Syncromesh

I know there has been a lot of discussion here about GL-4 trans oil. I have read all that I can find on this. I can't seem to find any of the specified choices.
has anybody used Valvoline syncromesh manual trans fluid? it says it is compatible with yellow metals, has phosphorus. here is a link.
http://content.valvoline.com/pdf/vps_manual_transmission_fluid.pdf

 

This is a good question I would also like to get an answer for. The best I can find is GL4/GL5. No straight GL4.

 

Synthetic. I've had mixed results but frequently poor with customers using synthetic oils in transmissions that were designed to use Dino oil. Don't be surprised if your transmission starts grinding going into gear if you try it.
Synthetics have their place but these old transmissions are not one of them imho.

 

The general concensus seems to be Sta Lube GL4
Available at NAPA, as well as other places.

 

Same here. Seems to be the cheapest too. I have wondered about the synchromesh fluid.

 

I just finished a T 18 big hole rebuild with a Novak kit and was just looking through past conversations about this subject. Now am scratching by bald head trying to make a choice. Looks like I will use Sta Lube GL4, is that right? I don't remember what I put in the T 90, so I will change all of it to the same thing when I put the new transfercase in next month.

 

Yes, you want the GL-4 specifically. It works the best assuming you aren't in an area with extreme cold.

 

Is the GL-4 what should be used in the axles as well?

 

Less important on the axles. GL-4 or GL-5 works fine in those. If you have a clutch type limited slip don't forget the friction modifier.

 

me too . and buy the pump . it works

 

Thanks guys, I just wanted to make sure which way it was, I read the thread about a month ago, but needed to hear it again. I really enjoy this forum, thanks again.

 

I found this at tractor supply. Its GL1 and is pretty reasonable.

 

More fuel for the GL4 Fire, 11 pages long...

http://www.widman.biz/uploads/Transaxle_oil.pdf

 

Wow! That is great info.

Anybody have knowledge about where 600W might fall in this discussion?
600-W Oil | Axle & Transmission Lubricant

 

To throw in another gear oil, anyone here using Swepco gear oil? The Porsche racing folks swear by it, and my Vanagon/Subaru crowd recommend one of 4 flavors offered for their overstressed transaxles.
I haven't tried it yet, but will be using it in the future. I understand it is dino oil as opposed to synthetic.
-Donny

 

So, what is a good choice for cold-country? I've seen record -58 degrees and the other way to +101 degrees.

Any recommendation for a T-98 transmission and a D-18 transfer case which would not be unusual to see -20* to +80 degrees.

 

Your T98 is an old truck transmission from 50 years ago, so don't expect it to shift like a modern gearbox. I would stick with a modern dino-based 85W-90 gear oil. Just expect it to be balky shifting from 30 degrees and colder.
Modern transmissions use ATF or thinner, but have tighter tolerences. The super thin oil allows shifting in cold climates.
-Donny

 

Factory Service Manual calls for 80w in winter and 90w in summer, both using GL-4.
If it shifts too hard in winter when it's reall cold you could use a 50w or 75w GL4 (ep) oil. The temp ranges you are talking about there is no oil for all conditions for these transmissions. Meaning you will be changing it from summer oil to winter oil and back again as temps change.

 

I used Napa brand 80w90 in my axles , trans and transfer case. All seems ok. It seems to shift the same.