I don't think there is a need to change the Filter, it can't hurt to be sure though.
ATF+3 is the earlier version of ATF+4, I'm NOT positive, but pretty sure, both fluids have the same properties, as all ATF+ versions do. Its just the later the ATF+ version, the better the quality and LONGER LASTING under severe usage, is the fluid.
The very troublesome A604/41TE (the first fully electronic transmission) is the reason Chrysler came up with the ATF+ series of fluid, that they later switched to all their transmissions, even though they were NOT so demanding on the fluid as the A604/41TE was. So there is an argument that other transmissions, NOT as demanding on the fluid, don't need the higher quality of ATF+4, but I wouldn't risk experimenting with fluid on something as expensive as a Transmission.
SO, unlikely he did damage in only a couple hundred miles, in fact I would NOT be surprised if the ATF+3 could stay in the trans and it continue to work fine, it just wouldn't last as long as ATF+4. BUT, how expensive a transmission is, I would NOT risk it.
Your friends problem is, the transmission pan holds less than half the fluid capacity of the trans, and it mixes with the rest of the fluid. So changing just the fluid in the pan would remove less than half the ATF+3 already mixed with the rest of the fluid. Read the problems/Dealers forum, the trans flushes are recommended AGAINST by Chrysler and guys that have had them done, have experienced problems.
My suggestion, ATF+4 is cheap enough (OK, I'm in the States, it might be expensive overseas), have your friend buy an entire case, and a couple of extra quarts. Change the trans fluid with ATF+4, just in the pan, drive the vehicle for 10 miles or so. Change it again, repeat, until out of fluid runs out, of course get enough to bring it to the proper fluid level.
You change the fluid 3 or 4 times, you've fractionated the remaining ATF+3 down enough there will be nothing to worry about.
An alternative for you friend, he could just change fluid once with ATF+4 now, then pull the next trans fluid changes twice as frequent for then next 4 changes, I'm sure would work just as well.
BTW, ATF+4 is Synthetic, while the earlier versions are Conventional based Oil. Don't worry, conventional and synthetic oil mix just fine, including transmission fluid, which is mostly thin motor oil with a different additives package.
Pretty sure ATF+4 is the GroupIII Synthetic, NOT GroupIV. Thats another American broken legal system's gift to the world, the word "Synthetic" is just a marketing term now, you can label anything you want synthetic now, well you have to argue it has gone through some synthesizing process. I can't wait until the dairy industry figures this out and starts to relabel homogenized milk as Synthetic Milk.
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Last edited by Mongo; 01-08-2011 at 09:10 AM.