i just bought a 90 ford f150 super cab, 2 wheel drive, 5spd with a 300 6cylinder.
was wondering if anyone new what kinda fluid the tranny takes and rear end ?
great forum this is actually my first ford. and second post

ive always been a gm man, but figured it was time to try something a bit differnt. so hopefully it will go well ;p

 

Welcome to Ford Country. The 300 six is a workhorse engine and will serve you well. Also, you have found the best Ford truck website around.

Your tranny should be the same Mazda 5 speed as mine (but could possibly be a ZF) and so probably takes the same as my '95: Mercon ATF. (Check your owneres manual if you have one.) You can run Mobil 1 ATF which is rated mercon. Autozone it's $5 usually. Why not spend the bucks for the true synthetic since it stays in their a long time. I ran Mobil 1 for 40,000 miles but just put in Redline D4 Synthetic ATF at $8 per bottle. Redline is supposed to be the best and the D4 probably has more antiwear additive than Mobil 1. If you don't get really cold winters, might try Redline MTL (Manual Tranny Lube) as it is thicker and supposedly will help in smoothing shifting.

Hint: use a tube to fill it with a funnel under the hood. I used clear plastic tube and could see it going in the tranny while pouring from under the hood. Had to jack one side up to get all 3.8 oz in as the tranny slants down to drainhole part.

Keep eye on three plastic plugs on top of tranny, facing rearward, just before the tail piece of tranny. Many say these can develop leaks and cause low fluid resulting in failure. Mine are fine at 112000 miles though.

Finally, don't take my advice until you hear from some more of the folks on this site. May also want to search posts on the tranny section of this site.

 

Tall Paul is right on as far as the tranny. I replaced those plugs on mine at 140k since it was leaking. Turned out it was the shift boot that had cracked, but I replaced the plugs while I had things apart. I used Mobil 1 ATF.

As far as the rear end. use any 80w90 or 75w90 GL-5 gear oil will do fine. I put Mobil 1 synthetic 75w90 in for added protection. I figured it was worth it for something that doesn't take much oil and need to be changed very often. I also tend to haul heavy loads and figure it will help my wheel bearings out a little.

 

Oh yeah, forgot about his rear end. I put Valvoline Synpower 75w90 in both my pickup and wife's Aerostar. But after learning about Redline, I put their 75w90 in the motorhome rear end and would have done Redline in the others had I known. I think for the gear lube, Redline is cheaper than other synthetic (about $8).