Why dont you just check and drain the transmission fluid? Draining the transmission is as easy as changing the oil on our trucks.. May not take away the codes but probably will help with the rough shifts. The bolt is on the bottom of the transmission. Once you got it all out, make sure you use a strong thread locker to keep the fluid from leaking out when you drive.
98' RR 4.6HSE
00'-02' painted OEM front bumper and dual exhaust, tinted signals all around, black suede interior accents, factory subwoofer swapped to a 15" JL Audio
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Bilstein Shocks and Eibach Spring conversion, RR Sport 20" Stormer Wheels
96' RR 4.0SE
Tinted signals all around, black suede interior accents, coil spring conversion
98' Volvo C70 HPT
PIAA headlights, clear corners & eyelids