Leeann wrote:
Eric Hysteric wrote:
Changed transmission fluid (6 quarts Mopar ATF+4)
The 727 does NOT take ATF+4. It takes Dexron. ATF+4 is for '90s and newer Chrysler transmissions with overdrive, which the 727 definitely is not.
The information in our service manuals is outdated, Leeann.
The guy who rebuilt my 727 only does Mopar automatics and is a drag racer. He and I discussed DexMerc vs Ford Type F vs ATF+4 as nauseam...his recommendations were that DexMerc (what replaced Dexron II, III & IV) is what you want, if you’re going the non-synthetic route.
If you want synthetic, ATF+4 is the best and works well in the 727...it’s what I bought.
Ford Type F is what drag racers use, due to the lack of friction modifiers, so the trans grabs every gear hard, but it builds up heat quickly and isn’t good for road use.
He said absolutely stay away from Dexron VI, because the engineers developed it for the new transmissions, but it sucks and is causing major problems for all the transmissions...rubber seals swelling and blowing out.
