Transfer Case Cooling Idea

[Nailhead]

best help to cool it down I,ve found is synthetic lube 85-140 and the drive shaft relocation kit bj,s sells. jmo

I'm running Amsoil 85/140, which has had NO detectable beneficial effect on t-case temp: still too hot to hold a hand on after a few miles at 50 mph.

[Barrman]

With Mobile 1 in mine I hit over 270° case temp. That was with the drive shaft relocation. Of course, I was running the 396 at 2500 rpm in over drive going around 67 mph for an hour when I smelled the oil and decided to check. I keep it at or below 54 mph now. 2500 drive shaft rpm with the 11.00 tires or 48 mph stock tires.

I have a NP205 ready to go but am just too lazy to do the swap. Other have had good results with a complete rebuild of the 200. If you have a transfer case that gets hot, those two options of either rebuild or replace seem to be the only for sure cures.

[kwai]

Add changing the axle gear ratio as the 3rd cure.

[Mikel]

I have two NP200s, one in a vehicle with 4.10s and the other with 4.56's. I get an annoying chattering noise in both at light throttle while on the highway, but they've never overheated.

[Subybaja]

I have two NP200s, one in a vehicle with 4.10s and the other with 4.56's. I get an annoying chattering noise in both at light throttle while on the highway, but they've never overheated.

Tire size/RPM?

[Nailhead]

In the course of replacing my transfer case rubber mounts yesterday, I noticed one reason my t-case gets hot: the exhaust pipe passes within about 1/2" of the top corner of the case. Looking around, I couldn't see any other way it could be sensibly routed, and the pic I looked at in the OMM section shed no light on factory exhaust pipe routing.

[Mikel]

Tire size/RPM?

37" tires. Engine RPM on the highway is about 1800, so about 2200 RPM thorough the transfer case.

[Barrman]

The exhaust does come that close. But, that far from the engine it probably won't be over 200° or so. Depending on load, outside temp and such of course.

[Nailhead]

The exhaust does come that close. But, that far from the engine it probably won't be over 200° or so. Depending on load, outside temp and such of course.

Thank you. I won't worry about it, then.