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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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    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
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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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    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

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  9. #25
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    Work is continuing on making the rest of the circuit functional for the jake brakes. I'm going to use a rotary switch to select between OFF, LO (2 heads), and HI (3 heads) and I'm going to install the switch in the water fording cable location. Removing the knockout plug revealed a 5/8"+ hole and the switch has a 1/2" diameter neck so I had a thin ring laser cut from 14 gauge stainless to act as a spacer.
    20191102_164026.jpg 20191103_101447.jpg 20191103_145207.jpg 20191104_171418.jpg

    The hearing protection sticker was going to interfere with the data plate so I scraped that off and painted over the brown paint behind the decal. I tested out the spacer ring with a 1/2" bolt.

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  11. #26
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    I almost gave in and went with the standard toggle switch but the data plates that would have looked the right vintage were going for $40+ on ebay for old scratched up data plates. Instead, I designed my own data plate that would look original and work with a 3-position rotary switch. I spent a lot of time comparing my current data plates, their layout, font styles and sizes, and spelling abbreviations and then I modeled exactly how I wanted it. With the model looking just right I sent it out to several data plate companies to get quoted and finally selected one who made several of them up for me. The data plate was inspired by the M816 flood light switch plate.
    20191029_061930.jpg 20191029_061122.jpg 20191005_171844.jpg 20191105_164256.jpg

    This data plate is the most exciting part about the switch and now that it's finally in hand I can mount it up!

    20191104_171852.jpg 20191105_163335_001.jpg 20191105_164333.jpg 20191105_164658.jpg 20191105_164609.jpg 20191105_164635.jpg
    Last edited by US6x4; 11-07-2019 at 00:39. Reason: Spelling

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  13. #27
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    Here is what I'm thinking for the wiring from the switch to the jake heads.
    20191107_172132.jpg

    I've never worked with diodes before but they're simple and my buddy the electrical engineer says they'll work all day everyday and this is a simpler way to do it than with relays. All 4 of the wires that terminate at a common jake head connection get a diode to prevent back-feed but the third head just gets a plain wire. The instrument cluster harness is a neat way of splitting power without having a bunch of wye connectors stacked up.

    All these little details keep me occupied while I continue searching for these white unicorn 425A jake heads...

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    I'm not seeing where the grenade shifter switch ties into all this.
    Motorpool:

    (Isn't owning one of this insanity enough??)
    1971 M813 "Ox" (named for Dewey Oxburger)

  16. #29
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    Quote Originally Posted by US6x4 View Post
    All these little details keep me occupied while I continue searching for these white unicorn 425A jake heads...
    I never looked for any:

    - Unicorns in other colors, blue, gray

    - Are THEY easier to find?!



    A1.jpg
    Last edited by Another Ahab; 11-08-2019 at 13:44.
    M35A2 w/Winch SOLD

  17. #30
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    Quote Originally Posted by Ajax MD View Post
    I'm not seeing where the grenade shifter switch ties into all this.
    The +12 volts coming into the rotary switch will come from a relay that is controlled by the grenade; battery-->relay-->rotary switch-->jake head

    So the grenade will tell the relay to activate the circuit and the rotary switch will direct the power on where to go.

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