I'm going to be putting my engine from my wrecked series 5 into a straight bodied series 4 and try to retain the automatic transmission. Do I need a series 5 counterweight for the automatic transmission, or can I use the counterweight and flexplate off of the series 4?
And are there any accessories that are necessary to the operation of the automatic transmission?

 

This might help:

http://www.rotaryresurrection.com/2n...o_s4_swap.html

 

So I'm going to assume that yes, I do need the series 5 counterweight and flexplate. I will try to obtain those. Thank you.

 

you need whatever the series engine is...it's the engine that needs Counterweight,NOT the trans.