got a weird issue going with my o/d tranny in my ranger, This has happened twice, I left work, started down highway and the engine gets going but tranny wont upshift???? anyone got something here?

 

Assume automatic

What year?
and what trans model?

4R70W was Explorer V8 trans

Pretty much all 1995 and up Ford automatics were full electronic shift, so computer grounded solenoids in the transmission to shift between the 4 forward "gears".
Computer watched speed, RPMs and throttle position to select what "gear" to use.

Like all automatics it runs on fluid pressure, servos/solenoids open and close valves to send that pressure to specific points to engage "gears".
So you could have a solenoid failing or valve sticking.

Some OBD2 readers can read transmission codes, and some transmission shops will read the codes for free, that could ID a failing solenoid.

You can change solenoids and valve body with trans in the vehicle, not "easy" but certainly a DIY job

 

Tranny is 70rw or what the auto o/d trans that comes on 97 mtr with 302....valve body shouldn't be too hard to do..thanks for input