NV 273D Transfer case rebuild...

[Mathes308]

I too have been running AmsOil ATF in my transfer cases.
The power steering, transmission and transfer case all get it.
Never had a problem yet, then again they Amsoil is a quality synthetic so it may be protecting where others fall short.

I used to have problems in the winter with the transfer cases not wanting to shift, they would stick or be hard to sync. Ever since the switch to Amsoil atf they have all been flawless.
I'm in backwoods PA so they see 0 degree winter to 90 summer and 4wd is used year round from snow to hauling wood. I actually use it to get up my dirt road because the cummins is so heavy the rear just spins too much
Not saying the blend is a bad idea, just not sure the Amsoil ATF only is either.
Just my pennies.

Though I have thought of blending something a little tackier in there....

 

[amsoilman]

ATF has been used for many years in Transmissions as well as Transfer Cases. I purchased a 1962 Plymouth Valiant new, and it had a 3-speed Transmission that required ATF! My belief is to use the proper specked lube for the application! ATF is around a 20W fluid, and if you use a high quality ATF like AMSOIL, you should never have a problem from caused by lube!
Here are the Specs. for the AMSOIL Synthetic ATF. Notice the "POUR POINT" and the "FLASH POINT", as well as the 4-BALL wear test!

TYPICAL TECHNICAL PROPERTIES
AMSOIL Signature Series Multi-Vehicle Synthetic Automatic Transmission Fluid (ATF)
AMSOIL Signature Series Fuel-Efficient Synthetic Automatic Transmission Fluid (ATL)
ATF ATL
Kinematic Viscosity @ 100˚C, cSt (ASTM D445) ... ... ... ... ... ... . 7.5... ... ... ... 5.9
Kinematic Viscosity @ 40˚C, cSt (ASTM D445) ... ... ... ... ... .....38.5... ... ..... 28.5
Viscosity Index (ASTM D2270) ... ... ... ... ... ... ... ... ... ... . 165... ... ... ... 159
Pour Point ˚C (˚F) (ASTM D97) ... ... ... ... ... ... ... ... ... -53 (-63)... ..... -53 (-63)
Flash Point ˚C (˚F) (ASTM D92)... ... ... ... ... ... ... ... ... 234 (453)... ... . 224 (435)
Four-Ball Wear Test (ASTM D4172 @ 40 kg, 75˚C, 1200 rpm, 1hr), Scar, mm. . 0.40... ... ..... 0.40
Brookfield Viscosity @ -40˚C, cP (ASTM D2983)... ... ... ... ... ... ..... 9755... ... ..... 9015

 

[DaveHess]

Cerb, just to simplify this thread for me. I live in North Dakota where we see short periods of sub-zero temps in the winter and I use this pickup mostly in the summer heat towing a travel trailer. I have the old style lever in the cab to engage the 4WD. Your recommendation would be the Synchomesh for a guy like me? I want protection for me T-Case. And the dumb question, is Synchromesh a brand or type of fluid made by different manufacturers? Thanks in advance.

 

[cerberusiam]

SyncroMesh is type of fluid made by Pennzoil. Amsoil and Valvoline have their own brand of the same thing. If you are using the truck predominantly in the warmer months I would not hesitate to use the 50 wt Delvac. The Syncomesh fluid is roughly a 30 wt fluid and is meant for a manual gearbox and lots of shifting. The 50 wt Delvac is for the same type of trans only heavier duty. Ckelly1 is running it in his fleet in the high country of New Mexico, sounds like a good reference to me.

 

[NIsaacs]

The only reason the pump is there in the tcase is because the lighter lubes will not stick well enough so they need a pressure feed to lube properly.

The pump is the most important part in a t-case, especially with free spin hubs/lock out hubs. Keep in mind the oil level is below the input/output shafts, bearings and planetary. That means if the chain is not turning there is no oil being pulled to the top to splash/lube anything on the top half. At least with a normal locked or half locked front axle the chain does turn some and can help lube the top.

The t-case is not a transmission. In 2 wheel high it is just an expensive carrier bearing, no torque or stress on anything so heavy oil is really not needed and due to the pump, it might not be a good idea for some areas.

Change the fluid often so it is always clean and keep it full.

Nick