Its not stock but not a streetrod,the rattle was a shock bracket that was loose. About 5 years ago I went through the drivetrain and suspension and did not tighten the bracket,I first thought it was the springs making the noise since I did not put the clamps back on after installing teflon between the leaves.
Guess your 37 is stock.My 38 was my 37 is not stock at all in drive line.Was your rattle a leaf spring?Took two out in front of the 37 to lower it and a rattle went away in the late 70s I had.37 is first year for 216 I think?
