you made a score there Jay, that's a very nice looking truck, great color too - and yes, the 2 speed rear could have been 'special ordered' for it .... as far as holding 55mph for any length of time, don't count on it no matter what engine [even a small block], the problem is the rear gear ratios, and the 2 speed high won't really help, I believe it was about 6.17, the same as the regular 1.5T [the low ratio was 8 something] - the 1.5T 46 I had was pretty well maxed out at 50 unless it was downhill, with a "whole lotta shakin goin on"

Bill