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Which transfer case can I use?

Discussion in 'CJ' started by paintboljon, Feb 13, 2018.

  1. Feb 13, 2018 at 11:49 AM
    #1
    paintboljon

    #1
    paintboljon [OP] New Member

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    I bought a 1986 cj7 that has a cummins 3.9 diesel
    they used a 700r4 and dana 300
    The front drive shaft is so close to the transmission pan it broke front drive shaft when it was put in a bind off road.
    What case could I use to give it more clearance?
     
    paintboljon, Feb 13, 2018
    #1
  2. Feb 13, 2018 at 12:14 PM
    #2
    OFFGRID

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    OFFGRID Well-Known Member

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    1979 Jeep CJ7, 258, TH350, NP208
    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.
    The 700r4 is known for this issue. Many people run a Dana 44 out of a 74-79 grandwagoneer in the front with late 70s ford front spindles for the correct wheel bolt pattern. If you want to run the 6x5.5 bolt pattern of the Gwagoneer you can always get a 5x5.5 to 6x5.5 adapter for the rear which will also give your rear axle the same width as the front. You have to outboard you springs in the front because the differential is set further to the right. This will also get the driveshaft out more giving clearance for the 700r4. You can also switch to a th350, but you would lose overdrive. Not advisable to switch from the D300 tcase because you will still have the same issue with almost any tcase you switch too.
     
    OFFGRID, Feb 13, 2018
    #2
    LYFZGOOD, aggrex and paintboljon[OP] like this.
  3. Feb 13, 2018 at 12:23 PM
    #3
    Prerunner1982

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    Prerunner1982 Well-Known Member

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    Maybe a tcase clock ring?
    Clock the tcase down a little more to get the driveshaft a bit further away from the pan. Would hurt ground clearance though.
    I don't have any personal experience here though.
     
    Prerunner1982, Feb 13, 2018
    #3
    aggrex and paintboljon[OP] like this.
  4. Feb 13, 2018 at 7:03 PM
    #4
    JKBob 25

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    JKBob 25 Well-Known Member

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    JKBob 25, Feb 13, 2018
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  5. Feb 15, 2018 at 4:46 AM
    #5
    paintboljon

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    paintboljon [OP] New Member

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    I have looked into clocking the transfer case, maybe that would help.
    Ordered part now I wait
    thanks guys
     
    paintboljon, Feb 15, 2018
    #5
    JKBob 25 likes this.
  6. Mar 31, 2018 at 4:37 AM
    #6
    paintboljon

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    paintboljon [OP] New Member

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    Well, I got the clocking ring and it did not help at all no better clearance.
    I purchased a turbo 350 with a np205 case thinking that would move it over but the front
    diff. position is too far Left.
    Still working on how to get this done
    Is there a front diff. that would help without going to the extreme of moving spring mounts?
     
    paintboljon, Mar 31, 2018
    #6
  7. Apr 1, 2018 at 7:49 AM
    #7
    OFFGRID

    #7
    OFFGRID Well-Known Member

    Joined:
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    Peter
    Houston
    Vehicle:
    1979 Jeep CJ7, 258, TH350, NP208
    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.
    Your th350 and np205 is the ideal setup. that is what i'm running on mine except i have the np208 with no issues. the cleearance is close, but no rubs.
     
    OFFGRID, Apr 1, 2018
    #7
    chris4x4 likes this.
  8. Apr 1, 2018 at 7:55 AM
    #8
    OFFGRID

    #8
    OFFGRID Well-Known Member

    Joined:
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    Messages:
    2,018
    Gender:
    Male
    First Name:
    Peter
    Houston
    Vehicle:
    1979 Jeep CJ7, 258, TH350, NP208
    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.
    You know. . . I wonder if when they installed the diesel engine if they had to move it more off center towards the passenger side to make it fit. This would have also relocated the tranny more passenger giving you less room for the drive shaft. You may have to upgrade your axle to a wider one if thisis this case and you want to get full flex.
     
    OFFGRID, Apr 1, 2018
    #8
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