Over the last couple of weeks my overdrive has become more and more sluggish (up to 20 seconds) when engaging to the point that today, it never did engage all the way to work (about 20 miles). Any suggestions?
Going by the fact that you said it slowly faded out, I would rule out an electricial problem for now. You should check the oil level in the transmission. Remove the plug on the side and oil should be level with the opening. Volvo says to use 30W but Irv uses the standard 90W gear lube. If thats OK the seals on the OD probably need replacing. <p>By the way, does your gearshift buzz around 3000 RPM?
Try <A HREF="http://www.spitbits.com/mk1/1147overdrive.htm" TARGET="_blank">http://www.spitbits.com/mk1/1147overdrive.htm</A> and other British car part supliers as they used the 'D' overdrive also. I'm assuming you still have a 'D' and it wasn't changed.
I have a "d" drive, correct. I put about a quart into the tranny last night. it was low. Now the OD works but was sluggish to engage this morning. All of this seems strange to me. Maybe I should switch to 90W but the 30W has always worked well so I don't know.
Changing the oil viscosity won't change the pressure that makes the thing work, in any case.<p>The problem isn't necessarily internal to the OD. On a D-type, look under the rubber boot on the solenoid and eventually you'll get to a set of breaker points. Give those a cleaning. Reflow any suspect solder connections.