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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Feb 2001 Posts: 81 Shop Shark | | Shop Shark Joined: Feb 2001 Posts: 81 | I have a 62 1/2 ton Chevy with a 235 six engine and standard three speed transmission. I have always used 80/90 weight trans grease but in cold weather it is somewhat difficult to shift until the truck warms up. Would changing to a similar weight synthetic grease help? I don't want to cause damage to my transmission !! Thanks for any thoughts. Edabbs
Green Machine
| | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | I've been using a 70/30 mix of Lucas 75w140 synthetic and Lucas Oil Stabilizer in my 318/overdive, it's working very well. Shifts just fine in all temps.
Bill Burmeister
| | | | | Joined: Aug 2005 Posts: 341 'Bolter | | 'Bolter Joined: Aug 2005 Posts: 341 | If you want easier shifting when cold a 75W-90 GL-4 manual tranny synthetic gear lube will work just fine.
Allan
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1951 GMC 1/2-ton
Two 1953 Chevy 3100 5-window
| | | | | Joined: Feb 2001 Posts: 41 'Bolter | | 'Bolter Joined: Feb 2001 Posts: 41 | You can use a tractor transmission oil of whatever viscosity is appropriate for your temp. ISO 46 would work well in the cold. Here is a link showing viscosity conversions. Stan S. www.bobistheoilguy.com/visc.html | | | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | I use 50W synthetic everything. It is required to preserve the warranty in our Fuller/Eaton and Meritor transmissions and I use it in my old jalopies as well. We have some transmissions with a million miles on them and they still look good. | | | | | Joined: Aug 2007 Posts: 1,859 Grumpy old guy playing with trucks, cars, and boats | | Grumpy old guy playing with trucks, cars, and boats Joined: Aug 2007 Posts: 1,859 | Stan ISO 46 is hydraulic oil. you would be closer to ISO 260 (SAE 50) or ISO 320 (SAE60). UTF (Universal tractor fluid) is simply mineral based hydraulic oil with viscosity modifiers and is used in everything from the transmission to the hydraulics to the axles on a transmission. It is generally a bit thick for hydraulics and a bit thin for axles and transmissions, however it is intended as a compromise so there is only 1 fluid used for service.
I'm with Crenwelge, Synthetic SAE 50 makes transmissions happy.
The problems we face today can not be addressed at the same level of intelligence we were at when we created them - Albert Einstein Or with the same level of $ - Me
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