mmcdowel Posted October 9, 2019 Report Share Posted October 9, 2019 Just wanted to make sure. I want to change the oil in my manual gearbox on my 1950 Dodge 1 Ton Book says SAE 90 for -10 and above (I'm in Central Oklahoma)....gets hot here. Is this still accurate or is there something new that works better? Not only do I want to change this because its time to do so, but when the gearbox gets warm (despite my doubleclutching technique you all helped me with) the gears still grind a little sometimes. When the trans is cold I can gear up and down with no issues. Just wanted some advice. Thanks! PS no whining or suspicious sounds from the trans at any time. Quote Link to comment Share on other sites More sharing options...
Los_Control Posted October 9, 2019 Report Share Posted October 9, 2019 I also bought a book and labelled it as pure porn, some day I should take the wrapper off and look inside .... I would imagine 80/90 weight was the go to for decades, what I plan to use. I imagine the 80/90 would be a little easier when cold then straight 90. I also suspect that we have modern synthetic oils that could replace the 80/90. I would like to follow this thread and see if others have a decent modern replacement for the 80/90. Quote Link to comment Share on other sites More sharing options...
mmcdowel Posted October 9, 2019 Author Report Share Posted October 9, 2019 Appreciate the feedback! I know I've read tons of conversation pertaining to this topic on here, but for some reason the search engine isn't helping me out much. 80/90 is prob the way to go. 80F or so here today, but 30F by tomorrow night. Synthetic might hold its viscosity better too......I'm anxious to hear what people have to say. Quote Link to comment Share on other sites More sharing options...
JBNeal Posted October 10, 2019 Report Share Posted October 10, 2019 The cheapest store brand gear oil will be leaps and bounds better than what was available back during B-series production...it will be cleaner out of the bottle and have stronger, more durable cleaning additives. Synthetics will give you peace of mind knowing ya spent more $$$ on something with negligible performance gains. Stick with what the book says to use to keep the bearings happy, thinner grades might start seeping out of multiple orifices...these old gearboxes were designed for work and durability, not for speed and efficiency, so maintain it as recommended in the manual...one subtle maintenance suggestion that I've picked up from multiple sources is to change ALL oils at a minimum of every other year...I believe this has to do with removing oils contaminated with condensation to protect bearings and gears from abnormal wear and remove emulsions 2 Quote Link to comment Share on other sites More sharing options...
mmcdowel Posted October 10, 2019 Author Report Share Posted October 10, 2019 Excellent and thank you! Will do Quote Link to comment Share on other sites More sharing options...
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