After the recommendations with the hotshot runners I added more fluid to the NV5600. Went from 5 qts to 6 qts now. I cannot believe the difference the one extra quart did to the transmission. Shifts are reeeeaaaaally smooth now and low rpm gear rattle is pretty much gone. Mikey likey.....

MikeyB

 

I did that to mine but after a while I started having oil at the bell housing as it seemed to be leaking out the input shaft. I know it was tranny oil as that was the only purple oil (Royal Purple) I have in the truck. I pulled the fill plug and drained a bit out so it is closer to the fill plug and after a bit of time the leaking oil disappeared.

Not saying it is bad, just saying what I experienced.

 

Thanks for the info. I'll keep an eye on it.

MikeyB

 

Well this the first I've heard about overfilling. I run Redline MTL in mine and it did make it shift better but it still shifts hard. Think I will give this a try. Thanks and I'll let ya'll know what happens.

PS what exactly do the hotshoters say about over filling?

 

Additional fluid helps provide adequate bearing lubrication during grade climbing, plus the reduced gear rattle.

MikeyB

 

Added a extra qt.to mine last week(Amsoil MTL) and noticed less gear rattle also.

 

How did you all go about overfilling the tranny??? Jack the rear of the truck up or the drivers side of the truck up a bit???

 

I didn't jack anything up.Just pulled top PTO bolt and added.

 

Same here, through the top PTO cover bolt hole.

MikeyB

 

Wow! Now you guys got me wondering....So top PTO bolt hole...Now exactly how much to added above the normal full and any way to tell other then just measuring how much went in?

 

Using the fill/level check plug the capacity is around 4.5 quarts. I added another 1.5 quarts to make it an even 6.

MikeyB

 

I just added 1 qt.more through PTO bolt hole.

 

Thanks guys for the info. When I changed the fluid out a while back I could only get 4 quarts back in even with jacking the rear of the truck up. Taking out the top PTO bolt I was able to get about another 2/3 to 3/4 quart more into the tranny!!! I bought 5 quarts of Amsoil when I changed her out and now I only have about 1/4 quart left. So by my calculations, I got about 4.75quarts of Amsoil in there and whatever was left in there when I changed it. I didn't pull the PTO cover when I changed it, so I know there was some left in!!!

She shifts maybe a little smoother. Not much difference at all.

 

I overfilled mine by removing the console in the floor, after which I then took out the shift tower. You can see right down in the tranny. There is absolutely no spillage this way.

 

I put in another qt. (total of 5.5) on Sat. - what a difference! Too bad DC can't figure out this high tech stuff. Craig