T176

[1980cj5]

What gear oil is recommended for the T-176 ? I've read that GL5 gear oil will harm the yellow metals? Is Stalube 85W-90 from NAPA any good? Novak Says any good GL5 80-90W?

Any help and advice appreciated!

 

[Belizean]

 

[Scout1067]

I have the T-176 in mine and I am running 50w oil in it. I used to run 80W but that caused some issues in the winter where I live and since I switched to 50W those problems went away. FWIW the Manual calls for 85W-90 GL5.

 

[Belizean]

I just rebuilt one, but have not installed it yet. Was hoping we would get some more responses

 

[Scout1067]

I just rebuilt one, but have not install it yet. Was hoping we would get some more responses

I rebuilt mine this past March

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[1980cj5]

Thank you Scout1067. Good, Bad or Ugly....I decided to go with 80W90 Valvoline GL5. I'll be changing it tomorrow. Fingers crossed.

 

[Scout1067]

Keep in mind that if you don't have something to direct the oil away from the drain plug when you drain the oil it makes a heck of a mess. The skid plate is just long enough that it is a total pain to drain it. I ended up rigging up a makeshift funnel out of thin cardboard and foil when I drained mine. It aint pretty but it keeps the oil from pooling on the skid plate and finding creative places to drip from.

 

[Posi]

The T-176 takes 3.5 pints of GL4 (Stalube) 85-90 or GL5 80-90
I use GL4 in my T-18 .
I would use GL5 for the T-176 because its less expensive.
Either one works.

 

[Belizean]

Not to cast a fly in the ointment but I used GL5 80-90 for 35 years in a T-4 and never had a lick of problems for 238,000 miles, but several / many said because of the brass synchros that was the wrong lubricant and I should use GL4

 

[Scout1067]

The OEM manual calls for GL5, just sayin'

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[Posi]

I don't doubt the service manual states GL5 for 80s manuals, that's why I said either GL4 or GL5 will work.
The service manual states GL4 for a T-18 .
There is truth that sulphur/phosphorus can be corrosive to yellow metals however, we're talking a fine coat wearing off.
In the real world there isn't a way to distinguish the yellow dust you may find when changing gear oil to say if it was normal wear, severe use wear, or wear from using GL5.
I buy GL5 by the 5 gallon bucket and use it in all my older Jeep's axles and transfer cases. The times I don't have GL4 handy for my transmissions I'll use GL5 in those as well until the next lube change when I do have GL4.