I run my diesel through all the gears and lockup too. To be fair though the diesel converter is huge and it has a billet cover. The stock converter didn't last long before the clutch started slipping. CRT makes a full manual valve body with a trans brake and with or without lock up. Only the lock up is on a switch. 1, 2, 3 and 4 are full manual control.

"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.