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Old 09-26-2012, 03:58 PM   #1
trymes
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Join Date: Apr 2011
Location: Southern NH
Posts: 21
Retrofit '88-'94 RWAL Rear ABS to a '72 C/20?

OK, so I have done some searching here and elsewhere on the web, and this topic has come up a few times, but there seems to be nothing too definitive. More often, it devolves into a discussion between those who think ABS is "The best thing ever" and those who think "ABS is Crap".

Anyhow, both my wife and I have had a few scares during panic stops. Both occurred on sections of two-lane while negotiating a corner. One was a deer in front of us, and one was a 10-wheel dumptruck. In both situations, the rear wheels locked and caused the tail to start swinging around. After that point, our brains caught up and we started modulating the pedal and making a mental note to keep a spare pair of shorts in the glovebox.

Both of us understand that you need to modulate the pedal to keep the tires from locking in a non-ABS car and that a properly operated non-ABS system can be as good as an ABS system. Having said that, when you combine the reality of a panic situation with the facts that we regularly drive ABS vehicles and that the truck is VERY light in the rear unless loaded (rare), it sure would be nice to have ABS (my opinion). For the record, the truck has a very nice set of Michelins on it that are less than a year old. Tires are not the problem.

Four-wheel ABS is better than rear-wheel for obvious reasons, and most of the dead-end threads I find focus on trying to install a four-wheel system. However, retrofitting a four-wheel ('95 and later) system would be FAR more work than retrofitting a RWAL rear-wheel only system. In addition, it will solve my biggest concern, which is the tail stepping out during a panic stop. If the truck stays in a straight line, I am happy to pump the pedal to keep the fronts from locking.

Considering that the '88-94 C/K Trucks came with Rear-wheel ABS and that the '67-'72 trucks are reasonably similar out back (at least for the leaf-spring models like mine), it seems that a retrofit ought to be reasonably easy to accomplish.

So, has anyone done this? Perhaps contemplated this? Any thoughts?

Tom
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