Recommended - Transfer Case Fluid Change to 5W-30 synthetic motor

[56Nomad]

I just emptied my transfer case for the first time at 82,000 miles

The emptied original OEM fluid (measured at 1.75 quarts) looked and smelled good with no particles. There should have been 2 quarts of used fluid emptied.

Our transfer cases were manufactured by New Venture and it appears that over time the OEM fluid or Dexron III will evaporate and this causes premature wear.

I rarely used my 4 wheel drive and most of my 82,000 miles was used for highway towing. That probably equated to less abuse of the transfer case and its fluid.

Instead of using Dexron III or Transynd, I'll be replacing the fluid with three quarts of Amsoil 5W-30.

Here is the article why it might be a good idea to use 5W-30 synthetic motor oil for our transfer case fluid. The article was written by Mike Weinberg, President of Rockland Standard Gear
Article

The article is found as a PDF file....... Click Doc. # - 0307 New Venture 261 and 263 (1090k)

[05duramonster]

thats a pretty good read. i am going to look into that further for sure.

[Diesel Nut]

ATF is a hydraulic fluid, and the stock conventional stuff is subject to evaporation. This is called the Volatility Rate on tests. Basically, the lighter portions of the oil boil off. Same is true of motor oils. Even though you rarely use 4wd, you still rotate the t case and still build heat in it. This is a perfect example of why you must do your regular maintenance and use the best lubes available!

[fr8dog]

Amsoil, I use the Series 3000 5W-30 Heavey duty Diesel in my motor, is that the same Amsoil I should use the transfer case OR the Amsoil 100% synthetic 5W-30?

[KSL667]

why not run an 80-90, 80-140, 85-140, or something like that like the old trans cases? i mean it is a chain case and on our tower machines we use 85-140 in the chain cases cause nothing else sticks to the chains at high speeds

[daddysLBZ]

Amsoil makes some severe gear lube for this....but Kyle is correct.I see nothing wrong with using the older thick stuff aroud 90-120 or so weight should last longer,and like he said,stick well to the parts/chains/and such that move and build heat.Like mentioned above the fluids just kinda thin and evaporate after time.Since you did heavy highway towing for 80k,can you imagine the heat and turns the t-case made??YES,heat and friction are killers of moving parts...for cheap insurance,I top mine off reg with 90 weight gear oil...I use the Castrol.Never any problems,and I use 4hi all the time when it rains,around here that's plenty in the winter.

Like the man said above,the reg checking and maint is vital to t-case life..I never had one go out using 90 wt,and hope I never do,so every 25k,my butt is under there,draining and replacing that crucial stuff!!!

[Dirtbikindad393]

102,383 miles on the stock front diff and T-case oils. I just replaced the front & rear diff and T-case last night. I swear my truck rolls smoother and better.

I used the HDD 5W-30 Amsoil Diesel oil. I only out in two qts becuse I didn't have a wrench to take off the speed sensor and didn't want to take a chance on stripping it using an ajustable socket set wrench. I will never let it go that far again anyway.

I also added on the Mag-Hytec diff cover to the rear as I do a lot of towing. The added 3 qts of oil should help keep things cool and clean in there.

It was easy and now I have a little more piece of mind knowing that those fluids are new. Next up the trans and adding the Mag deep trans pan.

When it comes to these fluids in particular you need to use the best and Amsoil' severe gear is the best. I have a dealer that will sell it to you all day long at his cost so if you need a hook up shout.

[RedBowTies88]

bringing this back up with a new question...though probably a dumb one i plan on using ATF for the case and not motor or gear oil. any reason why i should dex III or dex VI over one another? i dunno if the VI is thinner or anything....

[Hondarider552]

Why arent you going to use motor oil Beech?

if your not going to use motor oil, put 2 qts in, tighten fill plug then add another 1 qt from the speed sensor.

[RedBowTies88]

Originally Posted by Hondarider552

Why arent you going to use motor oil Beech?

if your not going to use motor oil, put 2 qts in, tighten fill plug then add another 1 qt from the speed sensor.

i dunno man doing shit out of spec scares me sometimes i have to imagine there's a reason the factory said ATF..

so i should fill it over the actual fill plug? is the speed sensor easy to find?

maybe ill do motor oil i dunno