Your guy is right on the money. I spend my days at a GM dealer building transmissions. I take it you have a 4L80E cause P0730 is not code that can set for a 4L60E.
P0730 is a gear ratio code.
P1810 is a fault with the manual position switch or a false code due to another concern in the trans.
� DTC P1810 can set from low pump pressure, a stuck pressure regulator, or unit refill from overhaul and pan removal.
� DTC P1810 can be set by a slipping forward clutch, allowing a 2.08:1 ratio, reverse, when the manual valve position is indicated as D4.
� DTC P1810 defaults to an elevated line pressure condition which may result in partial TCC apply. This may produce an idle surge that could stall the engine.
I see a lot of foward clutch packs slipping or direct clutches burnt up.
your issue is common for the forward clutch. Direct clutch issue usually shows up with NO reverse.
Most common fault of the 4L80E is the torque converter failing and causing a 150 to 300 RPM slip and DTC"s to set. Just a converter is needed for that type of failure if the unit is a low mileage trans.
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