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Thread: Comanche Rearend Rework

  1. #1
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    Comanche Rearend Rework

    Picked up a Comanche a bit ago, finally getting around to fixing it properly. The rear axle spring perches were buggered right up and the rear of the truck was an inch lower than the front end.
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    looks lower from the extra tires in the bed
    Truck with no extra weight in it
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    Keep in mind this will be my daily driver, so nothin' krazy yet.

    Truck is a 1986 Jeep Comanche 4.0L HO conversion 2wd-4wd conversion 7' Longbed with about 3" lift so far. Will be doing quite a bit of work over the next several years. Trim wheel wells, clearance back corners of bed, build roll bar/tire mount in bed, etc........list keeps going.
    Last edited by Herc; 12-01-2010 at 12:17 AM.
    94 YJ 5" lift with D44 35 x 12.5 on Steelies 4.0L 5 speed
    86 MJ 3" lift on 31" BFG's 4.0 HO 4x4 conversion - 96 Cherokee update
    More on the way
    OF4WD #6421

  2. #2
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    So here is the damage both spring perches neither one straight both bent up allowing the axle to rock back and forth. So figured while I'm gonna have it apart putting on new perches might as well do the springs at the same time.

    Here are the springs from the truck with two different options I was considering. Stock SUA or SOA and reusing the stock spring plates or replacing them with YJ spring plates and welding shock mounts on the rear axle. Using the YJ spring plates would net me another 2 inches of clearance under the axle.
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    Next question, leave the rear brake proportioner/valve connected or disconnect it.
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    So took the stock springs to a local shop to have em rearched and add another leaf into the pack, here's the end result for the springs.
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    Last edited by Herc; 12-01-2010 at 12:43 AM.

  3. #3
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    K so pulled the D35 out and had a look at it, Perches were F.U.B.A.R. forgot to take pics though so here is a couple on the truck
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    and the scrap perches removed
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    new perches tacked in place
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    the tiny little welder that just will not cut it
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    The slightly bigger welder used to weld the new perches on
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    Last edited by Herc; 12-01-2010 at 12:49 AM.

  4. #4
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    Now I am no professional but I surprised myself with my welds not the greatest but what are your thoughts???
    Will these welds hold up? will be installing back into the MJ tomorrow night

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    Last edited by Herc; 12-01-2010 at 03:48 PM.

  5. #5
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    Nice progress. I remember the truck well (since it used to be mine). Did a 4cyl engine swap in it, then sold the 4L/trans/tcase thats currently in there to the previous owner who did that swap too. I still miss it.
    Tri-City Jeep Club

  6. #6
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    I sure hope you mocked that axle up in the Jeep to get the correct perch locaton and Pinion Angle otherwise you will be cutting them off again and re-welding them back on... And that SP135 will be fine to weld that and many other things....

    I too know this truck way too well and It is nice to see it back on the road again or at least on it's way back...

    As for the rear Prop Valve I would leave it there unless your going to change the brake line from the Front prop valve to the rear flex line and if you do that you will need to change the front prop vavle as well...

    Good luck with the truck...
    Last edited by Jeepman; 12-01-2010 at 12:08 PM.
    1989 Jeep MJ: 4.7L Stroker, 4WD Swap, 97+Conversion, RC Long Arm Upgrade Kit, 35x12.5x18 Mickey Thompson MTZ's, WJ D30, WK SRT8 Rear D44 w/approx. 8" Lift
    1983 Jeep CJ7: SOLD

  7. #7
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    Yup have the proper pinion angle, thanks for checking. I'll drop by sometime with the truck, btw love the hood on your MJ

  8. #8
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    Nice work Herc! gunna be a nice machine!
    Strength is nothing more than how well you hide the pain

    Yer hot, wet, and extremely satisfying. You always put a smile on my face and yer the first thing i want in my mouth when i wake up....aaaaaahhhhhh Coffee, my only friend.

  9. #9
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    So have decided to leave it Spring under with the D35 and factory spring plates for now. Will change it to YJ spring plates and weld shock mounts onto the axle tube next year sometime. Will start accumulating parts and bits I need for upgrades over the winter. In the meantime have lots of small projects I will be doing over the winter on both my YJ and the MJ here. Should keep me busy!!

  10. #10
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    Quote Originally Posted by Herc View Post
    Yup have the proper pinion angle, thanks for checking. I'll drop by sometime with the truck, btw love the hood on your MJ
    Drop by Anytime...
    Oh and Thanks the Cowl hood Is very Sexy I know, and if you want one let me know...

  11. #11
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    Tanks Sarge, it will be when I'm done...........what am I sayin' it'll never be done. Anywho painted the bare metal/welds and just kept painting,(till I ran out of paint) was tired of the yellow cover anyways.
    Before Paint
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    After Paint bomb
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    Put it all back together, bled the brakes, reconnected everything and in the process found out I need longer shocks(they hold up the axle) and e-brake cables as well as flex line to the rear axle for the brakes. Not a necessity at the moment but will have to be done by spring. Untill then it will pull DD duty

    Will post up some pics after work Thurs while I'm going over the brakes, pads, hardware. The reworked springs gained several inches in height
    Last edited by Herc; 12-02-2010 at 01:01 AM.

  12. #12
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    look into a YJ rear flex line, thats what im using on my XJ

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  13. #13
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    looks good Herc.... keep up the good work and continue to post pictures.
    My latest project... Collection of Parts

    Other stuff... Building a doubler, D300 Flip kit

    Quote Originally Posted by Deadman 94 xj View Post
    "Coil springs are for ballpoint pens and pogo sticks".
    ебут раком

  14. #14
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    Well full brake job finished and found out what the noise was coming from the front end. Have to replace the Pass side wheel bearing/hub assembly, get that done Fri night (parts stores closed by the time I found this) and then that's it till next week on the go all weekend.
    Anyways here are a couple pics, still figuring out this new camera for night shots. Should get a couple better ones tomorrow afternoon

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    It's a little hard to tell from these night pics bu the rear is several inches higher and very stout!!
    Last edited by Herc; 12-02-2010 at 11:57 PM.

  15. #15
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    Looking great.

  16. #16
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    Well replaced the bearing/hub assembly and all is good....or so I thought. Have a thud, clunk in the rear and a clunk in the front now but only when hitting a bump???? Any suggestions?

  17. #17
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    Shocks...

  18. #18
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    Ok so with re arching the rear springs and the additional leafs I gained the height I was after, but as a side effect the axle moved forward. Yup now the rear shaft is hitting the t-case so..... will move the axle back an inch as the perches already have the holes available, I just have to drill the spring plates to match the change. Also thinking since I have to take off the u-bolts and spring plates might as well just swap it over to the YJ plates and weld on the shock mounts now!! Still looking for the reason for the clunk in my front end.
    Would 3/16 steel be good for the Shock mounts?? I was thinking of doing a u-shaped attachment for strength, or two straight tabs, then weld a flat plate across the top and flat to the axle?? Thoughts.....suggestions?!?!? All welcome

  19. #19
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    ^ .....LOL ..... How did I know that was coming!!! The cutting and such will progress come spring, once I have the work done on my YJ. I think I see what you're gettin at with the spring perches and will look at that and see, the reason I was talking about 3/16 steel is I have a sheet roughly 2x3 left over and could make some from that. Will look at both options and go from there. Oh and the tire swap may happen in the spring as well, will see how things go.

  20. #20
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    Working on the plan for shock mount relocation and will hopefully have it ironed out and ready to go in the next couple nights. Need my truck for this weekends projects

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