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

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all of the sudden slips in od only. all other gears work fine

was driving my 92 vette on the highway for 3 hours and then stopped for about a half hour. Got back in car started it , put it in od and took off. car moved at first but then started slipping so bad it almost quit moving. put gear shift in third and it took right off.

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@fun24ever , David, You will want to check the transmission fluid level right away and top up if required. Check for trouble codes to aid in diagnosing the transmissions problem, some parts supplier offer free code reading like Nappa, Pepboys, Advanced auto,etc. Is your trans. fluid dark,dirty or have a burnt smell. There are a few things that can cause a transmission to slip dirty contaminated trans fluid, plugged filter, pinched transmission line, plugged passages in valve body of trans, worn clutches, weak pump, Throatall Valve (TV)cable damaged out of adjustment, etc.. Best to have a good transmission Tech. have a look, diagnose and estimate repair. See links below for more info/troubleshooting. Good luck.

I hope this helped you out, if so let me know by pressing the helpful button.

http://etereman.com/blog/general-motors-...

https://www.trnw.net/z-search/700R4.php

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