4sp gear oil.?

[69GWC]

So what type of oil does the tranny use, I went to check mine and it seemed like it just normal oil and it seemed like to me it would use something more like gear oil.
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[Stocker]

Yes, it should be gear oil. My manual calls for either 80W or 80W-90 GL-5. On a more modern note, I bet you could use a synthetic 75W-90.

[69GWC]

Cool thanks, I thought it should and I bet its got 30w or something in it right now as it came out like thin oil.
Looks like I will be changing that tomorrow. Would you happen to know about how much it holds ? Hopefully it has not hurt anything being full of light weight oil.
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[Stocker]

Sorry, my Clymer's doesn't have oil capacities. If you can't find out how much it takes, try 3 quarts, and you might return one for a refund.

[69GWC]

Thanks, just bought a gallon so I will just pump it in till its full.

Iam sure its got some thin dirty oil in it kinda makes a guy mad when you ad up all the dumb halfA$$ stuff the PO did on this truck to sell it.
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[Stocker]

Originally Posted by 69GWC

kinda makes a guy mad when you ad up all the dumb halfA$$ stuff the PO did on this truck to sell it.

Not that it helps but you're in good company.... that seems to happen pretty often.

[69GWC]

Well it had ATF fluid in it. It does seem to be alittle quiter now and seems smoother driveing.
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[Stocker]

Wow.... some transfer cases use ATF but I never heard of a manual gearbox spec'd for it. Luckily it's actually a very good lubricant, but still....

Just got to thinking, I wonder if it could have been Redline gear oil? It's a synthetic with a reddish color.

Either way, at least now you know it has good fresh gear oil!

[69GWC]

Iam pretty sure it was just ATF , it smelt like it and was very thin allmost like water coming out..lol
It's all good now, thanks for the help with it.
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[JAA]

Did you ever check to see how much it held? Seeing this thread reminds me I probably need to check mine...

[69GWC]

Sorry I just pumped the oil out of a gallon jug untill it was full, the jug was pretty light when done I used over 3q Iam pretty sure.
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[obijuan]

fill till it pours out of the fill plug. put the one side up so you can get a little more in and help lube the input bearing.

[Hoods69BadBowTie]

Yea defiantly should be 80-90 wt. I seem to remember mine taking some wheres around 3qts. or more when I last filled it up. I hate dealing with po cheap fixes what a pain the ass haha!

[x ReAcT x]

I have the SM465 just like you and when I got them rebuilt i went out to town to pick up some new fluid and every parts place (advanced, napa, autozone...) said to put Dextron III (formerly DextronII) in the tranny. I just couldnt believe it. Called a couple transmission shops and they all said to use 75W90 or 80W90. Either one will work. I went with Mobile 1 because thats what all the shops recommended. The transmission calls for 5 quarts of gear oil. Make sure the transmission is level or youll only get 4.5qts in. Filled mine up last week and found out my mechanic forgot to put the rtv seal on.... but thats a different story. Good luck