Well, I drained the trans and the nice-looking Amoco 90wt had a caramel foam on top. Filled it with NAPA 90wt mineral and after slipping out once a mile down the road it didn't slip out again on a 12 mile ride. Drove it again later and it stayed in 3rd the whole way. Hopefully the change did the trick. Think I'll dump the rest of that Amoco down a groundhog hole.

~~ Jethro
1954 3100
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In the Dity Gallery
1951 3100 (gone) / 1956 4400 (still in the neighborhood) / 1957 6400 with dump body (retired) / 1959 3100 panel (in the woods junked) / 1978 Custom Deluxe K10 / 1993 S-10 4.3 / 2004 Chevy Crew Cab / 1945 John Deere H / 1952 John Deere B / 1966 John Deere 2510 / 1967 John Deere 1020