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99 Grand Cherokee rear disc upgrade

Discussion in 'Grand Cherokee' started by Chillmo, Dec 4, 2017.

  1. Dec 4, 2017 at 2:20 PM
    #1
    Chillmo

    #1
    Chillmo [OP] Well-Known Member

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    03 grand cherokee loredo, 4.0 straight 6 Family jeep. Just keeping her running slowly upgrading parts
    My brothers 99 grand cherokee has rear drums. We were wondering if you can convert them to disc without changing the whole rear end?
     
    Chillmo, Dec 4, 2017
    #1
  2. Dec 4, 2017 at 3:16 PM
    #2
    chris4x4

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    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Why are you wanting to switch?
     
    chris4x4, Dec 4, 2017
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  3. Dec 4, 2017 at 6:31 PM
    #3
    Chillmo

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    Chillmo [OP] Well-Known Member

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    03 grand cherokee loredo, 4.0 straight 6 Family jeep. Just keeping her running slowly upgrading parts
    Why not? Drum brakes are a pain in the ass
     
    Chillmo, Dec 4, 2017
    #3
    JKBob 25 likes this.
  4. Dec 4, 2017 at 6:51 PM
    #4
    chris4x4

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    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Well, they last along time, and have plenty of stopping power. Not familiar with jeeps, but I know with Tacomas, you loose stopping performance when you change the rear drum brakes to disk.
     
    chris4x4, Dec 4, 2017
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  5. Dec 4, 2017 at 6:58 PM
    #5
    aggrex

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    aggrex Well-Known Member

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    IME drum brake maintenance gets easier each time it's needed. I expect some improvement in overall brake performance for all your expense and time to convert over to disc brakes. Check to see if a drum-to-disc conversion kit is available. In some applications the master cylinder needs replacement. Swapping the rear axle might be another way.
     
    aggrex, Dec 4, 2017
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    JKBob 25 and chris4x4 like this.
  6. Dec 5, 2017 at 7:54 AM
    #6
    OFFGRID

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    OFFGRID Well-Known Member

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    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    There is an issue with the set up then. Disk should always out perform drum. #1 culprit with this is that those that do the conversion do not change the master cylinder to a disk/disk MC. A disk/drum MC just does not have the force to squeeze the newly converted rear disk essentially making the front brakes do all of the work acting like you have no rear brakes.
     
    OFFGRID, Dec 5, 2017
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    chris4x4[QUOTED], JKBob 25 and aggrex like this.
  7. Dec 5, 2017 at 9:18 AM
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    Prerunner1982

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    Prerunner1982 Well-Known Member

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    From what I have found the bolt spacing for the backing plates is different on the WJ than the ZJ/KJ that are normally the go to vehicles for rear disk swaps.

    May be stuck with looking for a WJ with rear disk to swap on. JK rear disk may work? I don't know...... easier to find WJ parts to swap than JK though.
     
    Prerunner1982, Dec 5, 2017
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    JKBob 25 and aggrex like this.
  8. Dec 5, 2017 at 6:46 PM
    #8
    JKBob 25

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    JKBob 25 Well-Known Member

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    Very interesting. I did not know that. Thanks @OFFGRID.
     
    JKBob 25, Dec 5, 2017
    #8
  9. Dec 9, 2017 at 4:18 AM
    #9
    Chillmo

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    Chillmo [OP] Well-Known Member

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    03 grand cherokee loredo, 4.0 straight 6 Family jeep. Just keeping her running slowly upgrading parts
    Thanks for the help.
     
    Chillmo, Dec 9, 2017
    #9
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