code P1740 on 2000 Dodge Ram Van 3500

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does anyone know hoe to diagnose this code P1740 on a DodgeRam Van 3500. when im driving it the gears shift a litte hard.
(1) Answer
its a 3-4 shift solenoid circuit failure.

you need a scan tool, volt meter and a shop that can trace down the issue. these diags are not for home repairs as most people dont have scan tools at home.
a trans shop can diag it for you and give you a bid. the 3-4 solenoid may be the failure but you must verify the wiring harness too.