I was unaware of the GL4 vs GL5 issues and may have been using GL5 in my
TR250 transmission and differential.
I used Castrol Hypoy C Gear Oil 80W/90. I assume this is GL5 because the
label says:
"Castrol Hypoy C Gear Oil is a multi-grade gear lubricant providing
excellent performance in hypoid gears requiring a GL-5 lubricant"
" Meets the performance requirements of MIL-L/2105C, Ford ESW-M2C-105B
and Mack GO-G"
I also used whatever gear oil was at the service stations back in the
70's. When did GL5 come along?
Thanks,
Don Malling
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