Allison 5sp: Transfer case fluid

[02greysixer]

Alright I have searched and searched but can't find the thread I'm thinking about. At least I think there was a thread regarding transfer case fluid. Seems like I remember ppl using synthetic motor oil in them? Or maybe I'm thinking of one I read about regarding the zf6 tranny.

Regardless, is a light synthetic motor oil better for the transfer case than ATF? Or should I just stick with good ATF?


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[bluecollar]

Atf here!

 

[duramax hd]

Just a good Dex 3 ATF is what I was told to use and is in mine

 

[Chevy1925]

5w-30 full syn was suggested by Mike L for those who do not often check their t-case fluid level and have issues with evaporation in the case.

 

[baggedLB7]

http://www.duramaxdiesels.com/forum/showthread.php?t=16312

 

[02greysixer]

5w-30 full syn was suggested by Mike L for those who do not often check their t-case fluid level and have issues with evaporation in the case. ATF is the best lubricant for the t-case but because i dont check the case as much as i should, i run 5w-30 full syn.

This must have been what I saw at some point. Any negative effects from using it? I'm one of those bums that neglects to check fluids as often as I should to


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[02greysixer]

And there is the thread. Thanks slammed. I knew it was somewhere. I just couldn't make the good old tappytalk find it :thumb:


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[Chevy1925]

This must have been what I saw at some point. Any negative effects from using it? I'm one of those bums that neglects to check fluids as often as I should to


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I edited my post as what I originally said is incorrect

 

[02greysixer]

5-30 synthetic valvoline is what mines getting


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[sickdiesel]

i run 5-30 in both of mine as well.

 

[blk smoke lb7]

Auto track 2 here

 

[snowman]

Seeing how most of you guys are from down south where it's warm. Does anyone in the northern areas run engine oil in there t-case? U found some 0W-20 full synthetic and was wondering if that'll work. I'm worried about shifting issues when it's cold.

 

[THEFERMANATOR]

I'm running AMSOIL syncromesh fluid in mine. It is very simliar to ATF, but formulated for a manual trans. It has a 5W30 rating on it, but has a slightly different viscosity when you look at the MSDS sheets. It has a slighly lower viscosity when cold, but slightly thicker when hot. it is very simliar to the fluid that goes into the NV3500 trans. Only downfall i have found is it is some slick stuff and always seems to find a way to seep a little around the seals.

 

[WVRigrat05]

Ive been running syn. 75w-140 and 75w-90 in mine since 80k I have 221k on the transfer now. I recently changed it with just shy of 100k on the oil and it looked great. slight darkness and no metal shavings.

 

[coldLBZ]

Seeing how most of you guys are from down south where it's warm. Does anyone in the northern areas run engine oil in there t-case? U found some 0W-20 full synthetic and was wondering if that'll work. I'm worried about shifting issues when it's cold.

I run 3 qts. syn. 5w30 in mine. I have used 4x4 in temps as low as -50. So far so good.

 

[THEFERMANATOR]

Ive been running syn. 75w-140 and 75w-90 in mine since 80k I have 221k on the transfer now. I recently changed it with just shy of 100k on the oil and it looked great. slight darkness and no metal shavings.

I feel bad for the pump in your case trying to move that syrup on a cold morning.

 

[Bonestock]

5w30

I have been running 3 quarts of 5w30 in the lb7 tcase for 20k so far. I think the bushing and yoke would have been completely trashed if I was still running ATF. It is time for me to replace bushing on tail shaft housing & yoke but hell the 5-30 synthetic is working!:thumb:

 

[WVRigrat05]

I feel bad for the pump in your case trying to move that syrup on a cold morning.

I don't, It was slinging oil everywhere at 70k, I replaced the driveshaft, yoke and seal at 100k, at 130k I thought I felt bad and put 5w-30 in it for like a week and it leaked after 2+ hr drives to and from work. So I put 75w back in it. If it flies apart I'll buy a new one.

 

[workin' diesel]

I run 3 quarts of Full syn 5W 30 too. I plow snow so I put it through some good work

 

[02greysixer]

Well mine is getting changed in the morning. I am really really hoping I drain out at least close to 2 quarts of nice clean tranny fluid from it and not a few drops of burned up black tar like I did out of my buddy's 05 lly. And I'm really really really really hoping mine doesn't puke it all back out through a pump rub hole in the top like his did after we fille it back up


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