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The one on the truck looks like it's original and has the "adjustment" on the end - like this one listed on ebay: https://www.ebay.com/itm/155285703936 What effect will adjusting this have? Should I tighten or loosen it? The bulk of my transmission experience is 700R4's and 4L60/80E's so...

Thanks for the tips! The modulator on the transmission looks to have a small threaded grub screw in the end of it - is that the adjustable unit? This truck has only 8k miles on it but seems to have been messed with by complete idiots that couldn't get it to run or drive correctly so they have...

I got this M1009 unit running and first drive - no shift out of 1st gear. Got 20" of vacuum from the pump. Nothing from the regulator valve. I took it apart and cleaned it up - did get it to function at least a little bit by unscrewing the top to put more tension on the spring inside. Got it...