I have been reading as many 5spd posts as I can but am still having trouble making a decision. As of right now I have the 2F adapted to a SM420. Very low, very nice for crawling around, but now my rig is becoming more of a daily driver and I could use an overdrive gear. I have looked into the H55, the NV4500, and some others, and would like the opinions of some knowledgeable people about which to go with. Since I already have a GM tranny in there would it be easier and more practical to go with another GM 5spd, or would it be better to go back to a toyota unit? Are there any other recommendations? Which is the best place (i.e. cheapest) to get either tranny? Thanks for the input.