Posted by Matt Wilson on Tuesday, January 30, 2001 at 0:01AM :
In Reply to: T-case as overdrive posted by Don Scott on Monday, January 29, 2001 at 1:23PM :
If you turned around the t-case in a Power Wagon, you'd have your output shaft going 1.95 times as fast as your input shaft coming from the transmission (whenever you put the t-case in low range, that is).
Driving in 1st gear with the t-case in low (or high, as it would now be) would be approximately like driving in 2nd gear in the stock configuration. Second gear would be approximately like 3rd, and in 3rd, you would effectively have a 0.86 overdrive. You would probably have to spend all your time driving in 3rd. Fourth gear would be out of the question, as you'd never have enough power to overcome drag, as long as your t-case was in low (high).
If you spend all your highway driving with the tranny in 3rd and t-case in low (high), I don't know if the transmission would hold up over the long haul. I suppose a majority of Power Wagons have spent many thousands of miles in 3rd gear, crawling along the landscape, but my gut instinct says that it may not last as long on the highway in 3rd. Highway miles rack up pretty fast, while offroad miles are slow to add up. The thing about 4th gear is that the tranny has a direct link from the input shaft to the output shaft, with no power transmission going through any gears, while 3rd gear has two points of gear mesh under load within the tranny. I think some of these gears might not hold up over a long time.
It's hard to say, but it would be interesting to see how such a setup performs and holds up.
Let us know.
Matt
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