07navi
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And Ford makes it hard to change oil plus says not to even do it...………..
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Years ago you could just unbolt them to open, and we used to rebuild them. Now some have clutches in there but none did before.I find this stuff so cool lol
Probably comfort, transmissions get softer shifting as time goes on. The 4 speed hydramatic of yesteryear raised the car every time it shifted due to the trailing arms connected to the rear end. Probably one reason the cvt trans got popular. (Like in my snowmobile).I wonder if 5 star tuning addresses the factory shift and lockup strategy. I’ve scanned a lot of complaints about this on the F-150 forums. I borrowed my dads 2016 F-250 with the 6R100 when I was doing the work to the Expedition and noticed the F-250’s initial lockup of the converter in the morning is very soft (program holds lockup until engine reaches operating temp). This means they are allowing the clutch to slip some as part of the program so the driver doesn’t detect the lockup without looking at the tach. It essentially is to make a more “seamless” shift.
Now that my 6R75 is all fixed up I have taken notice that the factory program is the same as the F-Series on the Expedition! That initial lockup when the engine makes temp is pretty soft and you have to be looking at the tach or have fine tuned feel to notice.
No doubt this softer lockup programming must produce some wear on the lockup clutch friction rings over miles on these 6R transmissions. Perhaps though there is some purpose behind it that I overlook as well. The questing is did Ford do it for comfort or utility? I’m betting comfort but I’m going to leave it alone.
Just thought I’d update: 6R75 Transmission has been flawless for the last two months since the reman converter install and fluid/filter change. If you lose lockup you don’t have to be in for a whole rebuild....mine did not have any burned fluid or metal inside. It seems that the piston inside the converter that locked the clutch seized.