Re: TRANSMISSION GEAR RATIOS .

Posted by jdemaris on November 04, 2014 at 05:00:39 from (70.194.5.81):

In Reply to: TRANSMISSION GEAR RATIOS . posted by droom on November 03, 2014 at 19:33:41:

That's kind of like asking what horsepower to
tractors have? Need a few more specifics.

I put a 2nd aux trans in my Oliver HG crawler.
Used a Ford Model A trans for the job. Oliver
did the same when they sold factory aux trans
kits.

Keep in mind that many if not most automotive
transmissions lack proper support in front to
be used since they are designed to be plugged
into a pilot bearing somewhere. Ford Model A
is a common choice for an aux trans because it
has full support in front and is very rugged.

With the Ford Model A 3 speed transmission
installed as an auxillary unit, ground speeds
at full throttle in my Oliver are as follows:

Original: 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 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
froward m.p.h.

Actual reduction is 2.6 in 1st, 1.6 in 2nd. and
2.2 in reverse.

Compared to a John Deere 420 crawler:
1st - 7/8, 2nd - 2 1/4, 3rd - 3, 4th - 5 ¼

OC-4 (with hi/lo in high range) 1st - 1.5
m.p.h. 2nd - 2.4 m.p.h. 3rd - 3.3 m.p.h. 4th -
5.2 m.p.h. rev. 1.8 m.p.h.

OC-4(with hi/lo in low range) 1st - .8 m.p.h.
2nd - 1.2 m.p.h. 3rd - 1.7 m.p.h. 4th - 2.7
m.p.h. rev.-.9 m.p.h.

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