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Old 01-12-2018, 01:46 PM   #35
Ski-me
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Join Date: May 2012
Location: Colo Springs, CO
Posts: 870
Re: Needed a diff, coming home with a 90 R20

I don't know about swapping the master cylinders, but I would guess no. I would get the correct one with the correct vehicle. With that said, I have my 14 SF in the rear of my 1/2 blazer and works just fine. But most of the braking is in the front anyways so not as important.

I don't know how to test, but I'd assume a multi-meter could tell you some info. Alternatively, you could find another DRAC unit in junkyard and see if anything gets fixed. If you have the ABS error and speedo error, then maybe a replacement would help. A good check and pretty cheap if you can find one. I want to say Astro vans also have usable DRAC units....but could be off on ratio's on speedo accuracy.

I got a used one, added some selectable switches, and now I can dial in my speedo spot on, with axle ratio, tire size, etc. Works great!

Where there is a "red switch box" use to just have a straight piece of wire (or two) for vehicle specific axle ratio and tire size from factory.
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89' K5 Blazer, 2.5" lift, 35" tires
04' GMC Yukon XL, 3/4 ton, 8.1L
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