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Thread: GL-1 Gear Oil Alternative

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    4 Star General cattlerepairman's Avatar
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    Before we tear shreds off each other, perhaps it is worth asking whether there even exists the one right answer to the question asked about which gear oil is best for the Spicer 3053A transmission. It may well be that there are several options that are not easily distinguished being "better" or "worse".

    If there are, indeed, two or more options that can be valid, it creates nothing but churn and hard feelings if we continue to try to nail down "the right one". Thank you.
    MVPA member. 1974 M35A2C w/w "Queen Lola", rebuilt LDS-465-1A, "D" turbo, Waterloo Overdrive upgrade. Med towbar, 11.00R20 Goodyear G286, flipped hubs, remote brake fluid reservoir, spin-on filters, bypassed FDC, LED taillights, LED headlights, LED turn signals, WESTACH EGT/boost gauge, AVM lockout hubs, LED convoy light, LED lollipop lights, HMMWV seat on air ride base, M211 dash passenger grab handle, hood lift kit, 24V solargizer/battery minder, ether start kit, flasher module mod, heavy duty dog bone ends, M35A3 aluminium fuel tank.

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  3. #202
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    I apologise if I reopened the can of worms thread. I for one appreciate All of the advice and info here. And understand every decision "I" make, about my truck is on me.

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  4. #203
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    Quote Originally Posted by cattlerepairman View Post
    Before we tear shreds off each other, perhaps it is worth asking whether there even exists the one right answer to the question asked about which gear oil is best for the Spicer 3053A transmission. It may well be that there are several options that are not easily distinguished being "better" or "worse".

    If there are, indeed, two or more options that can be valid, it creates nothing but churn and hard feelings if we continue to try to nail down "the right one". Thank you.
    I agree cattlerepairman. That is why I said I did not think running 80/90W oil is bad. I ran it for decades in my trucks and in trucks I serviced over the years. It was after the "great oil debate" that I finally changed my mind.

    (last sentence removed)
    Last edited by gringeltaube; 07-17-2019 at 10:42.

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  6. #204
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    Dizzying thread. Back and forth like a jeep thread about which is better - GPW or MB.

    Not a truck experience, but I recently switched the 80w90 GL-4 in my jeep trans and TC and put GL-1 oil in it, marketed as Ford tractor transmission oil. Very inexpensive at Tractor Supply. Took it on a 80 mile road run of twisties, hills, 45 mph stretches. First impression was the synchros worked a little smoother, BUT I couldn't shift from neutral to first at one stop sign without rolling the jeep back a foot, and later it wouldn't go from second to third when driving which has never happened. Double clutching made it work and then went back to working when single clutching, so a random issue. My trans is old and pops out of second so I could have more serious trouble than oil issues. This and reading this thread got me thinking that two of the same models of trannys can be different enough inside so that a lube that works the best in one might not be great in the other.
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    The reason I use gl-1 over gl-5 in my spicer transmission is because the manufacturer does not recommend the ep additives present in gl-5. These transmissions have had gl-5 in them for twenty years without any issues. That to me is proof enough that gl-5 is safe to use. Assuming yellow safe of course. But just to satisfy my OCD, I will continue to use gl-1 or straight weight 30,40 or 50.
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