Re: Has anyone used later backing plates ?
the solid backing plates will work fine, i switch to the solid ones on all my trucks. i switch to 73 on up spindles and axle shafts too--makes it easier to buy replacement parts later on and the newer axle shafts are more heavy duty. the front axle in my 72 super is out of a 71 1/2 ton that was ordered with posi front and rear (i still have the original build sheet to prove it), i swapped everything from a newer 44 3/4 ton with no problems whatsoever. i did the same swap on my 72 cheyenne too. one word of caution when swapping complete front axles--there is also a dana 44 h.d. with 3 inch axle tubes instead of 2 3/4 inch, if you get one of those, you'll need the u-bolt plates for the bigger housing--i learned this one the hard way 
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jerry moss
72 cheyenne super K20- tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,tow hooks,bumper guards,toolbox,aux. fuel tank,posi front and rear,plus other goodies!!! SOLD
69 suburban K20-tilt,tach,vacuum,speedwarning,buckets,shoulder belts,am/fm,4 inch all spring lift,4 speed, 14 bolt full floater, dana 44 HD,warn winch,posi front and rear,tow hooks,plus other goodies.
73/80 chevy/gmc K20 SB400,turbo 400,205,tilt,a-c,gas hog.
77 K/5 cheyenne blazer-daily driver/beater. SON HAS IT NOW
BRENTWOOD,CALIFORNIA
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