Thread: 700r4 shifting

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BRT commented that the shop replaced the valve. Makes me think that they either missed contamination in that passage or he has a servo problem. If clutch packs are clearanced (and they need to be a touch loose), then the band apply servo is not getting proper pressure from something like a broken ring seal or sticking piston or gunk in the bore. The way he describes the warm up, shut down and restart, it is possibly warm enough to free the piston from sticking during it's travel in the bore. Another could be 1-2 shift shuttle valve is hung up from galling or debris. Warmth and fluid loading in the channel makes it return to normal. It's hard not being hands on to see it first hand. 700R4 needs proper band apply for 2nd gear. I worry that it is slipping until it gets enough pressure to grab and hold. Keep your attention on fluid for a burned smell. The quicker this is resolved, the better that band is gonna like it. Good luck BRT.