Engine/Transmission (1998.5 - 2002) Hard shifting NV-4500

[CNorthrup]

I have a 99 1 ton dually that I changed the transmission lube in, within a week it started grinding going into third and fourth going up, down shifting grinds into fourth and is impossible to get into third without coming to a stop. I bought the mopar lube for it. The truck has 70k on it. What would cause this to happen so quickly?! I now shift without the clutch. I bought the truck from a friend of mine who took very good care of it. I am assuming that it is the syncro's gone bad. Any info will be a help. Thanks. Also how do you get your info on the bottom of the page?

 

[Turbo Tim 1]

There is a different lube for the NV5600 than for the NV4500 are you sure they gave you the right lube?

 

[CRead]

I had a 97 GMC 1 ton with a NV4500 at work do the samething. The truck only had 84,000 miles on it and the factory oil in it. I took the trany out in about 1/2 hour had GMC go through it and they said the only fix was to rebuild it. It cost about $1600 and a morning to put it in. If it was mine I would talk to Standard Transmission and Gear, ATS or Bluemental heavy duty. Look in your TDR for there numbers. Good luck.

 

[Supermod56]

Double check the type of fluid you put in it, I run Redline MT90 in mine, it really likes it, but the correct Mopar lube works great also. The 4500 uses a slightly thicker fluid than the 5600, if it isn't that, I would look at the pilot bearing hanging up, fairly common on these things.

Tom

 

[CNorthrup]

Thanks for the reply. On the bottle's I got from mopar it says it's for the NV4500 so I asume it is the right lube. Even though it seemed a little thin. It just seemed strange that it would happen that fast after doing a fluid change. I was planning on doing a rebuild myself, I found a kit on ebay for $180. Don't know what the quality is but it's about half the price of everwhere else I looked. Thanks again.