My AX15s are still shifting great after thousands of miles, and don't rattle at all. Modern GL5 gear oil will eat the synchronizer rings over time, GL4 or manual transmission rated gear oil is fine to use but harder to find, which is why Chrysler stared using 30 weight motor oil instead. Be careful when taking advice from people who can't spell, capitalize. or punctuate correctly, and call a group of people who have far more experience with the AX15 "baffoons".

 

lol you havent a inkling what your talking about so i wont bother responding except to say that
regurgitating internet urban legend nonsense is a bad habit to get into

 

 

Thanks for your for your help.......

 

https://www.novak-adapt.com/knowledg...ns/manual/ax15

"Transmission Fluid

The factory manuals call for 75W90 GL-3 gear oil for the AX15 transmission. This fluid is essentially obsolete; superseded by GL4, then GL5. However, many GL5 fluids have friction modifiers that are not compatible with synchronizers, so make sure to check for compatibility.

It is the experience of some that a 50W fluid provides quicker shifts and especially so in colder climates."

 

please i urge you to stop posting until you know what your talking about.
the factory dodge manual says clear as day gl5. not 3 or 4.
the friction modifiers in the novak literature is refering to some gl5 oils with predosed limited slip friction modifier additives. many gl5 are not predosed and this is the oil thats recomended for the ax15.
millions of toyota manual transmissions of the last 30yrs also call for gl5 . use the nondosed stuff and synchros will out last the car itself

 

GL5 oil made 25 years ago didn't have those additives, most of it that they make now does, which is why they changed the spec to 30 weight motor oil in a TSB, or you can use GL4, and manual transmission fluid.

 

i dont keep up on tsb's but if there was one ,its simply because dodge knows full well that vehicle owners arent smart enough to know what fluid theyre dumping in. saving people from their own foolish mistakes is what they were doing.

yes, most, perhaps all gl5 oils didnt have the predosed LSD additives 25yr ago. thats why the dodge manual simply says gl5 with no precautions. today many of the gl5 are predosed but many are not. it clearly says right on the bottle if its dosed or not. the undosed is what the manual calls for and works well. use motor oil , aunt jamima syrup or peanut butter for all i care.
back to how this argument even started. chemicals in gl5 do not eat ,in any way , manual tranny synchros. its a old myth from decades ago. the synchro destruction people talk about has to do with the LSD stuff in some gl5 , as i suspect it prevents the synchros from operating as designed

 

start this video at 4:40. it shows exactly why the dosed gl5 causes problems. the syncho ring needs a certain amount of friction to operate correctly. the LSD additives in dosed gl5 ,mainly designed for clutch pack differentials , alter the friction of the synchro and the gears grind then eventually it damages the transmission.
alot of people are confused about gl5 and manual trannys. gl5 doesnt chemically eat the synchro. its the LSD additive in the dosed versions that alter the friction needed for the synchro to work properly.

 

You can use what you want but I will stick with what works, like I said I have put thousands of miles on mine with 15w40 diesel motor oil in them with no issues at all, 30 weight oil is fine to use as well. The only gear oil I would use in an AX15 is oil that is rated for manual transmissions like Redline MT90, I have seen too many manual transmissions damaged and/or not shift properly from using the wrong type of gear oil in them.