Quote:
Originally Posted by Bigdav160
I was under the impression that all C/K 20's had dual diaphragm boosters even the 71-72 models
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I couldn't tell you for certain, but I do know that the brake booster I previously had installed was an 11 inch, single diaphragm booster as that is what comes up as the factory replacement for a '72 C20 at all of the major suppliers (Auto zone, Advanced, Oriley's, Rock Auto, Summit Racing, etc.) The dual diaphragm booster comes up as a factory replacement for the '73 and later trucks.
The mounting brackets on the dual diaphragm booster are not the same, which would point to it not being an OE application, but again, I honestly don't know. It will be interesting to see if there is any braking performance gained with the swap. For $145, I was willing to roll the dice.