May have to explain the problem a little further. Is the overdrive not engaging? At what speeds/ conditions is it happening?


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yes it did engage corectly.i was driving at a regular speed on a contry road here and sudently it lost,desengage the Over drive.i left the feet on the trottle and push it back and the over drive re engaged .

i heard about a fact that a problem on the second catalytic converter,the one near the transmission could affect the transmission shifting when the cat become ,,,,a clogged catalyst it become so hot and it is near the transmission it will effect the gouvernor ???

have you heard of that???

my engine is running good,spark plug are GM and new,my truck is well maintain in order.

thanks
gervais

 

Are you sure this is not a case of it just needs to shift because the load condition as changed?

If you are convinced it is shifting by itself with no apparent reason I'd suggest finding a reputable transmission shop so they can do a test drive. Something internally may be beginning to fail.

I'm the furthest from a transmission expert, but if a transmission shifts on it's own I'm pretty sure there is a problem.

If you have been driving the truck for a long time and you feel this is sudden and unusual then you probably know something is wrong/different.

 

well,also the transmission oil is new .i dont have any code reported.
it is bizarre.

now i would need some picture of how they connect an oil cooler on the line?
some have suggest me to install one ,1 or 2 times a year i am hauling some wood stove so it may getting hot a bit but we are not in Arizona here ,,,,

thanks
Gef

 

What size tires?

 

LT 31 inches ,i could not find locally the P265 that it add

 

If there is damage done already, a cooler won't fix that.

A wood stove is not too heavy for your truck to overhead.
Doesn't matter if the fluid was changed recently. Could still have internal damage.

Take it in for a test drive.

 

Transmission fluid level correct?

These transmissions will do some funny shifting if the fluid level is too low.

 

yes it is
castrol syntec but i dont remember the grade
i have one bottle in my garage if needed
gef

 

it should have been dexron iv, i know castrol makes it... let us know.