Outer Limits 4x4 Board

Anyone had any luck trying to get better [quicker and smoother] changes from their box with a different oil or oil additive that has no harmful affects?

i personally think that the stock 4 speed box, when in good knick is a really nice gearbox anyway... granted it's not sporty, but it feels solid, with nice shifts...

i added some gearlube tm or something to the 40's box that is a bit stuffed, and it made no difference

i use penrite gearbox oil and i get smooth gear shifts but i also have just had it rebuilt. but before the rebuild it was hard to shift when cold but ok when hot and thats when i change to penrite and it had an istant effect with easy shifts hot or cold just noisey bearings but did quiting it down. and you wont get quicker shifts with out modding the shift linkage

I picked up a tube of that Nulon stuff from KMart ($9 I think)

I wasnt expecting anything, but it really did make the shifts smoother

I will use it again next oil change. Probably put a tube in the GQ aswell

Castrol VMX M is supposed to be a good oil to smooth out the shifts.
Andrew

I second the Castrol VMX 80.
I was getting ready for a g/box rebuild because the synchros felt so bad.
Since I changed the oil, no more problems .Can probably go another year or three now

you could try redline oil i've had some sucess
with it in the past. www.redlineoil.com.au

Try a heavier grade oil then what u normaly use.

I put that Nulon stuff in the gearbox & diffs of the Cruiser, it doesn't say it on the tube but the PFT or whatever it states is in it is in fact Teflon, they must have to use its chemical name cause DuPont probably owns the trademark. I've heard & read a lot about teflon over the years & it does really seem to stop a lot of the wear on metal surfaces. An engineer told me some time ago that some sugar mill he worked at put teflon in the gear boxes that drove the cane crushers & the amount of wear reduction on the gears was huge. Whether this Nulon treatment has enough teflon in it to make a difference I don't know, but its cheap enough to take a punt on.