7.3L Power Stroke Engine and DrivetrainDiscussion of the 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.
My neighbor owns a 2002 F350, he changed his transmission fluid at 20,000 miles, 45,000 miles using mercon. At 70,000 miles he put the new Mercon V in and now at 81,000 miles his transmission is trashed. He never towed anything heavier than his riding lawn mower. He is convinced that the new Mercon V Killed his tranny. Coincidence? or is the only thing new about Mercon V the label? I was about to change my transmission fluid using the new Mervon V but now I am a little freaked out about using it. Anyone heard of this happening? Anyone used the new stuff and put on any real mileage yet? What can you use besides the new Mercon V?
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2003 7.3 SD, CC, 4x4 with FX4 package, white and 100% stock
Your neighbor has a 4R100 tranny, he should use Dextron/Mercon not Mercon V (5) . Pretty sure I read this somewhere in Fords bulletines. He should read his manual, that shows what tranny fluid to use. Safe way is use synthetic ATF.
You can still get the Mercon/Dexron III dino fluid. Look at Sam's club. It says something like "for use in vehicles requiring Mercon/Dexron III fluid" on the bottle. The Mercon V fluid is supossed to be reformulated so it will work in our transmissions. I still use the Merco/Dexron III because I can.
Joe
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2002 F350, Crew Cab, 4WD, ISSOPRO Gauges,
3.73, Auto, 2wd low range mod, No door dinger,
Interior lights off switch, Zoodad Mod,
Extra Trans Cooler, Before coolers trans fltr,
Coolant fltr, Crimestopper remote start/alarm
Oil Guard Bypass, Air horns
You can. I am in my 4R100, but only because I still have enough MERCON in my garage from one more change.
DO NOT use DexV!!!!!! That will most likely kill a Ford transmission. DexV is a GM fluid, who knows what it will do in a Ford?
Does that mean you will use the new Mercon V after you use up your Mercon, Mark? Are you have confident that the new Mercon V will not cause any damage to the 4R100?
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2003 7.3 SD, CC, 4x4 with FX4 package, white and 100% stock
Does that mean you will use the new Mercon V after you use up your Mercon, Mark? Are you have confident that the new Mercon V will not cause any damage to the 4R100?
Maybe.
The MERCON is going into the van in the next couple days. The van is used to tow the travel trailer, and haul other things. It doesn't get a lot of miles anymore. The wife is starting to make noises about getting a fifth wheel, and the van isn't going to tow it. If I still own the van when the next change is due I will use MERCON V.
__________________ Mark
Former Ford Trans Engineer 1988-2007
The MERCON is going into the van in the next couple days. The van is used to tow the travel trailer, and haul other things. It doesn't get a lot of miles anymore. The wife is starting to make noises about getting a fifth wheel, and the van isn't going to tow it. If I still own the van when the next change is due I will use MERCON V.
"But are you confident the new Mercon V will not damage the 4R100?????", He repeated.
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2003 7.3 SD, CC, 4x4 with FX4 package, white and 100% stock
Yes, I am confident that the new MERCON V will not damage a 4R100.
I thought I may have made that point when I said I would use it in my next change on my 4R100 if I still own it then, but I must not have been clear.
Thanks for the reply, Mark. I was not sure if you meant you were going to use it just because you did not drive it much and inteneded to sell it. I trust your knowledge on this subject and wanted to know were you stood before I put it in my truck. I only have 80,000 miles on my 2003 and plan to keep it for quite awhile!
Thanks again,
Ben
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2003 7.3 SD, CC, 4x4 with FX4 package, white and 100% stock
I recommend mobil 1 synthetic, available at walmart for under $6 per quart. Start stocking up on it, because you will need 20 quarts for the change, and walmart tends to have only about five on the shelf at a time.
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2001 F350 XLT 4X4, shift on the fly, 38 gal fuel tank, running boards, sliding rear window, black, crew cab, long bed, 4.10, automatic transmission, 11,500 gvwr, 20,000 gcwr, 7500 gvw, dual rear wheels, 7.3l turbo diesel, completely stock, 114,00 miles when purchased, now has 125,000 miles, repairs so far: starter, batteries, cps.
2005 Nomad Rampage toyhauler made by Skyline. 11,500lb gvwr.
If I still own the van when the next change is due I will use MERCON V.
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