Quote:
Originally Posted by Porterbuilt Street Rods
You will have to notch the following places:
Core support (so it can set over the frame that extra 3/4")
Cab at firewall to to floor pinch weld (really simple and not too involved)
Cab floor for trailing arm xmember (more involved not terribly difficult)
That's all the notching. 
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What part of the trailing arm cross member causes the interference? Is it the whole width of the x-member that you have to notch the floor or is it just the center section? Is there any design modification to the x-member that could be done to alleviate the interference?