C6 modulator pin missing

You have burned out the reverse clutch pack most likely, time for a rebuild.

I do not know what year this is but a C^ is not an "E" series so it is a strictly hydraulically controlled transmission, I would say you need to rebuild it.

I would not use any one that has a transmission control module unless yours already has one. They do make TCMs aftermarket but you have to wire everything in and make sure its compatable for your application.

Check the fan on the radiator. They may have missed plugging it back in.

check vacuum line to modulator valve

Hi,

Your transmission does not give the greatest service in the world. it is a GM design and they were prone to have internal problems. There has also been a couple of software updates that Volvo has put out since your vehicle was manufactured. It would be my recommendation to have the transmission properly serviced, (to make sure we have the correct fluid level and condition) and to be sure we had the latest software installed in the Transmission Control Module before we condemn the transmission.They usually do not repair the transmission. They replace it and would cost you around $2500. If it doesn't help, you may consider Aamco transmissions for this repair. They are experienced in rebuilding vs. replacing your existing unit and that may be more economical than replacing the unit. They will also give a 12/12 warranty on their work.

Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Transmisson is toast

Tighten the band adjustment to 18 inch pounds it is a stud with a locking nut on the side of the transmission it is the one located toward the rear of the transmission not the one towards the front that is the 1st/reverse band adjust replace the modulator if problem persists sometimes they stick

I would the oil level in the tranny.mabee from sitting some leaked out.But i would add the Lucas as soon as i could.

Time for a rebuild, or used trans.