Thread: LT95 gearbox oil .... again.

http://www.aulro.com/afvb/101-forwar...ml#post2002581

There are many threads about this all over the place.
Personally, I've been stung before with using gear oil so I'm a stickler for using engine oil. I've learnt my lesson.
Having said that, I've always wondered, with the tapered bearing kit (which you should have), is it possible to use a thicker oil such as gear oil in them? Is it advisable or not?

Haven't used the Peak oil that you have, but have been running Castrol Syntrax (75W90) or Penrite Pro-Gear(75W85) which are both full synthetics in the main box for nearly 50K km's total now with no issues. I'd be happy to run that Peak 75W85 in mine.

From what I've read and been told by others, a major contributor to the oil migration issue is the spacer on the gearbox output shaft rotating on the shaft.
Its a simple/quick job to pull the back cover on the transfer and remove the output gear and spacer.
a very small dab of weld inside the spacer will locate it in the output shaft spline and stop it turning, and refitting it with a smear of sealant (I used Loctite 515) will stop the oil migrating down the inside.

Mine doesn't suffer oil migration (I also replaced the output seal and put sealant on the reverse gear shaft when rebuilding it but those jobs aren't aren't quick/easy).

Steve

There are so many opinions regarding this but this is my experience. I found that using a 20/50 engine oil to be the most successful I found VMX to be too light. I respect Rick130 and his opinions and I am pretty sure he is an advocate for a dedicated gear oil.

People seem to want and make this harder than it needs to be - engine oil 20w50 - KISS

Garry

Engine oil for the gearbox & t/c is fine - and a simple solution.

However, & FWIW, we have been using Castrol Syntrans 75/85 in the gearboxes (R380, LT85 and LT95), and in the lT95 t/c (very smooth changing and extended change life).

Castrol Australia - Drive Line Fluids (part 2)

Originally Posted by garrycol

People seem to want and make this harder than it needs to be - engine oil 20w50 - KISS

Garry

I'm sorry if I gave the impression that I'd rather run as many different oils as I can. The purpose of my post is to ascertain whether I can use the same oil in the x-fer as in the main box, as atm, I don't need yet another project ... no time to fix the migration issue at the mo.

As I already know that the Peak won't eat bronze, I'll re-phrase the question. What I really need to know is .... will the Peak 75w-85 thicken at increased temps, enough to damage the oil pump? I guess I may need to contact Peak.

Thanks and Cheers,
cw.

No it won't. The issue with thick oil and pump breakage is EP90 oil at very cold temperatures.
Think there is one of Rick130's posts somewhere giving the relationship between engine oil and transmission oil ratings. IIRC that 75W85 oil you have would be very similar to 20w50 engine oil.

Steve

Thanks Steve,
That's the info I needed. Guess I should learn how to ask questions.
I'll give it a run and get back here with the results.


Cheers,
cw.

ps. I had looked for Rick130's post on viscosity relationship, but got bogged down in the massive size of the topic.