redwolf3

Hey Guys-
So, I recently had my Transmission and Transfer Case rebuilt by a local shop. The owner seemed to be a good guy, and the shop had lots of quality recommendations from reviews, etc (including friends who had previously used them).

To my question: When he gave me back the Transmission and Transfer Case, he recommended that instead of the Toyota Recommended Fluid of 75w90 gear oil in the tranny, he recommended 20w50 engine oil. I found this to be a little odd. His explanation made sense: The thicker fluid can sometimes cause the transmission to shift stiffly when cold, but I'm wondering what you guys think?

Either way, I will be doing Synthetic all around. Sadly, my favorite brand (Royal Purple) doesn't easily come in 75w90, so I may be going to Amsoil, but thems the breaks sometimes.

Volcom

RedLine MT90

Juebles

I would go with the 75w90 seeing as you are in california im geussing you don't get alot of subzero temps. and amsoil is good stuff I would go with that.

TORTIS

iTrader: (1)

Don't run GL5 in your trans. NAPA has a GL4 for a good price. I can't get Redline here in town.

Never heard of running 20w50 in a trans.

86tuning

That's all we ever use in transmissions, for everything from racecars to dailys to trucks. I highly recommend it.

Honda specifies engine oil in their transmissions. Engine oil can work, but I wouldn't use synthetic engine oil unless it's motorcycle oil. I feel that most synthetic engine oils are too slippery for synchros.

If your transmission shop recommends it, you can go ahead and run it, because if it fails, they will warranty it

pruney81

I would use Redline MT90 synthetic. I have never heard of running 20W50 motor oil in our transmission's ever.

Mr.Utah

Reviving this thread. So whats YOUR recommendation for gear oil. please include cold weather preferences as well????

MudHippy

You can use what Toyota recommends for the W56. API GL-4 or GL-5 SAE 75W-90 or 80W-90 GEAR OIL! JUST DO NOT USE MOTOR OIL! That's ridiculous. It's nowhere near thick enough, nor does it have the proper EP additives needed to protect the transmission's internal components from excessive wear. VERY DUMB!!!!

On that note, thanks for giving me something else to put in the "dumbest thing someone's told you about cars" thread.

BS!

Mr.Utah

Thanks

vital22re

iTrader: (2)

you might dig a little deeper mudhippy. I remember doing a drain and fill for a manual honda civic or some sort of honda and I believe it called for 10w40. But now im sure they superceded it what you have pictured.

http://media.honda.co.uk/car/owner/m...l/pdf/13-3.pdf

kiyobrown

andrewflores17

my old thumper yahmaha used 10-40 for the trani and engine but that was that and that was recomended for that

remember these enginers that made these numbers up and recomended them were not just going to work that day to see what the wife packed in the lunch box

Volcom

I'll quote myself - RedLine MT90

MudHippy

I might. Then again, I might not. It's a matter of relevance really. But for all I know, Honda manual transmission fluid IS ??W-?? motor oil. And in all honesty, I left the part out where they stated that their recommendation of "Honda manual transmission fluid ONLY" was for all 98 and later Hondas. Before which they obviously did/do recommend 10W-30 or 10W-40 motor oil(and the rumor is they still do for "temporary use").

http://www.sabob.com/products/Genuin...8798_9031.html

Then there's some talk about a "new" and "old" Honda MTF formula too. And speculation that both probably ARE just motor oil with special additives(yet reports from some stating that they have that distinct gear oil smell).

Be that as it may, I still wouldn't recommend motor oil for a Toyota manual tranny(and neither would Toyota, which is of key importance here). But go ahead and give it a try. Just don't come cryin' to me when the shift hits the fan.(How'd ya like them play on words?)

Though, I will concede that it's probably more than sufficient for a Toyota transfer case. Ran mine with ~1/2 cup of muddy water for lube for a few months once(not purposely of course, it happened as a result of the front output shaft seal failing, then running her through a deep mudhole or two). Had to replace a few of the bearings in it afterwards, but other than that it wasn't significantly harmed by the experience.

kiyobrown

MudHippy

Duly noted!

Mr.Utah

Just finished my trans swap 30 minutes ago, I was thinking it might be a good idea to put some gear lube in, run it for a while, then drain it hot to get some of the junk out of the tranny. Is there some recommended way to clean or flush the w-56.

Thanks, I will appreciate some feadback.

Subzero2cirb

85-140 + lucas oil stabilizer. Its thicker to help quite the trans and tcase down plus doesnt leak as easily and or let in water as well, I had an L45 and she was a GRowler put in 85-140 much quieter, then aded lucas even quieter and shifter smoother, no hard shifting ITS a toyota 4x4 trans for crying out loud not a maseratti these guys can use some thicker lube to help with the slack caused by abuse and high mileage. i also use it in my w56 now and even after my 4.7 install. the tcase even whines waay less with 85-140 and lucas now takes around 5-6 hours of solid wheeling to start whining at all.

ephwang

Redline MT-90

sebastianholmes

Protip: When/If you start your truck to warm up in the morning put the transfer case in neutral and the transmission in first it will warm the oil in the tranny up and smooths shifts right off the bat