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Old 01-11-2018, 12:27 PM   #29
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

The 89' will be cable driven speedo. 90 and 91 are the electronic speedos....you can tell the electronic ones as they have extra tick marks for the numeric speeds.

But, you can convert the 89' to electric with some work. Just not a lot of usable parts going the other way. I took the tailshaft off a 90-91 tcase, the pickup sprocket and installed on my 89 tcase. Then ran wires up to dash, repined cluster and done.
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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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