Engine/Transmission (1998.5 - 2002) Trans fluid change.....

[Sarge]

I plan to change the fluid in my NV5600 soon, so I crawled under to take a look. The hex head plug appears to be about 2 inches up from the bottom on the drivers side. How do you get a complete drain? Other than pumping it out, do you pull a PTO cover to drain it? Any advice is appreciated. Thanks, Sarge

 

[amsoilman]

If it is anything like the 03', and I think it is, just remove the lowest bolt on the cover and let it drain out. I just recently done this on my 03' CTD.



Wayne

amsoilman

 

[InThinAir]

Just did that a couple of weeks ago

My advice is to park the truck out of the way because I left it overnite to allow the RTV to cure before I added the lube.



To change out the Lube take off the driver side PTO cover. Start with the lowest bolt and let it drain for a while. Once it is drained pretty good remove all the bolts and pry the cover off. With the cover off wipe out the bottom of the pan until you are able to find the magnet. There has been some discussion on this, but my magnet was a flat 1 or 2 inch square about 1/8 of an inch thick. Clean that off and replace. There is no real reason to take off the passenger side, unless you have a leak or just want to redo the seal, because you can't really clean anything from that side at all.



Once you are satisfied with how clean it is then seal it up with RTV and let it cure. The fill plug is a 17 MM hex and I used a drill powered transfer pump with a couple of feet of hose.



To get 4. 5 qts in I added 3 qts and then drove it to position the truck on a nose down incline on the driveway. Then I added the last qt and a half.



What lube you put in is another story. The sticker on the cover is very specific.



Good luck

---Doug

 

[TomGolden]

InThinAir is 100% correct in how to do the change, especially on letting the RTV, when you replace the PTO cover, dry for a good length of time to avoid leaks.



One other thing to do if you don't mind parting with ~$200 extra to BOMB the transmission - Fast Coolers These add an extra quart of fluid each to your transmission. They also actually do help keep the transmission fluid cooler. I have temp gauges in both my 6 speed (the Fastcoolers come with one of them pre-drilled and tapped for a 1/4" NPT temp sensor) and in my rear differential. When the truck is moving, the transmission is usually 15 - 20*F cooler than the rear end according to my SPA gauges.



Tom

 

[InThinAir]

Hey Tom,



On the FastCoolers, does the transmission get very hot? Didn't I read somewhere in here that the NV5600 runs really cool already?

Here is the post



https://www.turbodieselregister.com/forums/showthread.php?s=&threadid=64872



I definitely see an advantage to increased capacity of the fastcooler but I don't know if it needs to cool anything down. I'd love to hear your input.



---Doug

 

[TomGolden]

Doug, everyone,



I live in northen California, temps this time of year range from ~30*F first thing in the morning to ~60*F in the afternoon (I'm talking air temps, not transmission temps here). In the summer, air temps range from 60's to 110*F.



This time of year, my transmission temps never get over 110*F, in the summer, I think they were running about 160*F at the highest. This is running empty though. I don't tow anything, and rarely haul much weight, so realize that if you tow or haul often, temps would of course be higher. I believe I remember reading on past TDR threads that transmission temps (for manual trannies) are safe under 210 - 220*F... .



My rear diff temps are usually ~15*F higher than the transmission, as I said earlier.



Tom