I'm concerned about transmission life now... Mine is a 4R75E, and it "learns" driving habits and loads. I'm just now sure about increasing line pressure on a trans that adjust shift firmness on it's own depending on your driving and pulling a load.

 

The transmissions are 4R7xW/E

Wide ratio / Electronically controlled.

 

Well, yes. They are electronically controlled... but thats just the two shift solenoids, the torque converter solenoid, and the pressure is electronically controlled as well by the EPC (Electronic Pressure Control) valve, but the PCM can't tell what the line pressure is.

This is exactly why the transgo shift kit I bought has a EPC relief valve modification included. So that the line pressure can't accidentally go high enough to cause a failure in the transmission.

There is no sensor to tell the pcm that the line pressure is anything different than what is commanded by the EPC, so this is why theres no way for the pcm to adjust to the changes made by a shift kit and revert the shifts back to stock.

Not trying to be a douche or anything lol, just trying to clarify. I'm no expert so I could be wrong, but I believe I'm right on this.

-Erik

 

I just don't understand why so many people try to use a tuner to firm up the shifts when they are just being cheap and lazy by not installing a shift kit)...

 

You said it right there!
I think the bigger issue here is a lack of knowledge. Tuner companies promise huge results with there transmission tunes, and for those who are none the wiser? Like me? Well... for all we know, that is all there is to it!

 

Will a shift kit cause any excessive wear on a transmission?

 

The only good thing about snipper is that they will no mess with when you return it. I delt with pat for over a week on the phone online and nothing. I took the truck to a real tunner. Snipper is for stangs only!!!!!!!!!! Pat one of the co owners is being sued by super chips where he worked before!! Hes a nice guy but a least 6 months ago they dont know S$#@ about these trucks!!! Also you can buy it direct from snipper at pdqwarehouse.com or pdqperformancewherehouse.com.

 

nope, it is the mechanical fix for sloppy factory shifting as making it firmer with the tuner is just a bandaid on the real issue

 

we figured it out in 2-3 hours. never had a prob. seems to work just fine on our trucks. mustangs only eh? my motor is a mustang motor just in a truck.

What year did you try tuning? they havnt come out with the update for 04+ yet i dont think.

 

My 06 5.4 sniper tuned runs great! I'm still waiting on the tranny update, but every thing else fine.

 

Thats exactly the point I was trying to get across tarajerame! lol I was trying to explain that the tune only makes shifts firmer by line pressure and that this eventually helped in the death of my tranny lol... So this time around I'm installing a trans-go shift kit to get proper shifts the right way.

As for shift kits causing wear on the transmission, it's quite the opposite. The shift kit is designed to cut the shift engagement time in half to make the shifts firmer and at the same time the shorter engagement time on the clutches greatly increasing their life. The longer the clutches are in the engagement state, the more wear, as the friction plates are essentially grinding against each other while not fully engaged.

- Erik

 

The discussion is between avfrog and myself is about PowerPC transmission controls on the P221, not the old stuff.

 

 

Oh, alright then. I know nothing about the PowerPC controls. I was just responding to your post on how a shift kit would make no difference and the pcm would return the shifts back to stock. That just made no sense to me as the 4R7XW/E transmissions can't adjust to compensate for a shift kit from factory. So if the PowerPC controls can do this, which I've never heard of, then sure that would make more sense lol.

While were on this, I'm curious as to what your talking about in regards to the PowerPC controls. Is this a separate transmission controller or something?

- Erik

 

Based on the time it took to complete a shift, it can change the transmission pressure to achieve the desired time. The same PCM handles the in the 4R7x transmissions.