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I recently did this job on my 84 Cab. This sensor apparently has a tendency to seize. After applying some relatively modest force and liberal amounts of PB Blaster (which is a must for this job, IMHO), I was able to unscrew mine all the way out. However, in the process, the threads were toast (I suspect your threads are now in the same condition). You will not, I suspect, simply be able to screw in the new sensor. You will probably need to re-tap the threads, which is what I had to do. I believe that there are some postings on this forum about how to do that. I don't remember what size tap I used, but again that info should be available somewhere on here. This was one of the first projects I took on when I got the car, and it was not as easy as it first appeared.
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