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. My '86 Chevy MonteCarlo LS was like that, shifted at only 4000, although stock engine pulled well to 5,000 plus... stop at a stop sign, start up and round a corner and it was already in 2nd gear... MonteSS auto shifted at 5500, but had bigger cam and heavier valve springs... My '78 F150 doesn't have a tach. so I'm not sure what RPMs it's turning, was wondering what the WOT shift RPMs was, prolly 4000, as well... I have a tach here to put in it, but don't know if it works...
. I'm not that familiar with C6's... had the truck a long time... had the C6 rebuilt a long time ago... but only discovered a year or so ago that they have a vacuum modulator like a GM TH350... I thought they used a kickdown/upshift linkage... wasn't sure if an adjustable modulator or different governor springs (or both) were the way to change shift points...
I think it's a head gasket. It blew coolant out from under the head as well as out the exhaust. She started getting warm. But it was still running ok at first. Started Mis firing a bit later.