transmission spark control switch

[daveinkirkland]

I have a 1990 F-350 with 351W. Computer code hits the transmission spark control switch. The truck has the EO4d..It does shift hard and it seems to not shift down appropriatly on the free way....Any thoughts or help would be appreciated....

 

[mikesheldon]

It must be jamed due to lack of fluid see that its supplied with sufficient quantity of fluid.Good Luck!!!