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There is no recorded empirical evidence to suggest that using ATF Type F will cause early failures in the M47 (or M46). In other words the fluid doesn't kill the trannies....the design does.
That said (written?) you can EXTEND the life of the well known to be fragile M47 by using a synthetic lubricant. Synthetic ATF if you live in truly frost bound places. Or a lighter SYNTHETIC gear oil any place that does get to -30°F or below. This idea did not originate with me. Someone or Redline oil thought MTL synthetic gear oil would work well in the M46/M47. That person was right...it improves shift feel dramatically and you get vastly improved gear life, better flow, less resistance, super long lube life...all the beni's of synthetic gear oil.
Again never try this with petroleum based gear oil.
Also remember that gear oil weights are not equivalent to motor oil weights. Compare properties of petroleum ATF to a good synthetic 75W-90 gear oil.
MTL is about a 70W-85 gear oil. MT-90 is a 75W-90 gear oil. Both are synthetic, both made by Redline and both recommended by Redline for the M46/M47.
Amsoil Series 2000 75W-90 has flow properties almost in between the two. The pour point is -51°F. Most all properties are the same as ATF F PLUS again all the hugely benificial attributes of synthtetic gear oil. I was just driving at 14°F with NO problems shifting in and out of OD. I guess I can't recommend it strong enough in the M47. It will extend the life, I have NO doubt about that.
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