This morning on the way to work I noticed my '86 auto brick wouldn't shift into 4th gear. Thank goodness it was a slow traffic morning on the freeway, so I was able to comfortably drive under 50 mph. Anyway, a couple of years ago, I had the same problem and found the white wire coming off the top of the OD solenoid was brittle and shorting on the frame, so I taped it up as far to the solenoid as I could reach and also bypassed the OD relay. It's worked perfectly until this morning. I had replaced the transmission linkage shifter bushings on Saturday, but don't think I was near the wire which sits higher than I was working plus I drove it yesterday and all was well. This evening if there's enough light when I get home, I'll take a quick look at it, but if it is the actual OD solenoid, how difficult is it to get off and back on. I thought I read somewhere that it takes a special tool to get to. I'm not looking forward to this project if that's what it is.

Oh, and I turned over 343K miles this morning too.....

Thanks.
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'86 sedan with 343K miles with original engine and automatic transmission