Transmission Problems

[tbuck74]

A few days ago I was pulling away from the coffee stand and my explorer slammed into gear really hard and as I was driving down the road I noticed it wouldn't shift and I was going 35mph at about 3200rpm. When I manually shift it down into 2nd it drives just fine but I can only go so fast being in second gear. When its in drive it will shift to 3rd very hard but not until 4000rpm.

Any thoughts on what is wrong I dont know much about trannys. Any input is appreciated Thanks!

 

[FR-425]

Vacuum modulator.

Check the vacuum line first, if that checks out then the modulator is bad.

 

[tbuck74]

Thank you that makes sense. And yesterday I started hearing a whine kind of like a vaccum leak