Posted by The tractor vet on May 23, 2017 at 09:32:01 from (104.179.81.68):
In Reply to: Auto trans oil temp posted by bumblebee on May 23, 2017 at 07:46:19:
Many years back i bought a sun kissed lemon and it ate transmissions like M & M's till i found the problem with it . after Ford refused to fix the transmission when the fifth one failed i got into it and made some old school changes and beefed it up . At that time i installed two pressure gauges to keep and eye on trans pressure and trans temp . The truck here in question was a 1978 Ford F250 4X4 Snow Patrol pkg. truck and was Suppose to as heavy built as you could get . That truck was a Lemon from the get go as the night i bought it it never made it home and had to be towed back to the dealer . But anyway after having all i could stand of the 400 M engine and the C6 that came with it from the factory we up graded the truck barn yard stile . The ft end came off and a hand built 385 block went in and the factory pieces and parts in the C 6 got changed out . what i found was that the front clutch pac only had three disc's and three plates when it should have had four plates and disc. It got a total clutch pac. replacement and up grade with parts i had been hoarding . Valve body was gone thru and improved pressures were set a little higher shifting was enhanced a bigger secondary cooler installed along with and engine oil cooler and the gauges , GOOD gauges as i installed Stewart and Warner gauges (you could still get GOOD gauges back then.) Well here is what i found on trans temps . Now this was when the speed limits were double nickel and at 55 or close to 55 with no load on a warm summer day i would have about 180 degrees on the gauge , Now this was with a 4.10 geared truck , Now you start pushing the truck and your luck of not meeting new people and push it on up to 65 with no load depending on mother nature and head wind you could see temps on the trans run on up to 225 degrees . Now this was with the deeper sump pan and with the larger external cooler that added a gallon more fluid capacity . Now i never did pull a trailer with this truck so i do not know how she would have done doing so , but while snow plowing and working her she would hit the 240-250 mark . Now while plowing snow the truck was weighted with a ton in the bed and ran on 12x16.5 tires . The engine was a 460 built to 1969 spec.'s built with all ford parts to a stock 11to 1 compression . It ran great and i ran that truck for five years with out a lick of problems before anything happened to it , But with snow plowing the forward clutch pac takes a beating and it failed after the fifth year , nothing wrong with the lining of the disc's the teeth get wore off and no teeth no go . Now on the new trucks they have idiots lights that come on when the trans . gets hot now as to where the factory sets the censor ??? who knows . But ya get the fluid to hot it starts to break down and i think and here again i think someone told me 320-340.
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