Those spline counts are for the 80s and up trucks. I don't have the info for the 70s trucks - thus my question. Maybe they're the same, but I don't know for sure. In the 70s, GM did things different. Many of my 70s Blazers have the HD cast-iron 205 transfercases - and in the 80s those cases were only used in HD applications. Often in 1 ton trucks. I've got a 79 Blazer here with the 205 transfercase and a 305 engine - along with the four speed top-loader HD trans.
With this 78 - I know the linkage isn't the problem. I know it's internal - but have not peaked inside yet. To tell you the truth - I bought the truck last year just to get the camper off of it. A local girl drove it here to NY from Colorado and it had an odd-ball Hallmark pop-up camper on it - specially made for K5 Blazers. So, I used the camper on one of my diesel Blazers - and then stuck a plow on this 78. Put chains on all four wheels and was just keeping it for the worst conditions. First time I used it, it plowed OK but things weren't too icy and snow wasn't real deep. 2nd time I went to use it, I discovered it didn't even have 4WD. Not so easy to notice when you've got good chains until you hit some deep snow or get stuck in a snowbank and only see the back wheels turning. So, that's where I'm at. It's something internal - and if I put a lot of pressure on the shift-rod - it will work 4WD in high range, but not at all in low range.
I've never installed one of those conversion kits, but will assume they were not all of the same quality? Who knows, guess I'm going to find out.
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