The TH (turbo-hydramatic) 700R4 was developed for use after 1982 in GMC and Chevrolet cars and trucks.

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Why do I not have reverse when I have other gears?

700R4 or 350 turbo transmission

At first I started losing reverse and O/D gears, so I started driving in 2, 1 gears then I lost them. I was then told it was due to lack of tranny fluid cuz I had a worn out rear seal gasket. So i replaced that and put my drive shaft back in and it looked as if it was not in all the way but I had all my gears back except for reverse. I even put Lucas stop slip fix and I still dont have reverse, am I doing something wrong or what, cuz I don't know?

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Check your fluid levels the first gear to go when you dont have fluid is reverse followed by 3rd . If all is good there then youve done damage to the valve body by running it when you had no fluid

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Remember when checking fluid to have the motor warmed up and running while checking

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