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Jeep Wrangler YJ
YJ General Discussion
Safe for Yellow Metals GL-5
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<blockquote data-quote="deadpool1" data-source="post: 441154" data-attributes="member: 21229"><p>that is correct MT-1 is for Crash boxes,</p><p>I drove 1959 12ton dump truck in 1965/66 and it had 5speed and 3 speed "Brownie" behind it and was a crash box .that right 15 total speed. and used going up hill loaded, every time. or seen in school bus back then.</p><p>this word means , NO SYNCROmesh at all, zero . and we double clutched it. to shift, (practice it took to master it)</p><p>GL4 is best</p><p>but yes some GL5 have no yellow metal chems. to wreck them.</p><p>the old chems bad were sulfur and phosphorous. and not good to use at all in 5speed. here</p><p>and the percentage of sulfur does matter, if too much. it can eat the rings, and may only happen if water gets to the box or very humid tropics.(like)</p><p></p><p>there is no fast blanket answer, but 1, rear says API GL4. IMO. or the bottle clearly lists Synchromess in the lable.</p><p>GL4 is never used in Hypoid axles. The forces there in the offset pinion are <strong>huge!</strong>, and needs EP grade GL5/</p></blockquote><p></p>
[QUOTE="deadpool1, post: 441154, member: 21229"] that is correct MT-1 is for Crash boxes, I drove 1959 12ton dump truck in 1965/66 and it had 5speed and 3 speed "Brownie" behind it and was a crash box .that right 15 total speed. and used going up hill loaded, every time. or seen in school bus back then. this word means , NO SYNCROmesh at all, zero . and we double clutched it. to shift, (practice it took to master it) GL4 is best but yes some GL5 have no yellow metal chems. to wreck them. the old chems bad were sulfur and phosphorous. and not good to use at all in 5speed. here and the percentage of sulfur does matter, if too much. it can eat the rings, and may only happen if water gets to the box or very humid tropics.(like) there is no fast blanket answer, but 1, rear says API GL4. IMO. or the bottle clearly lists Synchromess in the lable. GL4 is never used in Hypoid axles. The forces there in the offset pinion are [B]huge![/B], and needs EP grade GL5/ [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Safe for Yellow Metals GL-5
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