Ummmm... With all due respect to your friend, the IH Torque Amplifier was no Dual Power; not even on it's best day. I understand your thinking, but I think i'd fix the DP and it should be quite reliable for many many years to come. There's a lot to be said for doing a major job on it as was suggessted in the previous thread; doing it right, and then it's done for a long time. The torque amp could be fixed.... and fixed.... and fixed, and the darn thing still wasn't right. Ford and Deere in my opinion had a much better design.
In theory, if you do decide to eliminate the DP, all you must do is lock the underdrive clutch... mechanically. That's done by adding another plate or shims to the clutch pack to displace the normal piston travel. That's a cheap nasty way of doing it anyway, but it does leave you with a slow dog of a tractor that will only travel about 14 mph top speed. I wouldn't want that. If you wanted to go right to town you could probably scrounge salvage parts to close the housing back in and turn it back to a conventional 8 speed. That should maintain t's direct drive transmission ratios and you'd have full speed that way. I still think you'd find it easier and probably cheaper to fix the DP, and then you'd have a tractor instead of half a tractor. That's just my way of thinking....
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