I think this may have been the case but maybe because of noise too. Could be because it's my car I'm more critical of it but some other Ford and GM sedans of the time seem a little less noisy under acceleration. Like I said could just be me, but it would be cheaper to attenuate the noise by changing acceleration vs adding insulation. Look at the 42LE, Chrysler doens't mind being too cheap in some areas.JE.Electronics said:I think stock gearing was configured to keep RPMs low. Improved MPG?