Why does transmission grind only when putting in overdrive

Have you ever had the transmission serviced? No guarantee, but I bet it will operate fine if you have the filter and fluid changed.

yes sounds like the valve body is sticking and possibly a shift solenoid

Not good if it makes a grinding noise. Needs a tech or replacement as something most likely has come loose inside the transmission.

you will need the ****** rebuilt to fix that problem.. sounds like truck was driven in town with the overdrive on.. overdrive is for highway use only any in town driving in that gear will destroy it...

If you know a mechanic now's the time to cal. The part is internal but might be replaceable without removing the tranny.l

The sun-shell in the transmission has cracked if you do not have reverse, and are in a low gear range with no overdrive. As for the grinding, that is the remnants of the sun-shell.

Hey Cody,
Sounds like its time for a transmission filter and fluid change.. and BEWARE - If the transmission has not been serviced on a regular schedule you may not be able to drive away from the service shop..(THIS IS NORMAL for a GM transmission that has not been serviced regularly -- I have had this happen to myself once on a '96 suburban!!) If you need to get the trans rebuilt ..TIP - go to the local drag strip and ask several of the mechanics who the best transmission man in town is..(THEY KNOW!!)..use him!! It can usually be rebuilt for around $1400.. Good luck!!!

The torque converter lock up solonoid is bad. This is an internal transmission part that requires partial transmission disassembly. Most times its cheaper to put a good used transmission in.

I believe we call that a planetary gear, found in the rear of the transmission. Its gone.