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Having just gone through my trans and checking it out per the tm and replacing the 4th 5th synchro I would opt for fixing yours, they are not bad to work on and as stated by others, I could have pulled the mainshaft without removing from the truck, I had a replacement lined up if needed but...

NAPA part 65-205 is their GL1 and they either have or can get it readily that's what I went with

not sure of the lucas additive yet some of the well thought out posts indicated the possibility of the older oil containment system failing with the climbing gear action of the additives, my first thought that reverse thread on the input shat without any seal, lucas on the clutch would suck for...

has the GL1 from NAPA in it now used 85-90 as a first run and flush to get out any little bits I left from the reassembly, shifts good, pretty quiet still wonder how hot it will get in the long run. May drive for a while and shoot the case with the ir just to see

looks like napa 65-205 fits the bill will be getting some of that in wanted to do a flush after putting trans back together and running an little while

just when i thought it would be simple another user points out the original spec. I know 50 wt motor oil roughly crosses to 90 wt gear after reading extensive posts on the subject and have read of it being possibly relabeled as in smittys super syn 50. Around here in Chapel Hill have yet to...

Been reading and reading, some purist say only use what the govt. spec'd for the transmission, others say times and lube have changed use latest and greatest synthetic, others say synthetics ruined transmission shortly, still others say use any gl5 mt-1 rated and everything is peachy. wieight is...