Front/Rear axle and transfercase synthetic oil preferences?

David@TNT · **Joined:** Thu May 18, 2006 12:50 pm **Posts:** 41

First off just to make sure is it 75/90 that going in the axle housings and on the transfer case do you have to use the atf+4?

Guest · **Posted:** Mon Jun 19, 2006 1:31 pm

David@TNT wrote:

First off just to make sure is it 75/90 that going in the axle housings and on the transfer case do you have to use the atf+4?

That is my understanding. Techinically, it's 80W-90 for the front and rear, but I have not seen synthetic available in that weight. I use the 75W-140 synthetic in the rear due to trailer towing and the torque of the CRD - recommended by the user manual. I put 80W-90 Valvoline DuraBlend in the Front Diff until I decide what I want to run full time. The front is such an easy job that you can change whenever.

Guyute1210 · **Posted:** Mon Jun 19, 2006 2:40 pm

I used Amsoil, Contact JJ about it...

Jeepjeepster · **Posted:** Mon Jun 19, 2006 7:05 pm

I used castrol 75w-140 syn in the front and rear axles. Never changed the transfer case but Ill use ATF+4.

JJsTJ · **Posted:** Mon Jun 19, 2006 10:21 pm

Guyute1210 wrote:

I used Amsoil, Contact JJ about it...

What he said!! :wink:

Heck w/ ATF+4, use something that is better! Amsoil UNiversal Synthetic ATF will work better and longer than ATF+4 while meeting or beating the specs of it. Shoot me a PM for more info.

Jeepjeepster · **Posted:** Mon Jun 19, 2006 11:14 pm

JJsKJ wrote:

Guyute1210 wrote:

I used Amsoil, Contact JJ about it...

What he said!! :wink:

Heck w/ ATF+4, use something that is better! Amsoil UNiversal Synthetic ATF will work better and longer than ATF+4 while meeting or beating the specs of it. Shoot me a PM for more info.

Can you mix this with the old stuff? Or do you need to get all of the old stuff out?

JJsTJ · **Posted:** Thu Jun 29, 2006 7:17 am

Jeepjeepster wrote:

JJsKJ wrote:

Guyute1210 wrote:

I used Amsoil, Contact JJ about it...

What he said!! :wink:

Heck w/ ATF+4, use something that is better! Amsoil UNiversal Synthetic ATF will work better and longer than ATF+4 while meeting or beating the specs of it. Shoot me a PM for more info.

Can you mix this with the old stuff? Or do you need to get all of the old stuff out?

It will mix fine. On a normal drain, enough will come out that it won't be an issue.

Jeepjeepster · **Posted:** Thu Jun 29, 2006 5:45 pm

JJsKJ wrote:

Jeepjeepster wrote:

JJsKJ wrote:

Guyute1210 wrote:

I used Amsoil, Contact JJ about it...

What he said!! :wink:

Heck w/ ATF+4, use something that is better! Amsoil UNiversal Synthetic ATF will work better and longer than ATF+4 while meeting or beating the specs of it. Shoot me a PM for more info.

Can you mix this with the old stuff? Or do you need to get all of the old stuff out?

It will mix fine. On a normal drain, enough will come out that it won't be an issue.

So if you dropped the pan all would be ok. I thought it only got a gallon with that and there was something like 10quarts in the tranny?

JJsTJ · **Posted:** Thu Jun 29, 2006 7:14 pm

I thought the topic was the transfer case? Anyhow, Regardless of what we are talking about, the Amsoil ATF Will mix fine in the transmission But it will not really be much better than what was in there because of the dilution. The proper procedure for swaping All the fluid out of the transmission and converter involves disco-ing the cooler lines and running the engine while the lines exchange new fluid for old. One line in a bucket of clean, new fluid and the other pumping old fluid into another empty bucket. It is a harrowing experience with the possibilty for a big mess (did it once on my old Buick). To tell you the truth, I have not yet done it on my KJ. I will soon be doing it though, prior to my SFA work. I am also looking into putting an external tranny filter into the system. More info on that in near future too.

AdamIsAdam · **Posted:** Sun Jul 09, 2006 9:15 pm

I run Royal Purple 75W-140 in the diffs (it's API5 rated for the front). It eliminates the need for an additive if you have trac-lock. I like it. And it's cool cause it's purple.

I just put Amsoil ATF into the transfer case.

I run Mopar ATF+4 in the tranny.

jpzkj · **Posted:** Mon Jul 10, 2006 1:20 am

The book calls for ATF 4 in the transfercase, but the others mentioned will all work.

jeepkj02 · **Posted:** Mon Jul 10, 2006 10:53 am

I used 80w90 in the front and rear without any problems. Found it cheaper than 75w90 and 75w140.

AdamIsAdam · **Posted:** Mon Jul 10, 2006 11:15 am

jeepkj02 wrote:

I used 80w90 in the front and rear without any problems. Found it cheaper than 75w90 and 75w140.

Why would you not run the recommended weight to save $1 or two per quart? The manual is very clear on which weights to use when (towing, trac-lock, HD loads, etc).

I don't mean to sound short, I'm really just wondering why not use what they call for in terms of weight. It's not like motor oil even, where they give you ranges for different conditions. 80W90 is not listed in the manual at all, right? Maybe I'm wrong, but I don't think so.

jeepkj02 · **Posted:** Mon Jul 10, 2006 1:48 pm

AdamIsAdam wrote:

jeepkj02 wrote:

I used 80w90 in the front and rear without any problems. Found it cheaper than 75w90 and 75w140.

Why would you not run the recommended weight to save $1 or two per quart? The manual is very clear on which weights to use when (towing, trac-lock, HD loads, etc).

I don't mean to sound short, I'm really just wondering why not use what they call for in terms of weight. It's not like motor oil even, where they give you ranges for different conditions. 80W90 is not listed in the manual at all, right? Maybe I'm wrong, but I don't think so.

I don't never tow anything, or carry heavy loads, and I don't have a track-loc. 80w90 is not much different from 75w90/75w140. I have had it in my frt/rear axles for a few months. No noise, nothing...no problems. Plus its not just a few dollars, more like $10 bucks/qt. I'm just a poor college student, so 30-40 bucks is a lot!!! LOL!!

AdamIsAdam · **Posted:** Mon Jul 10, 2006 1:58 pm

jeepkj02 wrote:

...Plus its not just a few dollars, more like $10 bucks/qt. I'm just a poor college student, so 30-40 bucks is a lot!!! LOL!!

Royal Purple is $10/qt for the 75W90, and $12 for the 75W140. I see the problem - stay away from the dealer's parts if possible!

See, now I just saved you beer money for half your next semester!

JJsTJ · **Posted:** Mon Jul 10, 2006 2:08 pm

AdamIsAdam wrote:

jeepkj02 wrote:

...Plus its not just a few dollars, more like $10 bucks/qt. I'm just a poor college student, so 30-40 bucks is a lot!!! LOL!!

Royal Purple is $10/qt for the 75W90, and $12 for the 75W140. I see the problem - stay away from the dealer's parts if possible!

See, now I just saved you beer money for half your next semester!

And Amsoil gear lubes are better and priced similarly. :wink:

I do however agree that you should be Ok w/ 80w-90 for regular use. Perhaps changing it more often though. (which won't save you money)
Running Amsoil Severe Gear for up to 100,000 miles (regular use or 50,000 miles for severe use) would probably save you a couple cases of beer though. :wink:

AdamIsAdam · **Posted:** Mon Jul 10, 2006 2:23 pm

JJsKJ wrote:

And Amsoil gear lubes are better and priced similarly. :wink:

I do however agree that you should be Ok w/ 80w-90 for regular use. Perhaps changing it more often though. (which won't save you money)
Running Amsoil Severe Gear for up to 100,000 miles (regular use or 50,000 miles for severe use) would probably save you a couple cases of beer though. :wink:

How much is the Amsoil 75W-140? NEVER MIND. JUST FOLLOWED YOUR LINK!

I don't like to run them that long simply because of the water crossings. Even with my breathers extended, if I'm in a lot of water, I figure I need to change the fluid regularly.

JJsTJ · **Posted:** Mon Jul 10, 2006 2:55 pm

AdamIsAdam wrote:

JJsKJ wrote:

And Amsoil gear lubes are better and priced similarly. :wink:

I do however agree that you should be Ok w/ 80w-90 for regular use. Perhaps changing it more often though. (which won't save you money)
Running Amsoil Severe Gear for up to 100,000 miles (regular use or 50,000 miles for severe use) would probably save you a couple cases of beer though. :wink:

How much is the Amsoil 75W-140? NEVER MIND. JUST FOLLOWED YOUR LINK!

I don't like to run them that long simply because of the water crossings. Even with my breathers extended, if I'm in a lot of water, I figure I need to change the fluid regularly.

I agree on water crossings and checking or changing regularly if you play in the water regardless of brand. Note, those prices are retail and Lost folks don't pay that if they go through me. :wink:

Front/Rear axle and transfercase synthetic oil preferences?

Who is online