Mark Vieth
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I have a 91 R2500 Suburban 4L80E transmission, I changed fluid and filter. The filter kit had a very soft pan gasket that was folded up to fit in the box. Steam cleaned the pan, cleaned the transmission seal surfaces, installed filter and gasket, TORQUED, filled and drove 12 miles. All is well. 10 minutes later fluid is draining out due to a bulged gasket. Purchase new gasket in flat box and install, fill with fluid, started vehicle, place in gear. NOTHING???