Basically, If I had to to it over, I would not have ordered the shifter or boot kits from Herm, they would work great with a CJ or M38 raised floor, but the trans is too close to the floorboards on a MB/GPW for his shifter to fit without adding a giant boot. His shift lever also hits on the side tab of the T-84, which would require you to modify the shifter and/or cut the tab off the case.Notice how high the ATV shifter bracket would place it over the transmission. It also would place the lever about 1" back of the t-case shifter levers, even with the trans shifter.To use the ATV shifter would require thinning the shift lever and/or trimming the tab on the trans case
I will say that the ATV stuff is well made, though, as to workmanship and materials, I suspect that the lever is "universal" and the bracket and shift link are specially made to fit the T-84. The shift lever boot also is made to fit CJ's and M38s, the holes are in the wrong spots for a MB/GPW.
I'm working on a M38-A1 and noticed that the "In-Out" t-case shift lever is a good bit longer than the MB/GPW version, it might be a better candidate to make a OD shift lever which would place it up closer to the regular trans shifter.
A lever would not be too hard to fabricate from scratch. The pin on the t-case is 1/2" in diameter and there is about 5/8" space between the t-case shifter mount and the trans case.
The early GPW case, with the right side fill plugs does not have a reinforcing rib, the case would require a retaining bolt to be used with the extended pin. The shifter clears the fill plugs perfectly. This pic also shows that you could use the ATV shift lever to work with the pin mount.
Using a late "H" case required grinding a bit off the rear case side of the shifter to get free movement on the pin. In the pic below, you can just make out the slight grinding that was needed on the left rear of the shifter, near the rib and tab.
I had problems with end play in my "H" case trans causing it to pop out of third, so I reinstalled my mid series GPW case after freshing up the internals. The rib is a bit smaller and the unmodified shifter would probably have cleared the case fine.