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Thread: Th400 quadra trac swap

  1. #1
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    Th400 quadra trac swap

    I'm looking at buying a nice 74 j10 with a 360 and th400 with the quadra trac t case. I am wanting to swap the tranny and t case out and put a t18 in with a Dana 20 t case. What fabrication or other parts swapping would this entail? Rear axle, driveshafts? Any info would be greatly appreciated, lots of detail is great too, thanks!

  2. #2
    Thank you from BT ULTIMUS MAXIMUS STATUS tufcj's Avatar
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    You'll need a 360 specific flywheel. AMC V-8 engines are externally balanced, so flywheels are specific to displacement. You'll need the bellhousing from a Jeep truck or Wagoneer that has about a 6" spacer on the back. You'll need the pedal set (it should swap into the bracket under the dash) along with all the associated linkage and brackets. Clutch and pressure plate. The T-18/model 20 is considerably shorter than the 400/q-track so driveshafts are different. The q-track rear is offset, you could run it although the centered rear would be better for u-joint life. You'll want to add hubs to the front axle. You'll need to cut out the floorboard and install a cover plate with the correct boots for the 4-speed and t-case. The best bet would be to find the T-18/model 20 J truck or wagoneer and get all the parts from a single donor. Jeep CJ parts are different.

    The best solution might be a part-time kit for the q-track - if they're still available. It also provides a slight overdrive.

    Bob
    tufcj
    Last edited by tufcj; 08-19-2016 at 02:58 PM.
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  3. #3
    Bulltear forum member New to the forum
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    I appreciate all the advice and info! I actually just came across a 71 j4000 with a 360 and a 4 speed

  4. #4
    Thank you from BT ULTIMUS MAXIMUS STATUS tufcj's Avatar
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    The 71 flywheel won't fit the 74 engine. AMC made a change to the rear of the crankshaft in 72 to make the Mopar Torqueflite torque converter fit. In the trucks that used the TH400 there is a thin spacer pressed into the back of the crank for the GM converter. You will have to remove that before pressing in the pilot bushing. You could just swap the entire engine/trans/t-case and be done.

    Bob
    tufcj
    1969 AMX
    1967 Rambler Rogue

    If you need a tool and don't buy it...
    you'll eventually pay for it...
    and not have it.
    Henry Ford


    Vote for BULLTEAR on top4x4sites.com ===> VOTE BUTTON

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