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Originally Posted by TPford
1) Should I use Mercon V or switch to Synthetic ATF?
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Why not kill two birds with one stone? Mobil 1 ATF is both synthetic and MERCON V. But almost all brands of MERCON V will probably be at least semi-synthetic. That's why it costs more than cheap ATF.
If you tow more than a rowboat, then you should probably use synthetic. Synthetic ATF can take the heat of heavy towing without deteriorating.
Warning: Do not buy any brand of ATF that claims it "can be used" in anything that rquires MERCON V. Be certain it says it meets the specs for MERCON V, or maybe "approved by Ford". Several major brands of ATF now claim it "can be used" where MERCON V, Allison, or even MERCON SP are required. Baloney. Nothing can meet the MERCON V specs except MERCON V ATF. However, MERCON V can be used where MERCON is required, so it's okay if it says it can be used where MERCON or DEXRON III is required.
To be safe, stick with either Motorcraft or Mobil 1. Then you'll know you have the real MERCON V. I use Mobil 1, and last time I changed the ATF it cost me $6 per quart at Wal-Mart - or $120 for 20 quarts.
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2) For added filtration, should I add a Magnafine filter and/or a Remote External Filter?
My tranny has 137K and was rebuilt a 100K.
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If your tranny was rebuilt by a Ford dealer, then you already have a Magnefine in-line filter. You should change that filter every time you change the ATF, or at 30,000 miles, whichever comes first. It should be in the "rubber" part of the cooler return line over the front axle. If you don't already have a Magnefine in-line filter, then the folks that rebuilt your tranny didn't follow Ford requirements.
You can get one at any Ford dealer. Or if you plan ahead you can save a buck and order the 3/8th inch size direct from
Magnefine Filters--Online Order Form
