pull your tranny dipstick out. it should say what type of fluid to use on the dipstick, my 77 f250 says type f, but i have seen others that say to use mercon. but id do what the dipstick says. if it says nothing, id use type f. thats what all my trucks get.
Untill next time, I leave you with these words of wisdom...
i made this mistake. i read the books and assumed my auto was a c4 behind my 302. blew a cooler line *ghetto rigged i discovered* bought and put in type F and later correctly identified the c6 via the pan, changed the fluid and filter and have ran mercon ever since. haven't had any problems post rebuild *cooler was COMPLETELY clogged, hence the blown line* running mercon. as far as i've ever read, the c6 has always used mercon.
One child left...
'79 f100 "Silver Bullet" (my baby)
Got a 79 C6 with over 205,000 miles, flushed twice using type F, never a problem and no leaks. While my engine is being rebuilt, I've had the tranny rebuilt also and will go back with type F unless the rebuilder says otherwise.
I found this on Mobil 1's site for what it's worth. Personally I think I would go with the F for firmer shifts if it were mine.
The frictional characteristics of an automatic transmission fluid are an important factor in the design and operation of the transmission. All Ford Motor Company transmissions built prior to 1977, and certain models that continued in use during 1977-1980, were designed for a high-friction fluid that allowed the shifting clutches to lock up or engage quickly. Ford specification ESW-M2C33-F covers this type of product, which is commonly referred to as "Type F" fluid. Mobil ATF Type F is the appropriate product for these units.
These Ford vehicles are identified as:
All 1976 and earlier Ford, Lincoln, and Mercury models of cars, vans, and light trucks.
All 1977-1980 Ford models having either ESW-M2C33-F or no number at all stamped on the transmission dipstick.
Mobil ATF Type F is not recommended for automatic transmissions in Ford, General Motors, Chrysler, American Motors, or any other cars requiring a Dexron-II, Dexron-IIE, Dexron-III or Mercon-approved fluid, or for those Ford products requiring an M2C138CJ (Type CJ) fluid or an M2C166H (Type H) fluid. For the above applications, Mobil ATF D/M (Dexron/Mercon) or Mobil Multi-Vehicle ATF are recommended.
1973 Ford F100 Ranger 4x2 Reg Cab LWB 468, C6, 8.8 3.08 LS
1995 Ford F150 XLT 4x2 Reg Cab SWB - Stroked SEFI 352c.i. 5.0, Eagle Crank & Rods, Ported GT40 Heads, 1.7 FMS Roller Rockers, Manley RaceFlo Valves, Custom .060 Speed Pro Hyper Pistons, Comp 270HR, Ford Shorty Headers, 2.5 Mandrel Y, Magnaflow Duals, MSD, Moates QH/BE, Innovate LC1 Wideband, '03 4r70w, MarkVIII fan Conversion, Bosch EV6 24#, e85 Powered, 3.55 LS
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