07 F-150 trans fault
Truck in sig picture, 5.4 liter, 4spd, 4:10 rear. I know I'm towing at max CGWR of 15,300 or better, but this "trans fault" has been coming on with more regularity in the last two years. This weekend ...
Forum Discussion
Personally think 250*F is too high and note that, that is the temp where it is
measured. Typically at the test port, but not the hottest point and that is at
the tips of the TC vanes where the shearing occurs...your fluid was hotter
More so if that temp was measured at the sump/pan...it is WAY hotter inside
the tranny
Personal, as many advisors here say: "it is good for it", "designed for it", etc
I'm not one of them and think keeping ATF as cool as possible while high enough
to vaporize condensation. This also provides lots of head room for those difficult
climbs
High temps will NOT cause instant failure, but will sooner than later
Sustained high temps has a greater potential of creating nasties in the ATF and
will coat (mainly varnish) precision mating parts...breaking down the AFT, etc
Why the OEM's invented the TC lockup. To remove shearing of ATF when
no torque multiplication needed, or slippage for gear change
I'd love to hear how this works out and hope it is just as others said...a
faulty something or other
measured. Typically at the test port, but not the hottest point and that is at
the tips of the TC vanes where the shearing occurs...your fluid was hotter
More so if that temp was measured at the sump/pan...it is WAY hotter inside
the tranny
Personal, as many advisors here say: "it is good for it", "designed for it", etc
I'm not one of them and think keeping ATF as cool as possible while high enough
to vaporize condensation. This also provides lots of head room for those difficult
climbs
High temps will NOT cause instant failure, but will sooner than later
Sustained high temps has a greater potential of creating nasties in the ATF and
will coat (mainly varnish) precision mating parts...breaking down the AFT, etc
Why the OEM's invented the TC lockup. To remove shearing of ATF when
no torque multiplication needed, or slippage for gear change
I'd love to hear how this works out and hope it is just as others said...a
faulty something or other
