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drewd

recommended oil for Uni-Drive

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drewd

I would like to change the oil in my transmission but have read some people using 40 weight and others 90.  What's the recommend oil for a 4 speed Uni-Drive Transmission? Thank you!

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Racinbob

:WRS:

 

I've used Valvoline 80w90 for decades and never has an issue so I guess it must work. :)

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rmaynard

Back in the mid 1960's, Wheel Horse recommended 40W oil for one model. I can't recall which one now. But as of 1998 when Toro printed the chart of recommended lubricants for all models and years from the RJ's to the late 1990's models, ALL uni-drives were recommended to use SAE 90-140 A.P.I. Service GL-5 Gear Lube. HOWEVER, that is not to say that a good 80/90W  or other similar gear oil won't work, considering that many guys are inadvertently running around with anywhere from a thimble full to over a half pint of water in the transmissions at any given time. Since 1993 I have been using Walmart's house brand in 80/90 or 90/140, whichever is on sale at the time I need it.

 

:WRS:

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Racinbob

It was in 1964 that 40W was recommended. Service bulletin #55 addresses it. The reasoning was to minimize 'gear locking conditions'. At the shifter rails continued to be modified the issue was corrected with the flats in the rails and they went back to recommending the heavier stuff. As Bob said, any good gear oil is fine. 80W90, 90W140 or.....

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SylvanLakeWH

:text-yeahthat:

 

And...:text-welcomeconfetti:

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pfrederi

The owners manual for my 1967 L107 specifies 40w motor oil. That has been used in her since then... changed maybe 4 times (probably about due), still in daily use winter and summer.....No tranny issues after 49 years. 

 

I really think this area gets to be "Over thought".  Keep the shifter boot on, don't let water get in and any of the lubricants mentioned will work just fine.

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roadapples

:WRS:

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Racinbob

I do agree with Paul on the over thought bit. Sure enough the L-107 calls for 40w. It has a 5053 transmission. Many others have the 5053 as well including my 500 Special. The odd thing is that my manual calls for 90W. But, the 657 also has the 5053 and calls for 40W. Apparently they made the switch in 1968. :confusion-confused:

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drewd

Thank you all for the replies!

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WHX??

Your :text-welcomeconfetti:

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gregg'shorses

I think 40w engine oil and 80/90 or 90/140 gear lube are about the same viscosity.

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