TH350 Leak Advice
#1
TH350 Leak Advice
I’m in no way an expert on transmission so would like some advice. Been tackling leaks in my TH350 on my ‘70 Cutlass Supreme for a while. To date, I’ve replaced the shift shaft seal, speedo housing and driven gear, tail shaft seal/bushing, dipstick tube and kickdown cable. Recently replaced the filter and pan with a cast aluminum pan and a thick Moroso gasket. All seemed good for a bit but then noticed a bit of fluid at the torque cover. I pulled the cover and there is some wet spots just above the pan gasket and appears to be coming from front pump seal. Trying to add some pics for reference but does it look like I’ve narrowed it down to the right component? The bottom pump bolts are wet and looks like the fluid is then traveling over that lip to the edge of the pan and wicking to the right and left along the gasket.
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