Gregg,
Once again, the problem is the freight from US to Finland.
Therefore a complete axel assy is out of the question (too big, too heavy => way too expensive)
I already do got quite tall tires, however, does not help enough.
My D24 rear end ratio is 4.1:1.
My conclusion was, that the next easiest & least expensive step would be changing pinion & ring gear (easier & less expensive compared to overdrive)
I may be wrong...?
Original 40's-50's Mopar overdrive units are getting rare & expensive.
I recall seeing some of you guys using some modern GM OD unit.
How extensive modification involved there?
Prices and availability of the required components?