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Rustystud. I did not just pull the motor oil stuff out of thin air. Someone posted the Spicer documentation on this site. I have had no luck finding it to link to this thread. After I read that Spicer recommended 30, 40 or 50w engine oil I decided to try it. I went with 40w because it was what...

I have been using 40 w motor oil for over 3 years in a daily driver. I hope going back to gear oil helps you problem but these transmissions were designed to run on engine oil.

Also there are so many Zinc additives out there, how about some recommendations please.

2000 miles. I actually pulled the heads to look at my liners. still see hone marks. The advance mechanism in my injector pump ground itself apart. I believe that is where the high iron and aluminum came from.

My lead was at 31 and tin at 8 Blackstone says they should be about 27 and three but they did not flag them as scary high. Now my iron was at 247 and aluminum at 48 but I did have a injector pump grenade on me.

The info on the needle bearings comes from the guy here that makes the taller fifth gear set for these transmissions I can't remember his handle right at the moment. The Motor oil comes from the manufactures own literature. You will find a lot of folks have gone back to 40 or 50w and have seen a...

The extreme pressure additives in gear oil have been known to take out the small needle bearings in these transmissions and also affect the synchro operation. That is why the manufacture specifies motor oil. But the truth is most don't get enough miles on them to matter. I have driven my truck 5...