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740 shifts weird 700

Have a '90 740 B230 that started engaging harshly in Drive but not so much reverse. After checking the throttle pressure cable adjustment about three times, I took the valve body down, replaced the accumulator piston o-rings, and replaced the valve body gaskets and check balls (some are plastic). I found some wear on the separator plate between two holes that restrict pressure under certain conditions. I put it all back together and it was smoother for about two minutes. I wish I had used Mobil synthetic ATF but I added BG Products trans conditioner (was not previously a believer in additives). After a little while it made a difference. Some say synthetic makes a huge difference. Did not solve the problem completely but it improved greatly. Would love to be able to buy a new separator plate and selector piston just to try, but the hesitation engaging Drive is almost gone and the harshness is at acceptable level. And I have no idea where to get new valve body parts. Got used one from junker but it was corroded and plates were etched and unusable. The cheap way is to change the fluid by one way or the other and try either synthetic fluid($5 qt.) or use the additive.






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