Farmall H Tranny Tricks

Someone told me that there was a certain model 3 speed tranny that would bolt inside the torque tube of my H, taking the place of the driveshaft, giving me the option of low or high speed gears depending on track conditions. He did not remember the type at that time. Has anyone heard of this and/or know which tranny it is? I am still building my new puller and cannot afford the money for the low-low gears, but if this works out, it would give me the best of both worlds, only I would have to pull the block-off plate to shift it is all.

a guy that used to pull with us had a 3 spd. in the torque tube, he was using it to get real slow gears on a low hp engine, my intent would be to use it in a higher hp H to split up 2nd and 3rd

Probably a Sherman transmission seen
them in A-C wd and wd45. Also in Fords
and Fergusons.

A year or two ago ChadS talked about a S10 chevy trans in an H or was going to try it. It would be in the torque tube. not sure how he was going to shift it or if it would fit and work.

I've been told.something about using a planetary reduction
out of a automatic GM transmission but I don't know how its
set up but would like to know.

ChadS and I were discussing that idea, but I don't know if he ever tried it or not. I had the S-10 Isuzu 4-speed, and it looked as if it would fit. Idea was to use a clutch disc with the spline pattern for the transmission, but the proper diameter to use with the H pressure plate/clutch cover.

I got the idea from someone who put a GM 2.8 liter V6 in their H...they had installed a similar transmission in the torque tube, with a bolt in the shift rail on the S-10 tranny to hold it in 2nd gear...which was right at a 2:1 ratio. [The "extra" transmission was NOT shifted, once installed.]

That essentially gears down a higher-speed engine to more closely approximate the ground speed the H originally had...and, on a low-torque engine like the 2.8, it gives a 2:1 torque multiplication going into the H transmission.

To add the S-10 transmission on a "stock" H, you'd be doubling the torque going into the tranny...and don't forget, the original 460 essentially used an H rear end, durability-wise, and they originally weren't stout enough to hold up to the C-221 six. Caveat emptor, as they say.

My advice, then, is to take these small nuggets of information, and see if they mean anything in your situation. They may, and they may not.

Did that back in 98 on Something Wilder.

The gearcase I have, wasnt from a S-10,

Datsun maybe??

It was a 5 speed, used to get a gear between 4th, and 5th.

Right around 13 mph at stock rpm.

I had forgotten bout that,,,,,,,,,, Still got that thing!! Chad

(quoted from post at 15:59:57 05/03/11) Did that back in 98 on Something Wilder.

The gearcase I have, wasnt from a S-10,

Datsun maybe??

It was a 5 speed, used to get a gear between 4th, and 5th.

Right around 13 mph at stock rpm.

I had forgotten bout that,,,,,,,,,, Still got that thing!! Chad

Click to expand...

So, if I read all these right, I am simply looking for something that will fit inside the dimensions of the torque tube, and can get a disc for it that will also fit inside the H's 10 inch clutch?

Chads, how did you hook yours up on each end, and how did you secure the tranny inside the tractor?

Thanks for all the help guys, I am trying to build this H right for a first gear class yet do it on a VERY tight budget!

Took the factory H driveshaft and cut it in half.

The input shaft of the "overdrive" was removed and turned down in a lathe to a smaller diameter.

Then I drilled the center out of the H input shaft and slid it over the other one. I think I pinned it up front and welded it at the back to hold the two shafts together.

Just used all the coupler parts from the H and graphed them over to attach to the little hub that the overdrive had.

The unit held in place by a bracket made to fit the old bellhousing bolts and then attached to the belly pump holes in the torque tube casting.

The stub shifter stuck out the bottom of the housing which was all you saw at first glance if you seen it at all.

Used it to split 4th and 5th on my puller,,,, but when it was in low low,,,, it was slower than molasses! Even the creeper gear H we got out ran it!! lol. Chad

If your building your tractor for a first gear class. why dont you just put it in first gear and pull it. Most tractors have stroker engines and have more power than they need. If you have a good running engine just put it in low gear and pull Dyno it and get the power at the low end. See what you have first and then make the adjustments that are needed. Call and talk to some of the people who have good running H Farmalls before you waste a lot of money.