Well today I did a little more inspection of the Auxiliary Trans.
The casting on the front of the aux. trans is the same as the casting for an enclosed drive-line. I did comparison an test fit the splines.
All you have to do is have an old SM420 enclosed drive-line laying around (which I do). Use the rear trunnion (U-joint assembly)from an enclosed drive-line. And have two rear yokes from an open drive-line. One for the front input shaft of the aux. and one for the rear output shaft. Which I have.
Oops, almost forgot move the Speed-o cable drive to the rear of Aux Box.
Remove the ball joint housing from the enclosed SM420 or the bearing retainer from an open drive-line SM420. Replace with the front casting off the Aux. Trans. Connect the Rear trunnion back on the SM420 output shaft with a bolt and washer, then using a standard U-joint connect one of the Yokes and the trunnion together. The yoke floats free on the input shaft of the Aux. Trans. With new gaskets reassemble the SM420 and the Aux. Trans.
Install as one complete unit assembly as shown in the last picture I loaded.
Oh yeah the rear of the Aux. Trans needs a bearing or drive-line hanger. This thing has to be well supported. even through it only weights 95 pounds. The casting are not that strong to support the weight.
I was going to put a Clark 5 speed in my 1Ton. It has the long wheels base with a 12 foot factory flat bed and 18 inch dual rear wheels. But I would still only have direct drive in high gear.
Now by adding the Aux. Trans instead I will have an overdrive for puttering down the road. Now to figure out exactly what the actual Gear rations are, but no hurry there.
I only wish I knew who made the thing, I am hoping someone out there with a lot old Chevy truck service manuals runs across this thing.
All is well in Paradise.
All Hail Klaatu and Gort
Last edited by GMCPic; 10/31/2013 9:50 AM.
