I'm a new owner of a 1968 F100 with the Ford light duty 3 speed manual (3 on the tree). I've read a lot about how newer fluids could attack (brass?) synchronizers...so I'm wondering what is best fluid for this old transmission.

Any help would be appreciated. I want to treat the truck right

Erik

 

It's called "Gear lube " not the same as automatic transmission fluid . Most of the time depending on your driving habits and temp. 80W/90 or a little heaver if in hot , desert conditions. Have you ever thought of going in to a parts supplier like NAPA or Auto zone and look at the lube containers or ask at the counter ?

 

I use Royal Purple 75W90. May be overkill, but it has served me well.
Buy Royal Purple Max-Gear 75W90 01300 at Advance Auto Parts

 

Yes. I did get the brilliant idea to go to an auto parts store before seeking out sarcasm on the internet. The problem is the counter folk handed me GL-5 gear lube, but couldn't address the affects of newer GL-5 gear lube on an old transmission's synchros...which is the point of my question.

 

______Call it "sarcasm" if you want to but it was a question and helpful suggestion only because some people don't know to do that. Besides i have no idea how much you know about trucks and cars. It sounded like it was all pretty new to you . Not a real good way for you to start out on a new forum with you second post . I won't be helping you in the future for sure .______Your first post was a ----question.____Dump what ever you want in it .__




.

 

I bought a case of it on Amazon because non of my local stores carried GL-4 is the stuff I got

 

Thanks for the suggestion.

 

You're right. My apologies. I got up on the wrong side of the bed and started typing before coffee. Totally wrong approach on my part.

 

Ha Ha , sounds like you will make it here, i'm the one that will probably get booted off first.____ The older i get the less patience i have and i'm one of the oldest ones on here. But i'm not really that mean. So i will now say my ,welcome .__

 

Valvoline 80w90 or Lucas 85w140.

Btw, it (the lube) smells that way because of the high sulfur content. It is what cushions the mating/meshing surfaces.

The pump I used decided to pop off its tube and I got caught in the line of fire... It's really hard to get the smell out of clothing so wear your grubbies or exercise prudent caution.