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69 K5 LS 6.0 [Deleted]

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Did you check the angle at the transfer case and compare it to the angle at the axle? Is the 20* the angle that the tube is at?
 
After cutting the shaft down & welding it yesterday, I went down into town today & got a u-joint installed & the shaft bolted it in.

I measured a neg 5° at the transfer case and a positive 11° at the axle yoke. I think I’ll cut the tack welds on the spring pads & raise the pinion a bit higher on the axle tomorrow.

A0A714E1-4D84-476A-9AE6-629C39FBD385.jpeg

A8B204C4-7E81-481B-AC08-5D540C82F949.jpeg
 
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You are going to raise the pinion?
With a 2 joint shaft, you would need to lower the pinion. It should match the T-case angle under power. This would be +5 while accelerating.
However, if your shaft was at 20* and you have -5 at the case, then you are at 15* operating angle there. That may be more close to the limit at which that joint will run quietly. I can't tell you for sure.

I don't remember what the angles were on my old K5 chassis. It was close to needing a CV shaft.
 
6872xtc said:
You are going to raise the pinion?
With a 2 joint shaft, you would need to lower the pinion. It should match the T-case angle under power. This would be +5 while accelerating.
However, if your shaft was at 20* and you have -5 at the case, then you are at 15* operating angle there. That may be more close to the limit at which that joint will run quietly. I can't tell you for sure.

I don't remember what the angles were on my old K5 chassis. It was close to needing a CV shaft.
Click to expand...

x2. In that second picture, you need to lower the pinion.

or put a CV joint up at the transfer case and leave the pinion angle where it’s at.
 
6872xtc said:
You are going to raise the pinion?
With a 2 joint shaft, you would need to lower the pinion. It should match the T-case angle under power. This would be +5 while accelerating.
However, if your shaft was at 20* and you have -5 at the case, then you are at 15* operating angle there. That may be more close to the limit at which that joint will run quietly. I can't tell you for sure.

I don't remember what the angles were on my old K5 chassis. It was close to needing a CV shaft.
Click to expand...
The shaft is definitely the shortest shaft I’ve used. The good news is that the spring pads are only tacked on & I can move it around a little. Thanks for the input.
I actually didn’t believe I would have an angle issue with this lift. Replacement stock springs with a ORD shackle flip.
 
The shackle flip kicks the pinion up, so it doesn't have the proper angle with the spring pads at the stock angle. But you are in good shape since you don't have them fully welded yet.
 
I have the two easy ones installed... the rear are 14” travel 5125s...I’m thinking outside the frame rails to as close to the hub as I can get with 6” of rod showing on the bottom mount. I think I can get a 15° to 17° angle.

I’ll need to fab up something... thinking the Ford shock towers welded to a 1/4” plates then each 3 bolts through the frame. Maybe a back plate just for added measure

13E6D3C1-78BA-4F4D-93A1-FB1385EC19B4.jpeg
 
Got the angle of the driveline all worked out...

Thanks 6872xtc & bp71k5 for your help.

I ended up moving the axle back to the forward hole in the spring mounts & changing the angle to match the TC angle

image.jpg
 
Just measured for a new Aluminum radiator with fans because I’m not sure I like the fit of the 06 Silverado SS one that I have. After measuring it up, I pulled out the radiator from a ‘70 big block El Camino & it fits perfectly after relocating the bottom mounts 1/2” toward the engine.
Now I’m thinking I should just go with that.
Does anyone have a reason not to use it with the 6.0 LQ9? or just spend the $600 plus for the cooler Aluminum one?
 
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