I have NV5600 and to keep the temp in check in the 5600 I tow in 5th gear. This told that it is the strongest gear. Is there any problem driving all day in 5th?

 

I would only stay in 5gear if the was in hill country if you have some flat land and down hill I would use 6gear. If you will put on two gauges on your truck you could tell when to shift it.A Pyro and boost will tell you a Lot And save you money in the Long run==Good luck

 

Thanks for the info, do have EGT and boost gauges. I have 19.5 wheels and 3.73 rears so 5 gear is like 6 gear and 4.10s. Pulls real nice with comb in 5th. 23000# GCVW

 

Just depends. If the the truck lugs while in 6th yes go down to 5th. But as long as your not in the hills 6th should be fine. Just keep your boost up and your egt's will be fine.

 

I was more concern about the tranny. Does running all day in 5th hurt anything?

 

I dont see how it can hurt with the 19.5" 's you should be good to go,,,,

I sent you a PM,,, BTW

 

It's not going to hurt it running in 5th. Depending on the speed and rpms you might be able to gain some fuel economy by using 6th on flat terrain.

Also a good idea to add an extra quart of fluid in the tranny to keep the upper bearings well lubed.

MikeyB

 

Thanks MikeB. With the 19.5 I am running 2200 to 2300 rpm in 5th. Have the fast cooler and the extra oil 7qt total. The tranny temp max 190 when in 5th. Without towing 6th is great for crusing

 

Check your Private Messages

 

5th is direct (straight thru) so no power goes thru the countershaft. You won't hurt anything running in 5th, indefinately. The countershaft is still spinning and throwing the lube around. 190* is very good! Mine runs about 215 on a hot day, towing in 5th or 6th. Craig

 

Did you add a tranny temp guage???? what brand????

 

A sensor on each side, isopro analog and commander on the other. The drivers side runs about 5 to 8*F cooler. Have a fan / heat sink on the driver side, the exhaust is on the other side and there is no room with a 5 inch down pipe.

 

I drilled and tapped my diff and pto covers and put in immersed wells made from old rtd probes. Then I made my own TCs from bulk rolls of TC wire and ran them into the cab and put mini-connectors on the ends so I can plug them into my Fluke 52. Craig

 

What does your rear diff temp run while towing?