ummm. i think synchromesh is cheap for a reason.

 

I run Royal Purple Synchromax in my 5600

 

Any synchromesh fluid will work in the NV5600...Red Line MTL, Amsoil MTF, and RP SynchroMax to name a few. Pennzoil is considered a "factory replacement fluid" meeting the exact specs DCX puts out. You can also buy synchromesh fluid at the GM dealer for less than DCX.

Be forewarned, NV5600s are finicky about their fluids...what works well in one, may not work well in yours! in my case, RL MTL works the best, and RP SynchroMax was the worst.

As for the extra fluid...fill to the fill plug, install the fill plug, and add two more quarts through the top PTO cover bolt.

 

Im using Amsoil MTF in mine. Big improvement in shift quality over the factory fill. I pull the shifter to get the extra 2 quarts in.

 

does any one have any pictures of pulling the shifter?

 

ok, its done. i have got the front and rear oil changed transfer case, tranny(with 5qts.) engine oil and fuel filter. wow lots of work.