RE: TRANSMISSION OIL
Mike. . .the answer is yes. I've seen pictures of a 5600 where the wrong oil was used and the bearing races were shot, bearings themselves were pitted, and the syncros were shattered.
then on top of that, New Venture Gear is no longer in buisness, New Process bought them and the patents they held when DC moved from NV to the G-56. long story short, parts for the NV35, 45, 56, and other trannies are in shorter and shorter supply. the only way to keep the tranny happy is to use the correct oil that is specified.
now in the next 2K or so miles I'm gunna need to change all the fluids. I have a source for all the AMSoil oils I need for a good price so I'll be able to tell how much different the AMSoil is over what I'm useing now.
I already have AMSoil in the engine of my taco and I can tell a little difference in the way the engine runs. I like it and will probably continue useing it.