I've got an freshly rebuilt R-151f just begging me to put this together.
For the record, I don't believe that the 151 is really any tougher than the rest of the R series, it just has the lower gears and came mated to the tougher 23 spline gear driven t-case. The R's are supposed to be stronger than the W's. I've heard people dispute that, but its generally based on "Well, my w56 hasn't blown yet, but my buddies r-150 did." as if that were some kind of scientific empirical evidence. Marlin says the R's are tougher, and that guy has probably forgot more about Toyota trannies the all of us put together will ever know!
Speaking of Marlin, he makes a couple small upgrades for these transmissions. I think his site is down right now, or I'd post links, but I can't find them to link them!
