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Message: [QUOTE="Charles, post: 253988, member: 103"] Maybe my old DPC421 PCM's have a thicker board or something, but on my 550 and my truck, it takes [i]considerable[/i] force to push the chip home, and considerable force AND wiggling back and forth at the same time to remove it from the PCM board once installed. If I had a fish scale I could check it and probably shock some people. I usually take off the slimy looking crap from the PCB until I [i]think[/i] I have it all off the contacts and try the chip. If it doesn't work, I rub a little more off until it works. Absolutely none more than required to get contact. In my experience this makes the chip fit VERY tightly. Maybe something else is 4 position vs 6. I've never run a 6 position. [/QUOTE]

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