1993 isuzu mu ucs55 30-80 automatic service manual?

[killpro4]

just wondering if there is a service manual for the automatic gearbox on my Isuzu mu. trying to see if I can adjust the gearbox to make it drive like normal again (sometimes doesn't know what gear to choose/holds too high of a gear going up hill and doesn't down shift)

[geeves]

on the side of your injector pump there is a plastic disc looking thing with 3 wires and held by 2 screws. Mark its current alignment then twist it very slightly one way or the other. One way will improve it but dont move it much.