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Old 08-29-2012, 07:40 PM
Gen1dak Gen1dak is offline
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Converter drainback sounds right to me as well. There's a ball-type checkvalve in the transmission return line. It's bad about corroding and restricting transmission fluid. It was put there in from the mid-90's to help prevent converter drainback, however when they corrode shut, they fry transmissions, and if they stick open you get drainback (trans service may have shaken some speck of debris loose and jammed the valve).
Try this. Next time you start up (cold start after sitting overnight), put into neutral immediately after starting, for about 5 seconds. Then put in Reverse or Drive, doesn't matter. If it engages normally, converter drainback is the problem (converter charges in R, N, or D, D1, D2, not in Park). If so, at least get that anti-drainback valve replaced. Me, I'd remove the valve and fix the problem with an aftermarket valvebody shift kit from Superior, Fairbanks, or TransGo. These kits allow the torque converter to charge in Park as well and as a side benefit, you can check the fluid level in Park instead of Neutral (much safer).
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