Need some suggestions on where to buy them online,cheap of course. I need the rear and NV5600 lubes to be specific, I spent way to much time looking for one bottle here, and one bottle there around town, I like to get 4 quarts of the same lube to change the rearend, that's not possible with local stores.

 

for the front and rear diffs, any gl5 rated 75w90 synthetic will do [mobil1 seems popular]

for the transmission, dealer if you have a good one is ok, or napa for penzoil/quakerstate syncromesh fluid.. redline mtl or amsoil mtf also good...

7qt for the diffs should be good, 4.5qt for the trans iirc?

oh, the nv5600 uses the same fluid as a nv3500... gm used that in their 1500's before, so they could also be a source for fluid [the correct # mopar fluid is marked nv3500 on the bottle]

 

Seems like most people have the best luck with penzoil syncromesh. Overfill your 5600 by about a quart, seems to help with shifting and smoothness.