87 300E Shifting Problem Need Help/Advice
 

Hey All,

My 722 trans is acting up. It doesn't want to shift into 4th gear.
I was heading out on the freeway and it just wouldn't shift into 4th. Drove about 40mph @ 4000rpm to get off the freeway. It wouldn't shift manually either. Full throttle or not. When I unhooked the vacuum modulator line, plugged it and went for a drive, it shifted through all gears fine. Just shifted too firmly. So, does this sound like the modulator is bad or needs adjusting? Any help would be greatly appreciated.

Thanks

Sounds to me like your kick down switch is stuck.

>Sounds to me like your kick down switch is stuck.

Is this switch at the throttle linkage or the gas pedal?

Beneath the pedal.

Bowden cable
 

Hi,

I had a similar problem with my bowden cable. I sort of bent it while removing my oil filter. The car would shift, but at a higher RPM. I straightened the cable and put a few drops of ATF through the sleeve and most of the linkages. That solved my problem.

BOWDEN CABLE: It's the cable running from your tranny to the throttle linkage. It's right next to or even touching the oil filter. Remove your air filter assembly and it'll be obvious.

cheers,

Okay. I will try unhooking the switch to see if it works. My linkage is lubed and adjusted.

I noticed that the plastic housing for my kickdown solenoid is cracked all the way around and barely wet from trans fluid. Do you think I may need to replace the solenoid? Or is that just cosmetic?

Thanks again

The cracked leaking kick down solenoid is probably the cause of your shifting problem. It’s part of the governor circuit; you are dropping governor pressure. Remove the wire and use an 18mm wrench to UN bolt the solenoid it is easy to change.

http://www.peachparts.com/shopforum/showthread.php?threadid=91137