v8 into gq

[gqpt89]

i have put a 5ltr into my patrol now the auto has stuffed up i was wondering if any body knows the difference between the origanal c2 t/converter and the c4 t/converter and why they must be changed from a c2 to a c4 converter 0or have not done something that i shud have for thje auto to work properly thanks

[Bulldozen]

I'm deff no expert but maybe it's something to do with the v8 having a different flex plate ? And might be a bit stinger considering the extra power??