dana 44's have the same 4 bolt holes, the same goes for the 35's (I've had quite a few 44's and 35's come past my way and they were all the same, from FSJ/XJ/TJ's on the 44's and XJ/MJ/YJ/TJ's on the 35). Might be another stupid question but gotta ask it, are you sure it's a 44 back there and like a 35, 8.25 or AMC 20? Just trying to get all the info straight so I can help out where I can. Also make sure that the brackets that were ordered for the Orvis are for the 44 or 35. Do you have the part number for the brackets?
__________________
[B]1986 Jeep Comanche 126000+ miles[/B]
Long Bed, Chevy 350 TPI (5.7L V8), AX15, NP231
Roll Bar, 15/38.5R16.5 Ground Hawgs, Bastard lift (Custom 3-link long arm system, 4.5" Rusty's front springs w/ 1.75" spacers and 6.5" RC shocks, SOA rear), Dana 60HP/Sterling 10.25, 4.10's, Recessed winch, more mods to come...

[B]1992 Jeep Comanche 174000+ miles[/B]
Short Bed, 4.0L I6 HO, AX15, NP231
In the process of doing a frame up restoration.

...RIP...
[B]1990 Jeep Cherokee XJ 207774 miles[/B]
4.0L I6, AW4, NP231. Tom Woods SYE and Drive Shaft, Rusty's 8.0" Long Arm Suspension Lift, 36/13.5R15 Super Swamper IROK's, Dana 30 Front, Tube Diff Guard, Dana 44 Rear, 4.56 gears, Ox Locker, disc brake conversion
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Unread 02-12-2012, 07:25 AM   #6
JeepComanche89
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1989 MJ Comanche 
 
Join Date: Jan 2012
Posts: 2,403
I am almost 100 percent sure its a 44. I compared it with a rear end chart and thats what it appears to be, a sideways apple with a steel drain plug and 10 bolts. I cannot post pictures yet but I would. As for the Caliper mounts everything appears to be the same thing as stu has. I ordered the retaining plates he mentioned based on the part number he gave and they are a perfect match to the grand cherokee mounts , but not the axle flange.
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Unread 02-12-2012, 07:30 AM   #7
JeepComanche89
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I do not have axcess to the part number of the caliper mounts from the grand, but here is the part number for the retaning plates which match the mounts perfectly 5083678AA. I orded them from morris 4x4.
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Unread 02-12-2012, 08:50 AM   #8
Garvin
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1986 MJ Comanche 
 
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Location: Wrightstown, New Jersey
Posts: 312
Not sure exactly what you tell you at this point. If you could snap some pictures, that'd help tremendously. From everything I've experienced and read, assuming your Dana 44 is the factory one, then the '95-'98 (even '94 apparently) brackets will bolt right up to yours.
__________________
[B]1986 Jeep Comanche 126000+ miles[/B]
Long Bed, Chevy 350 TPI (5.7L V8), AX15, NP231
Roll Bar, 15/38.5R16.5 Ground Hawgs, Bastard lift (Custom 3-link long arm system, 4.5" Rusty's front springs w/ 1.75" spacers and 6.5" RC shocks, SOA rear), Dana 60HP/Sterling 10.25, 4.10's, Recessed winch, more mods to come...

[B]1992 Jeep Comanche 174000+ miles[/B]
Short Bed, 4.0L I6 HO, AX15, NP231
In the process of doing a frame up restoration.

...RIP...
[B]1990 Jeep Cherokee XJ 207774 miles[/B]
4.0L I6, AW4, NP231. Tom Woods SYE and Drive Shaft, Rusty's 8.0" Long Arm Suspension Lift, 36/13.5R15 Super Swamper IROK's, Dana 30 Front, Tube Diff Guard, Dana 44 Rear, 4.56 gears, Ox Locker, disc brake conversion
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Unread 02-12-2012, 09:05 AM   #9
JeepComanche89
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1989 MJ Comanche 
 
Join Date: Jan 2012
Posts: 2,403
Thanks for your help so far, like i said im unable to post pictures. Im going to try and see if i had put the wrong mount on the wrong side of the axle now like you had said.
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Unread 02-12-2012, 12:05 PM   #10
JeepComanche89
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1989 MJ Comanche 
 
Join Date: Jan 2012
Posts: 2,403
Ok the retaining plates part number 5083678AA do not match up to my axle flange no matter what way they are turned. I took some measurements of the bolt holes on my axle flange and the holes measure 3 1/4 across and 1 7/8 apart. I looked into a thread on NAXJA of a crown vic rear disk conversion and the Crown vic mount looks a whole lot similar to my originals then the ones from the grand. Any ideas?
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Unread 02-12-2012, 03:00 PM   #11
Garvin
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Join Date: Feb 2005
Location: Wrightstown, New Jersey
Posts: 312
The Crown Vic has the Ford 8.8 rear. I put a picture below of the axle covers, might help with making sure you have the 44 in back and someone didn't swap in the 8.8.

Were the axles bolted in on the outside or is there a c-clip in the differentials that hold the axles in?
axle-chart-sizes.jpg  
__________________
[B]1986 Jeep Comanche 126000+ miles[/B]
Long Bed, Chevy 350 TPI (5.7L V8), AX15, NP231
Roll Bar, 15/38.5R16.5 Ground Hawgs, Bastard lift (Custom 3-link long arm system, 4.5" Rusty's front springs w/ 1.75" spacers and 6.5" RC shocks, SOA rear), Dana 60HP/Sterling 10.25, 4.10's, Recessed winch, more mods to come...

[B]1992 Jeep Comanche 174000+ miles[/B]
Short Bed, 4.0L I6 HO, AX15, NP231
In the process of doing a frame up restoration.

...RIP...
[B]1990 Jeep Cherokee XJ 207774 miles[/B]
4.0L I6, AW4, NP231. Tom Woods SYE and Drive Shaft, Rusty's 8.0" Long Arm Suspension Lift, 36/13.5R15 Super Swamper IROK's, Dana 30 Front, Tube Diff Guard, Dana 44 Rear, 4.56 gears, Ox Locker, disc brake conversion
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Unread 02-12-2012, 03:42 PM   #12
JeepComanche89
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1989 MJ Comanche 
 
Join Date: Jan 2012
Posts: 2,403
I do not believe that there is a c clip. To remove the axle shafts i simply unbolted everthing from each end and pulled. If I were to get grown vic or explorers backing plates and teraflex spacers would I be able to use my grand cherokee calipers? Thanks
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Unread 02-12-2012, 05:05 PM   #13
mp15dc
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1989 XJ Cherokee 
 
Join Date: Feb 2010
Location: Westlock, Alberta,Canada
Posts: 96
To use the grand cherokee backing plate, you have to slot or redrill the holes to match. Same with the new retainer plate. Im going to do the same thing to my dana44.
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Unread 02-12-2012, 05:23 PM   #14
mp15dc
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1989 XJ Cherokee 
 
Join Date: Feb 2010
Location: Westlock, Alberta,Canada
Posts: 96
The TJ dana 44 has a different bolt pattern then the XJ/MJ dana 44. I have 01 crown vic pads that fit the 96 grand calipers/backing plates. I didnt get crown vic parts as didnt want to change rims yet, heard u need more than 4" backspacing to clear the caliper on some wheels. Hope some of this helps.
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Unread 02-13-2012, 08:18 AM   #15
JeepComanche89
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Posts: 2,403
Yes that helps thanks. So do u have WJ backing plates that are redrilled? Can i use 95 to 01 explorer backing plates with stock rims or do i still need more backspacing
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