I was going to drop the pan and change the automatic tranny fluid and filter in my 95 Dodge V10 pickup. The books say to use ATF plus tranny fluid. Will ATF plus4 work? I just wanted to make sure it won't hurt to have it mixed with what is in there now.

Thanks in advance,
V10

ATF+4 is a bit more slippery vs earlier fluids. It may work OK or not. I would suggest the recommended fluid.

As I recall, +4 was backward compatible with +3

http://www.allpar.com/mopar/transmissions/fluids.html

Robert

Yes +4 ATF supersedes Dexron and ATF III in Mopar applications. Go ahead and use it.

Thanks for the responses.

V10

It might be just fine, but I was warned by my step-father many years ago never to mix transmission fluid since some combinations can "foam"..... for whatever that's worth.

ok then based on the article -

1) “The previous MOPAR ATF+3® formulation was discontinued in 2005 and ATF+4® is recommended for all transmissions filled with ATF+3®.”

2)"You can use ATF+3 with all older Chrysler transmissions"

then i should be able to use 4 in my 1969 727 right?

and what is meant by 'shearing'??

While mine was leaking profusely through the shifter seal I was topping mine off with ATF+4. But it's driven VERY little. I've had the leak repaired and fluid changed, the shop filled it with a "global synthetic", I've seen the spec sheet, it's compatible with everything, including things that are incompatible with each other?

Check it out:

http://www.service-pro.com/documents/WarrenSpecs/WA-GlobalFullSynMulti-VehicleATF.pdf

I dunno whether to leave it in there and be happy or what.

Robert

ATF+4 is perfect for your truck. +3 was replaced because it broke down around 30k. +4 is fill for life. Good luck

The ATF+4 is good stuff, backwards compatible too.

There is a SAE paper on ATF+4 performance versus the three other common trans fluids

http://dastern.torque.net/techdocs/nonlamp/982674.pdf

It is worth noting that ATF+4 will allow clutches to slip earlier.

See Table 10 and Figure 9

This is probably only important when friction materials and clearances are worn.

Other figures in the paper show that ATF+ has an improved life, and has special torque converter "shutter" characteristics.

If you don't have a lockup converter or OD, you're wasting your money on +4.