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Old 12-31-2010, 08:38 AM   #31
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x2 with devdawg..go with .gl4....the soft synchros in the gearbox dont like gl5!!..royal purple syncromax in transfer..and 75w90 max gear in gearbox..its gl-4 and gl-5 compatable!!..then u cant go wrong!!..lol

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Old 12-31-2010, 10:06 AM   #32
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Ive tried a few different kinds of tranny fluids, the best two ive found is Redline MT-90 or Penzoil syncromesh.

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Old 01-01-2011, 01:14 PM   #33
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Ok I read this whole post and I have a 1998 yj automatic what is the fluid to use in it. Cause I need to change it cause I got water in the tranny.
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Old 01-01-2011, 06:45 PM   #34
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If you have a '98 YJ, then you have a Jeep from the Twilight Zone my friend. In this dimension they stopped making the YJ in '95.
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Old 01-20-2011, 10:02 AM   #35
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So is there an agreement here on Penzoil Syncomesh? Or Synthetic 75w90? Or... Idk..i have an Ax-5 thats on the way and i want the best for it.. And wanna change the transfer case fluid too.. Whats the best for that?
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Old 01-21-2011, 05:41 PM   #36
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gl4 gl4 gl4 gl4 gl4 gl4 gl4 gl4 gl4
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Old 01-26-2011, 07:49 PM   #37
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I went with Syncromesh after adding up all the choices people have made here on WF. Ill update after a while. It already feels ta be smoother. Also as the 80w90 GL5 came out it was sparkling a tiny bit.. Fudge that stuff.. Lol
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Old 01-27-2011, 01:19 PM   #38
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Quote:
Originally Posted by benaldridgejr View Post
I went with Syncromesh after adding up all the choices people have made here on WF. Ill update after a while. It already feels ta be smoother. Also as the 80w90 GL5 came out it was sparkling a tiny bit.. Fudge that stuff.. Lol
synchro or mt90 is the magic juice, just make sure you get ALL of the old fluid out before you switch anything
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Old 01-27-2011, 01:20 PM   #39
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Quote:
Originally Posted by Wizzardj View Post
Ok I read this whole post and I have a 1998 yj automatic what is the fluid to use in it. Cause I need to change it cause I got water in the tranny.
Automatics use ATF (automatic transmission fluid) not any of the 75w90 gear oil
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Old 01-27-2011, 05:12 PM   #40
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Quote:
Originally Posted by wasomma

synchro or mt90 is the magic juice, just make sure you get ALL of the old fluid out before you switch anything
Pretty much all of it came out,i put in 3 qrts of syncro and its not full so i suppose most came out. i may run it a bit and redo it again. Its only about 28 bucks. Thanks for the input. I read that sycro (as well as the royal purple stuff) and gl5 are compatible and others had done a 2:1 ratio of them due to the thickness also.. I prefer one fluid at a time but idk.
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Old 01-27-2011, 05:15 PM   #41
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Quote:
Originally Posted by Wizzardj
Ok I read this whole post and I have a 1998 yj automatic what is the fluid to use in it. Cause I need to change it cause I got water in the tranny.
Does it not say on the stick what ta use???

Use maxlife dexron, its the good stuff, we put it in EVERY vehical we flush at the shop, including a couple Jeeps, its even used for certain Nissans and Fords requiring SLF..(dealer fluids lol)
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Old 01-28-2011, 10:43 AM   #42
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Quote:
Originally Posted by benaldridgejr View Post
Pretty much all of it came out,i put in 3 qrts of syncro and its not full so i suppose most came out. i may run it a bit and redo it again. Its only about 28 bucks. Thanks for the input. I read that sycro (as well as the royal purple stuff) and gl5 are compatible and others had done a 2:1 ratio of them due to the thickness also.. I prefer one fluid at a time but idk.
Its the phosphates in GL5 that reacts with some of the metal components of the ax-15's gears/synchros because of its age and the type of metals used in its components

Quote:
GL-4; Specified for hypoid gear service under severe service but without shock loading. This classification is essentially obsolete but is still specified by some manual transmission/transaxle manufacturers. Implies an EP/AW additive package that contains 30% to 50% less S-P additives than the GL-5 service classification. Some Marine Gear Lubes fall into this classification, especially the full Synthetic Marine Gear lubes and specialty blenders MT lubes that use high levels of esters.

GL-5; Specified for hypoid gear service but with shock loads and severe service operation. Usually meets Mil-L-2105D and in most cases, is the multipurpose automotive gear oil. Most 75W90 to 75W140 grades meet the GL-5 classification. This grade has a high level of Extreme-Pressure additives that could be mildly corrosive to nonferrous parts, such as brass, bronze and aluminum parts. Most of the modern GL-5 lubes contain metal deactivators that prevents attacks by the extreme-pressure additives. In addition to EP additives, these lubes contain rust inhibitors, defoamants, friction modifiers, thickeners, and Viscosity Index Improvers.
http://theoildrop.server101.com/ubb/...;f=21;t=000029
If you're interested read this:

Gear Tribology and Lubrication - Part I - Bob Is The Oil Guy

EP Additives - Lubricant Rheology and Tribology - Bob Is The Oil Guy

This guy is good too---->

Quote:
What's different in the chemistry?
This is answer changes by the blender. Each blender has different additives to make their oil pass certain ASTM tests reviewed by the API. These tests might involve corrosion resistance, gear distress, scoring, oxidative stability, deposit formation, etc.

I can tell you a secret. If your GL-5 also meets the API MT-1 spec, then you're really on to something. I'm not saying you'll be able downshift to first at 18MPH, or that your gears will never grind, or any of the "smooth" talk that I see so much. But your gearbox metals will be more fully protected.

One more thing. Some talk is going around about GL-5's not protecting the yellow metals. Any responsible blender is going to use additives to inhibit corrosion, but the GL-5 spec DOES NOT require the blender to test the ASTM D 130 which directly relates to copper alloys. The answer is using a GL-5 that passes the MT-1 spec too.
GL-4 vs. GL-5 - NASIOC
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Old 01-29-2011, 12:32 PM   #43
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Really cool info.
And to update, the Syncromesh is AWESOME! I highly recommend it!

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