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Old 11-05-2007, 09:05 AM   #1
Old Chevy Mech
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Question 3/4 ton front driveshaft

I was wondering if the drive shaft on a 1970 C/20 4x4 is suppose to be the small as the one on the Blazer. My 3/4 ton front driveshaft has only 2 U-joints unlike my Blazer which has 3, 2 in that CV style joint. Any knowledge would be appreciated. Reason I am asking is, I just bought the truck and have discovered a few re-engineered items that make me question things that look suspicious, and the welds on the front drive shaft don’t look like what I am use to seeing on 1970 trucks.

Frank
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Old 11-05-2007, 09:19 AM   #2
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Re: 3/4 ton front driveshaft

My 69 K20 didn't have a cv joint on it's front driveshaft and I'm positive it was the stock one. Don't know about the one on my 70 K5 as it was gone when I bought the vehicle. Both trucks currently are using cv joint front driveshafts.
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Old 11-05-2007, 12:06 PM   #3
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Re: 3/4 ton front driveshaft

I have 3 u-joints on my 1970 k20 front drive shaft. I'm pretty sure they are original, at least they still have spicer u-joints in there, got them all cleaned up and I see spicer stamped into all the bearing cups.
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Old 11-05-2007, 12:23 PM   #4
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Re: 3/4 ton front driveshaft

Do you have any pics of the front driveshaft you are talking about?
If you can see anything in the pic..this is what a stock front driveshaft looks like.At the t-case end,there are 2 u joints,and another at the axle end.Maybe there is a newer driveshaft on your truck?
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Old 11-05-2007, 05:36 PM   #5
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Re: 3/4 ton front driveshaft

Quote:
Originally Posted by 1969k10stepside View Post
Do you have any pics of the front driveshaft you are talking about?
If you can see anything in the pic..this is what a stock front driveshaft looks like.At the t-case end,there are 2 u joints,and another at the axle end.Maybe there is a newer driveshaft on your truck?
Attachment 312117
Thats like the one on my 70 Blazer, the one on the K/20 Pick up only has one U-joint on each end, basically just a smaller shorter & smaller version of the rear drive shaft.

Frank
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Old 11-06-2007, 09:59 AM   #6
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Re: 3/4 ton front driveshaft

I'm 99% sure 1970's had the cv joint. When I converted my 1970 2x4 to 4x4, I lengthened the 1971 front driveshaft that I used and removed the cv joint. Unless it's being used with full time 4x4, it's not needed.
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