Re: Axle swap question
I believe the spring perches are the same on the 1/2 tons. If you get up to 1 tons, they may be different. You also need to verify the u-joint is the same, as well as the shock mounts.
As an FYI, I put a "same era" 8-lug SF axle under my 1/2 Blazer. Bolted right up and I was also able to use the e-brake on the new axle. I did have to upgrade my u-joint though. There is usually a conversion u-joint if needed.
If you were closer I'd have a 3.73 axle for you.....
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- Jeff
89' K5 Blazer, 2.5" lift, 35" tires 
04' GMC Yukon XL, 3/4 ton, 8.1L
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