wrote in message
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My son in law had a Ranger, I'm guessing '95 or so, had the Mazda four
cylinder with manual tranny. Well, the tranny started leaking pretty
badly out of the rear seal, and he had a friend that put a junkyard
tranny in it. He filled it with gear oil, like most manual trannys.
Well, when everything cooled down on the truck at night, the next
morning it was very hard to shift. We did a little research, lo and
behold in the shop manual, there it was. The manual tranny used ATF
fluid as a lubricant!
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I had the same experience with an '87 Ranger, except it was done by
Jiffy-Lube.
They did their typical sales routine and recommended changing the
transmission gear oil. I stupidly agreed.

The high school kid working there after school drained out the ATF and
filled it back up with 90 weight gear oil.
The next morning I couldn't put it in any gear until mid afternoon when the
temperature warmed up.

Eisboch