I contributed much of the aux-trans. info and photos that are running at Cletrac.org Oliver offered, as an option, an aux. transmission kit that consisted of a modified Ford Model A three speed transmission and a custom made clutch housing made by Trasco in California. Zimmermans in PA usually has complete (used but rebuilt) kits for sale. If you make it yourself, some improvements can be made. The original kit did a few things that don't make sense to me. The Ford trans. input shaft is changed so the original Cletrac 9" clutch disk is retained. In the setup I made, I left the trans. in original condition and used a new 9" Ford Model A disk instead. They are cheap, spring-loaded instead of solid, and available cheap. Also, the original Oliver-Trasco kit required welding some of the original driveshaft components together, and once done, a lot of work was required to remove the driveshaft, aux. trans., etc. In my setup, a new fabricated driveshaft comes apart sideways in minutes. I can pull the aux. trans. out in half and hour if necessary (for clutch replaces-ment, etc.). After installing an auxiliary transmission in my HG, it’s hard to imagine how I used it
before the modification. It’s a night-and-day difference. The little Cletrac crawler, in
first gear(without the aux.) and full throttle travels at 2.01 m.p.h. That’s fast. With the three-speed
auxiliary transmission installed and both transmissions in first gear, the same crawler
travels at .64 m.p.h. It can push and tow with the engine almost at idle. Besides making
the crawler more useful, the lower gearing will enhance the life of the engine and the
clutch. Specs. for the HG or OC3 with the Ford Model A 3 speed transmission installed as an
auxiliary unit, ground speeds at full throttle are as follows: With no aux.1st - 2.01 m.p.h., 2nd - 3.19 m.p.h., 3rd - 5.24 m.p.h., Rev. - 2.33 m.p.h.With the Ford Model A three-speed transmission as an auxiliary transmission: Range 1: 1st - .64 m.p.h., 2nd - 1.02 m.p.h., 3rd - 1.68 m.p.h., Rev. - .74 m.p.h. Range 2: 1st - 1.08 m.p.h., 2nd - 1.72 m.p.h., 3rd - 2.83 m.p.h., Rev. - 1.26 m.p.h. Range 3: 1st - 2.01 m.p.h., 2nd - 3.19 m.p.h., 3rd - 5.24 m.p.h., Rev. - 2.33 m.p.h. Range Rev.: 1st - .53 rev. m.p.h., 2nd - .85 rev. m.p.h., 3rd - 1.4 rev. m.p.h., Rev. - .62
forward m.p.h.
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