NP 200 oil cooler?

[plumas.placer.miner]

I have heard that someone has found a passive oil cooler that bolts to the PTO flange on the NP200. Do any of you think that would work to keep temps down?

I know that they make 'em for some t-cases, like this:



It's about 3 hours of driving to my claims in the M715, and the first two hours are highway hours (45-50 MPH) and some real hills. I can see (and smell) the overheating NP200 coming.

I don't want to install a pump and run lines.

[TJinSD]

I have heard that someone has found a passive oil cooler that bolts to the PTO flange on the NP200. Do any of you think that would work to keep temps down?



I know that they make 'em for some t-cases, like this:







It's about 3 hours of driving to my claims in the M715, and the first two hours are highway hours (45-50 MPH) and some real hills. I can see (and smell) the overheating NP200 coming.



I don't want to install a pump and run lines.

I have wondered about cooling fins, too. Not sure how to try some and keep my PTO winch.

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[jeepdan]

I thought that the PTO unit is mounted on the side of the T98 transmission, and not the NP200 transfer case.

[TJinSD]

I thought that the PTO unit is mounted on the side of the T98 transmission, and not the NP200 transfer case.

Oh, duh. Of course it is.

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[plumas.placer.miner]

I have read on other fora that some people just put extra oil in the T-case, and that solves the overheating problem.

I dunno though...My Gramps was a Ford mechanic and he always told me that too much oil is worse than too little oil...up to a point.

Others just say to get used to the idea that the NP200 overheats at highway speeds...period. If I don't like it, change to the NP205. I think I read that on this forum somewhere.

Some on other fora said that AT Fluid is best used in the T-case, while others recommend 50 wt oil. I used the 85-90 gear oil, but I can't say if it overheats because I haven't driven more than 4 miles yet. I know...that sucks.

I'm trying to get in front of the T-case overheating issue, if possible.

[bmac6026]

try Charles at :

http://www.mseriesrebuild.com/index.html

he at one time was offering some type of cooler

[Nailhead]

I took mine on a 300-mile summer road trip a few years back, and had no issues with T-case overheating, but I almost never exceeded 50 mph indicated, and I have Amsoil 75-110 oil in it. Exhaust heat got the floor hot enough to melt a plastic tool case, but the transfer case (with that exhaust right next to it) worked just fine.

Based on my experiences with a diesel-converted M37 running the same t-case & 4.89 gearing & this truck, I also believe avoiding heat-related issues with the transfer case is all about keeping drive shaft RPM below a certain figure: I could drive that M37 all day long at 65-70 with no problem because of its taller gearing, and 50 works fine in the M715 with stock gearing. It might put up with a higher speed, but I’m not interested in trying it.

[Don Cavey]

I wonder if my truck in Germany had a warm NP-200 after this trip on the Autobahn? Yes, the speedometer was wrapped up rather tightly.