Built some twinsticks using some old D-18 sticks for my
Dana 300 , I sleeved the two shift rails, drilled a couple holes for bolts to fasten onto the rails, welded two studs for shift pivots and cut slots in both shifters.
Typically using old school sticks with a body lift would leave the sticks too short and hard to reach so I added some metal to raise the sticks 3”. The sticks shift effortlessly.
Twin sticking a CJ
Dana 20 isn’t a very popular option because there is no real benefit besides ease of shifting. Unlike the FSJ Pickups, Cherokees, and Wagons, that have a u-shape shifting pattern are able to use the front and rear axles independently. An added benefit on the FSJ and Bronco
Dana 20 is the slightly larger case so there is no need for grinding to install the larger 3.15 gears.
To gain independent use of the front and rear axles an owner of a CJ-
Dana 20 would need to remove the shift rail interlock pills (looks like 2 Tylenol pill) or be lucky enough to have worn pills. By removing the pills you stand the chance of binding and damaging the
Transfer Case by accidentally shifting the front in low and the rear in hi or vice-versa (the interlocking pills keep that from happening).
If I was going to twin stick I wanted the use of both axles independently but also wanted the safely of not binding the
Transfer Case especially when letting others wheel my Jeep. I decided to modify one of the shift rails enabling me to use the axles independently hi/low and still retain the pills.
Below are the two shift rails, detent springs and balls. I used a set of fuses to simulate the interlock pills. If you were looking down on the
Transfer Case the rails, springs, and balls would be at the bottom.
I marked the rear shift rail where I plan to remove some material.
I used a bench grinder and finished with a drumel.
I re-installed both rails in the shift housing without the detent springs and balls and there was no interference with the interlocking pills. I could now get low and hi in each axles independently.
