Does it hurt to put Type F tranny fluid in a Mopar instead of the Dexron?

My transmission man told me to use type F, he said it would make it shift better

I run Type F in my 727. When Pete Tritak rebuilt it for me that is what he told me to use. I didn't argue with him.

Yes Type F is the accepted grade for performance 727/904's something to do with the grit factor being higher for firmer shifts. Most if not all performance transmission builders will recommend Type F like one builder told me don't was your money on trick shift just use type F!

One of the regular village bragarts over on the slantsix board was bashing the use of Type F fluid in Mopar transmissions. He claims it degrades the bands and clutches because in the petroleum based form, it can't handle the heat as well as Dexron 2.

While there is some truth to the temperature rating of petrolium Type F as compared to petrolium Dexron, the thermal problem goes away when you switch to synthetic Type F.

In the synthetic form, the Type F can handle much higher thermal loads while still providing enhanced thermal stability and lubricity than petrolium transmision fluids, regadless of the type of fluid ie Dextron or Type F.

If you are going to use Type F, pay a bit more and run the synthetic Type F.

Synthetic is not necessary in Mopar transmissions. Regular type F works great to give firm shifts and doesn't break down under normal temps.

to be quite honest ive used both in the same transmission and have noticed no difference in either in shifting quality.

and to be quite honest ive used whatever was available in cases with no ill effects.mixing one with another,i know your not suppossed too but,kinda like the power steering pump,ive used what i had to at times with no catastrophic failure. so no ,using type f is o.k.

Well I just dumped some coin on my trans last year and the builder said to run Dextron in it...I'll go by that.

Got a Torqueflite that's been living on Type F for 20 years...

It's been subjected to beaucoup heat-more than once...

As far as 'band and clutch degradation'???

Just had the pan down not too long ago...

Looked just like it did when I bolted it on...

I asked this question about a month ago and got the same feedback. I had the converter out of the car and decided to do a complete drain of the trans as well. I like the feel of the trans with the type F. It does shift firmer. the fluid was cheaper too. I can that a win-win.

I'll try it in my 69 Super Bee. Thanks very much for the input.

We've used nothing but Type F since 1977..never any problems with it.

I was told 35 years ago, Type F only in mopars. That's all that I've ever put in them. I don't know as though Dextron would hurt anything, but Type F for me.

well i hope type F doesnt have more grit----hoping it is less slippery....bob

I have a good supply of ATF+4 since I worked at a Dodge dealer for 24 years. All my brother and I have ever used is the Mopar ATF+. It shifts great and looked like brand new when I dropped the pan. I dont think I will drain it and add type F to see if it is any faster. Ron

Type F was developed by Ford (hence the F) to help their auto trans shift more crisp like the Chrysler and GM autos I was told. Type F has less "cushion agents" in it to achieve the firmer shifts. With less cushion agents it should shift firmer but not be a problem for other components that need lubrication. That's all they do with so called "racing automatic transmission fluid" is reduce the cushion agents to minimize the clutch engagement slip or cushion.

It's not about "cushioning", it's all about the coefficient of friction (the ratio of the force of friction between two bodies). Type F has a more aggressive COF.