genuine mopar oil

 

I use amsoil in mine has really helped the shifting, trans has 738,000 miles on it and it is shifting great, might give it a try

 

Is it safe to put synthic in the G56?

 

It came from the factory with synthetic.

 

Pennzoil Synchromesh.

My NV5600 has only had the Pennzoil after the first oil change at 30k. May be over kill but change it ever 30k but want it to last the life of the truck. Have 113k now and it still shifts the same as when new.

 

I was having trouble with my NV5600 at about 215K miles. It was grinding when I shifted from 2nd to third and sometimes from 3rd to 4th, as if the synchromesh was going out. I drained the lubricant (I bought the truck at 208K miles and don't know what was in it before) and filled it with Penz Syncromesh. I overfilled it, as some have suggested on this forum, by about 1 qt, by filling through the top bolt hole in the driver side inspection plate. After about 100 miles the grinding stopped and has not reoccurred. I'm at almost 232K now with no issues. Some have said the NV5600 likes to be overfilled. I concur.

My dad has a 2001 with the NV5600. He is at about 180K miles and his shifting is much more precise than mine, which I account to the additional 50+k miles on mine. I sometimes have difficulty finding 5th gear and downshifting into 4th, due to shifter slop, but I just go easy and it eventually slides in.

I sometimes wish 1st gear and reverse were not syncro'ed in the NV5600 for just the reasons stated above. Sometimes it's hard to get into those gears, because the truck is normally stopped and both the transmission output shaft and the gears are stopped. If they are not meshed, you have to let out the clutch a time or two to get the gears to reposition and mesh with the output shaft gears (at least that's my theory). If they weren't synchro'ed, you could just let the gears bump a little and feel it slide in. If you shift into reverse or first while the truck is rolling just a hair, you can feel it slide into gear. By the way, all that is normal.

Give me the NV5600 over the auto all day every day.

 

Standard Transmission is now recommending Pennsoil Synchromesh in the G-56's after seeing lubrication starved internals. Overfill it by a qt also.

 

I use the mopar oil that was put in it when new change it at 30.000 miles