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Torque loads makes sense.. it's not an efficiency issue but a durability issue. Still 0.50:1 overdrives seem strange to me...
GM had a 2.29 10 bolt in the 78up Monte Carlo with certain engines, I think the 305. (not the stock V6) They might have used it until they had the TH200-4R, or might have stopped earlier being so steep but it was out a few years at least. It is the lowest rear end ratio I am ever aware of having seen in any car, ever, from any maker. (I went hunting once for a super-OD'ed lugger without a tall budget of adding a gearvendors onto an existing 4 speed) I was planning to use one along with a TH200-4R and a 6.2 diesel in an El Camino. :P
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