Transmission fluid

[Ragtopman]

I just rebuilt my AX15 and am having trouble with this fliud thing. Pennsoil syncrmesh states its GL-5 but everyone says not to use gl-5. Which Pennsoil should I get and Can I use Mobil 1 sinthetic 75w-90

 

[currupt4130]

GL3 or GL4. I had to call an industrial fleet supply place to find it once before...

 

[TwistedCU]

Pennziol Synchromesh isn't GL5 that everyone says to stay away from. It does not have the corrosive properties that are found in GL5. I believe it just has that on there because it meets the standard fo vehicles that call for GL5. It can be used in the AX5 and AX15 transmissions, many do. I have seen people post on this site that it smoothed out trannies that were acting up and shifting rough.

The Jeep and their dealerships recommend GL3. Good luck finding it anywhere but the dealer and the dealer overcharges for it.

From everything I have heard, read, and seen Redline MT90 is your best choice. It is fully synthetic.

 

[90Xjay]

I just rebuilt my AX15 and am having trouble with this fliud thing. Pennsoil syncrmesh states its GL-5 but everyone says not to use gl-5. Which Pennsoil should I get and Can I use Mobil 1 sinthetic 75w-90

The Mobil product you mentioned is a GL-5.

I'm not familiar with the reason behind keeping a GL-3 spec product in there, unless there may be some softer metals in there and some of the EP additives used, mainly sulphur, will cause pitting in softer yellow metals. AGMA, American Gear Manufacturers Association, sets the specs for grear oils. Most other transmissions and final drives that called for a GL-? when ever they were designed can now take the GL-5.

I'd like to find out some more about this..

 

[TwistedCU]

some of the EP additives used, mainly sulphur, will cause pitting in softer yellow metals

That's it. The sulphur corrodes the brass synchronizers. This is obvious by the shiny brass particles that will be seen in the oil when it is changed after GL5 is used in these transmissions.

The real kicker is that all the factory JEEP owner's manuals and all the aftermarket service guides like Chilton's and Hayne's say to use GL5... which will destroy the transmission

I believe fully synthetic oils like the MT90 I suggested or even the Mobil 1 mentioned above do not contain that sulpher... isn't that correct?

 

[TwistedCU]

Oh, and I can verify this to be true. Following the owner's manual cost me an AX5 in my 92 YJ (my first and long gone Jeep).

They are expensive to rebuild

 

[90Xjay]

That's it. The sulphur corrodes the brass synchronizers. This is obvious by the shiny brass particles that will be seen in the oil when it is changed after GL5 is used in these transmissions.

The real kicker is that all the factory JEEP owner's manuals and all the aftermarket service guides like Chilton's and Hayne's say to use GL5... which will destroy the transmission

I believe fully synthetic oils like the MT90 I suggested or even the Mobil 1 mentioned above do not contain that sulpher... isn't that correct?

"Mobil 1 Synthetic Gear Lubricant LS 75W-90 combines wax-free synthesized hydrocarbon base oils and a specially designed extreme-pressure, limited-slip, sulfur-phosphorous additive system to provide a significantly higher level of performance in rear axles and differentials versus conventional fluids. "

From the product data sheet on the product.

sorry, it uses sulphur for the EP package.

here is the link to the Product data sheet
http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil1_Synthetic_Gear_Lubricant_LS_75W-90.asp

 

[Thord]

What should I use in my T176???

 

[TwistedCU]

"Mobil 1 Synthetic Gear Lubricant LS 75W-90 combines wax-free synthesized hydrocarbon base oils and a specially designed extreme-pressure, limited-slip, sulfur-phosphorous additive system to provide a significantly higher level of performance in rear axles and differentials versus conventional fluids. "

From the product data sheet on the product.

sorry, it uses sulphur for the EP package.

here is the link to the Product data sheet
http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil1_Synthetic_Gear_Lubricant_LS_75W-90.asp

I guess I could've looked that up, eh?

As for MT90... good to go:
MT-90

Popular in Nissan, Toyota and Mazda manual transmissions and transaxles as well as other selected applications, this is a 75W90 GL-4 Gear Oil that’s slightly heavier than MTL. Provides excellent protection of gears and synchronizers and its balanced slipperiness provides a perfect coefficient of friction, allowing easier shifting.

slipperiness? is that a word? lol

 

[TwistedCU]

Pennzoil info... this shows why many folks use it in the Ax series trannies

Pennzoil® Synchromesh Fluid is a synchromesh transmission fluid designed for certain manual transaxles and manual transmissions used by General Motors or Chrysler. Pennzoil® Synchromesh Fluid is formulated with high quality paraffinic base stocks, a fluidity modifier, multifunctional performance additives, corrosion inhibitors, a foam suppressor and a shear stable viscosity index improver additive. It provides excellent oxidation stability, low temperature performance, excellent synchronizer performance and compatibility with yellow metals, such as bronze, brass and copper components found in manual transaxles and transmissions. This product will satisfactorily lubricate General Motors or Chrysler manual transaxles and transmissions from -40°C to +150°C.

 

[Bounty__Hunter]

Mobil 1 syn. will eat the soft brass synchros of the AX trannies. I use Redline MT90 in my high-mileage AX5 and love it, smooth shifting even in the dead of winter. Well worth the cost.

 

[Ragtopman]

thanks all I picked up the Pennzoil off the shelf at NAPA for about $6 a bottel

 

[90growler]

The real kicker is that all the factory JEEP owner's manuals and all the aftermarket service guides like Chilton's and Hayne's say to use GL5... which will destroy the transmission

Crap! I just changed mine with Synthetic 75-90 that says GL-4, 5, or 3. Do I need to drain it.:?

 

[TwistedCU]

Crap! I just changed mine with Synthetic 75-90 that says GL-4, 5, or 3. Do I need to drain it.:?

I would find out if it has the sulphur in it. If it does then yes by all means change it. I would flush it out well, or change it twice.

 

[Bounty__Hunter]

Crap! I just changed mine with Synthetic 75-90 that says GL-4, 5, or 3. Do I need to drain it.:?

I'd bet, yes. Which brand?

I've filled the transmission with ATF then drained it before, somewhat of a cheap flush to make sure all the bad gear oil is out.

 

[90growler]

I'd bet, yes. Which brand?

I've filled the transmission with ATF then drained it before, somewhat of a cheap flush to make sure all the bad gear oil is out.

I put generic in it with Lucas oil stabilizer

 

[90Xjay]

I put generic in it with Lucas oil stabilizer

what like Walmart brand?
It must have a name on the bottle.