Hey guys I desperately need some help. My stock 68 burnt up at 108000 miles. I ordered an ATS stage 2 trans. The install went well but the trans shifted odd. Over the past 4 weeks the problems have got worse. The 4 to 5 upshift is very awkward when shifting the truck revs up 500 rpm or so an simultaneously feels like the truck is slowing down. It finally shifts and heasitates before it locks up the converter. It does this every single time. It is much worse the more throttle it is given. Also in the last 2 weeks occasionally when shifting into 6th it feels like someone is jumping on the brake pedal hard enough to chirp the rear tires for a second then it lets go and most of the time makes it into 6th but sometimes stays in 5th the next time it tries it goes into 6th smoothly. It rarely throws codes which is very frustrating. The latest. Are a P0846 and a P1776. This is so frustrating. I've tried everything I can think of. Please help. I hope trans engineer sees this.
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