2003 ranger 4.0 180,000 mi., trans replaced at 130,000 mi
I too am getting P0715 code with flashing O/D light and slipping/harsh shifts. Why oh why did they put the TSS inside? $30 part now cost $1000 to replace.
If bang shift won't hurt the trans is it OK to continue driving the truck as is? Will this eventually become damaged beyond repair?
RE: Bite the bullet and fix it now?
Best to totally rebuild trans or is it OK just to replace the internal Turbine Speed Sensor? OR just swap trans with a used one and hope for the best?
What do you all think?

I am getting too old to roll around under my truck wrestling transmissions.

 

You have 50,000 miles on your "new" trans. How long has it been banging?

 

wasn'r brand new, was used and yes replaced ar 130K
started clunk about a week ago and took to shop for flush/service
mechanic said fluid was clean with no metal shavings

 

my bro accidently added a pint of CVT fluid awhile ago, do you think that would cause any problem?

 

How long ago was "a while"?
If it was about a week ago.....I'd be thinking pump-out via a disconnected cooling line.
A poured pint might be 5% of the transmission's total capacity.
I don't know if that's enough to matter, but selecting incorrect fluids can have bad outcomes.

Warming it up and doing a transmission line pump-out is an effective and affordable first attempt.

 

The CVT fluid was added 2 months ago, the P0715 just showed up a week ago and had the flush done 3 days ago