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Thread: Trick, functional jake brake grenade shifter

  1. #21
    Colonel US6x4's Avatar
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    I need to back up a step here. Before the grenade can go on the shifter, the swivel base that mounts in the top of the transmission and the rubber boot has to go on first since it can't fit over the grenade and the same goes for the canvas shift boot. Once those 2 items are on the grenade can be threaded on and since the main wire is poking out the top and not snaked through the hollow stem yet there is no twisting of the wire.

    20190807_155713.jpg 20190807_180721.jpg

    After the grenade is tightened then the loose end of the main wire can be inserted into the grenade from the top and plumbed through the hollow stem leaving a small loop inside the grenade as the wire goes up from the switch, bends into a loop and then heads down into the shaft. So no twisted wire and since I'm actually able to use G.I. 14 ga. Prestolite wire (which is way cool) it's a good thing that I don't have to twist the wires!
    Last edited by US6x4; 08-14-2019 at 17:15. Reason: Spelling

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    silverstate55 (08-14-2019)

  3. #22
    Colonel US6x4's Avatar
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    The wire exit hole on my shifter serves double duty as an anchor point for a ground strap since there is too much grease/oil & small contact area to rely on grounding through the shifter attaching points. I used a 3/8" fine thread grade 8 bolt that was 1/2" long and had the machinist drill a 11/64" hole through it to fit the 14 ga. prestolite wire. I used grade 8 to make up for removing some of the meat from the middle.
    20190808_155719.jpg 20190808_155711.jpg

    The bolt secures the ground strap with an external tooth washer and the wire is free to go where it wants. Of course the rubber boot has to be in place before the wire is plumbed and the strap is bolted down.
    20190808_160332.jpg 20190808_160418.jpg

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  5. #23
    Colonel US6x4's Avatar
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    Now everything is buttoned up and ready to install back into my truck. Since the canvas shift boot is already on the shifter and can't come off I have to put the tranny tunnel floor board loosely in place first and then lower the shifter into place. With the floor board loose there was just enough room to fit my arm under it to attach the set screw bolt for the shifter base, attach the ground strap under one of the 3/8" tranny cover bolts, and snake the wire up along the speedo cable? and up under the dash for later wiring.
    20190808_171209.jpg 20190808_164402.jpg

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    silverstate55 (08-15-2019)

  7. #24
    Colonel US6x4's Avatar
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    OK, this sick grenade shifter is now installed and looking good! It feels good in the hand going through the gears, but sadly I haven't had a chance to actually drive it down the road yet. I tested the micro switch function with a continuity tester from the wire to the shifter stem but I will need to check it again from the wire to the ground strap to ensure the paint isn't interfering with the connection. When I do get the jake heads installed and working hopefully I'll be able to update this thread with a video. Until then here are some pics of the final installation!

    20190808_172006.jpg 20190808_172041.jpg 20190808_172052.jpg 20190808_172158.jpg 20190808_173000.jpg

  8. The Following 3 Users Say Thank You to US6x4 For This Useful Post:

    Lonnie (10-13-2019), silverstate55 (08-15-2019), TheQuaker (08-14-2019)

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