380SE transmission slipping on 2nd 3rd gear change

I Have a 1982 380SE 126 series which slips on upshift between 2nd & 3rd gear. Is this a band adjustment or worn clutches or dirt in the control valve assy ?

On the same vehicle where is the idle control box ?

What causes the idle to periodically surge when the vehicle is hot ?

Best regards,
Gary Hogg

[acerejo]

It could be a modulator problem, I suggest searching for modulator subjects, there are excellent posts in the data base.

Armind

[joe p]

There is a updated K2 accumulator kit for that that is a decent bandaid. Keep the old one, you'll want it when you rebuild. Or you can cut straight to the core and overhaul it.


Joe