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british_atlantic 06-27-2022 10:56 AM

'87 Next Step in Shifting Issue Diagnostics
One of my SDLs has recently developed a shifting issue wherein (assuming it is starting in second) it will hard shift from 2nd-3rd around 3500 rpm (enough to chirp the tyres) and won't get into 4th. It will downshift from 3rd to 2nd on decel just fine. Still goes into R/N/D with no hesitation and it happened suddenly so it seemed to be a kickdown issue. Went ahead and swapped in a junkyard solenoid and switch to no avail. Just got back under and unplugged the solenoid, again, no change.

The issue developed after my first drive post aircon service and fluid top off. Drove 100% normally to the store to replace the freon I had used and then after starting and driving out of the parking lot, the issue was present. I don't hear any sort of unusual noise from the gearbox and the fluid that came out when I replaced the lockdown solenoid was free of metal flake, did not smell burned, and was a fresh red color. Fluid level is correct, no overfilling. I checked the vacuum line coming from the transducer and connections feel tight, perhaps there is something else in this region that I might have bumped during my aircon service?

I've done a fair bit of searching on this and other forums and all signs seemed to point towards kickdown. I imagine the next step is to do a fluid/filter change but was just curious if anyone had any other sort of insight. I have a spare vacuum modulator valve but I am still unclear as to what symptoms it produces upon failure.
Thanks all in advance for any advice!

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