Automatic trans

I have a1993 B220o Automatic, I have had it for 4 years, it always has been reluctant to downshift when you get on it.
It seems to shift early, and won't downshift much, unless you are going very slow.
Only way to downshift is to manually do it with the shifter.
All seems mostly normal, I just always found this odd.
Anyone have an auto that is similar?

Thanks

Because the overdrive is electric it should come out of 4th and into third very quickly.The other gears operate by vacuum and fluid pressure in the tranny.Since 2200s that are carbed (u didnt say if ur's was FI ot carbed) are notorious for vacuum leaks I would check for one of those first.Dropping the tranny pan,cleaning the screen ,replacing the filter and going to synthetic tranny fluid might help.My 92 2200 with carb and AT shifts down about as fast as it upshifts.You can actually adjust the shift points on the AT via a small screw on the vacuum modulator on the side of the AT.Screw in to raise shift points,out to lower them.BJ

Thanks for the info, my truck is a 93, FI.
Mine just basically will not downshift on its own, anything over 50mph and it locked up in OD and won't come out unless I click the button.

In the other gears it won't either.
Also if I just nail it form a stop, it shifts up VERY early, will not rev out before it shifts.

might be telling you FIX ME hehe sounds like a clogged valve body.

Yeah,Slammed may have hit it.I would do a complete tranny service and switch to synthetic fluid and run it for awhile and see what happens.The synthetic may unclog the valve body if that is the issue.BJ

Can you guys tell me more on what the adjustment actually does?
What exactly controls this tranny vacume wise?

Vacuum line from the intake to the vacuum solenoid on side of the tranny.As u accelerate,applies more vacuum to the solenoid which builds more pressure which causes the tranny to shift.The screw adjustment on the side raises the pressure required to shift,thus raising the engine rpm level required to build that much more pressure.Sabe'?

Sounds good, but how does it deal with load?
If you use more throttle, there will be more vacume, but not in all cases more rpm..
I will try and play with the pressure and see what affects what.