CK5
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New Here and can't seem to post anywhere else, Looking for a little help.

Probably will not find a u-bolt at NAPA. They should have the joints, but take the old ones with you. Compare the distance across the "cross", and the size of the bearing cap.
Problem is that none of this is stock on your vehicle. Good news is, if you get a genuine parts guy instead of a number puller, they should recognize the joint. There are several that are used and someone who is used to them can tell them apart.

When you get the right part, make a note of the part number in a notebook, and keep doing that for any parts you buy until you get to the point you can rattle off part numbers without consulting your notes.
Check out 1BEATK5's tag line back on post 13. Everything in there means something. On the third line, you see 1350cv s. The 1350 is a Spicer part number for a U-joint. In this case its a special kind of one called a Constant Velocity joint. They are used when the driveline angle is too much for a standard u-joint. They look like two U-Joints joined together.
The 1350 is the actual cross and bearing caps. Some are in CVs, and some in standard joints.

Don't worry if yours are not stock. EVERYbody upgrades their U-joints to bigger sizes sooner or later.
This is why you make notes. So you can walk into a parts house and ask for a Spicer 1350 and get the right part.
Even if your truck originally used 1330s.

Also, check all 4 caps for size. They make u-joints with two different sizes. I have a set on my truck. Sometimes you cannot get a yoke that fits a certain size rear end with the size U-joint you need to match your driveshaft.

As for the u-bolts, these are generally not a parts house item. But, they are usually an easy find in junkyards or neighbor's driveways late at night.......

If you have a Pick N Pull junkyard in your area, go make friends with them. I was blessed growing up to have a friend who owned his own junkyard.
Now I have to grub with the rest at the local PNP.

Do post the picture of the chip. Balance is not as worrysome in this case as strength.
There are some places you can chip off and it looks bad. There are other places that the joint will fail under a load.

The guys here will know. They have limped home with just about every type of U-joint yoke damage there is.

While you are taking pictures, take a couple of where the rear leaf springs mount onto the rear axle. Try to do it from the side, like over the rear chunk looking toward the tire.

We're going to need that.

J.
 
yep, Picks are worth a 1000 word to show us the damage on the drive shaft. I guarantee you found your vibration given your description. It sounds like you are already doing it but make sure you replace the u joints at both ends of the shaft. they operate as a complimentry pair and generaly wear / break at the same time. Keep the good looking one as a trail spare.

Also, make sure when you do go down to get the parts that you get U-Bolts not straps. Your yoke does not use straps.

Making an educated guess here but I am thinking we can narrow down your current drivetrain to a fairly small range of years. I would say you have a turbo350 Transmission
New Process 203 converted to part time
and a D44 front Axle
and a corp 12b rear axle.
All out of a 1973 - 1975 K5 Blazer. I am guessing more like 74 - 75.

DO NOT TAKE THIS AS GOSPEL but all the pieces you have there were stock for those years and were most likely swapped as a whole under the new truck.

That might be able to give you a head start on finding the correct parts. Looking at the images you posted it appears that you might be running 1310 joints. Tell the parts guy you have a 75 Chevy K5 Blazer and you need the rear drive shaft u joints and the u bolts. then compare what he brings out to your joint that you brought with you. that should get you a good start.

Cheers,

Rufus
 
I have not a clue if this is possible at all but im gonna explain it.
At the rear axle, the shaft is held on by two U-bolts. at the transfer case the shaft is held on by two straps. I kid you not. my dad was appoled. i have not a clue if its possible but im gonna try and get a pic of it so you can see....

along with the leaf springs like stated.

Thanks for gettin me through this guys. your worth a million bucks right now!
 
here's a look at the shaft end at the TC point..

DSCN0282.jpg
 
You are going to need a new yoke. That one is so right on the edge of, go ahead and use it just for driving around mildly, and don't even think about using it.

It will have to be replaced sooner or later. Its just too weak to stand up to hard use. But, if you want to just get it together for now to see how it works, it would probably stand up.
But that is just a guess.

The main question is, what caused that? It almost looks like the joint was at such an angle that it hit the other yoke.

But I don't think they will bend that way.
Is the opposite corner, under your thumb the same? I am thinking someone ground them like that for clearance.

If so, we will have to address the angle problem sooner than later.
That is what the spring pics are for.

Hang in there. We have made a lot of progress. So far, you still have a bargain compared to what some of the folks started with.

J.
 
OK, one last one, and I'm off to bed.

I am completely out of my field of expertise here, but this is what I under stand. Lots of folks will chime in here tomorrow and either confirm this or set me straight.

Those big steel blocks between the springs and the axle should either have a taper machined into them, or have a shim under them.
This causes the rear end to rotate when the bolts are tightened so the driveshaft yoke points a little more upward.
This helps the drive shaft angle.
Or so it seems from hanging around here.

These blocks, big u-bolts, and all that mounting hardware is some of the most critical parts on that truck when it comes to safety.

There are some really scary lift kits running around out there, and there have been some cases of bad wrecks when something broke.

Yours looks better than some I have seen. Even if I am half asleep.
I suspect you will be advised to either have the blocks machined or some shims added.
But, wait for the experts to wade in.

Straps will work, but they have some drawbacks. You may be in the market for a new yoke on the transfer case that will accept U-bolts.
That model T-case is real common, so you might be junkyard prowling.

Keep in the back of your mind, if you have to replace both yokes on that end of the shaft, you might investigate going to a stronger size.

For instance changing them from a 1310 to a 1350.
Again, let the guys who do this everyday chime in.

Good job today

J.
 
Unless it's an optical illusion the blocks do look slightly tapered with the short side pointed towards the front of the truck.
 
Yeah, its going to be funny 6-8 months from now, when he is rattling this stuff off and coming up with things we didn't think of.

J.
 
Unless it's an optical illusion the blocks do look slightly tapered with the short side pointed towards the front of the truck.
You know, one does and one doesn't. ( boy, wouldn't that screw up a setup<G>)

Last night, half asleep, neither one did. Today, using a caliper to measure the picture, one does seem to have a taper.

Either way, when the experts chime in, I suspect that its going to need more.


I'm good with electricity/electronics, not bad with hydraulics, good with mechanical engineering, pretty darn amazing in other areas.........
But I am a total Noob when it comes to lifting trucks.

When I was coming along, around here, you had two types of truck owners.
Ones who went with the factory lift or added slightly stronger springs, or total idiots who had to have a step ladder to get into their trucks.

I spent a lot of time winching them back upright, or scrounging good pieces off of what was left when they stopped rolling, or watching them change U-Joints.
Easy to do when you can sit in a chair under the truck and work on the transfer case end.

So, the whole lift kit mainia pretty much passed me by.
My SWB 3/4 ton handles 12.50-33s, and they, combined with my PTO winch, take me anywhere in the swamp I want to go.

My truck would not make it 50 feet up one of your rock trails, and one of your rock trucks would not make it 10 down some of my swamp trails.

I take that back. in 4hi with your foot in it, you would do pretty good until you found the first lightard stump.

To each his own.

J.
 
You measured the focking pic with a caliper?:haha::haha::haha:
Dang right. I just could not tell for sure if there was a taper or not.
Had some calipers laying nearby, so I went for it.
Looks like a very slight taper.
At least according to the camera.....

J.
 
I wish Fordum would have chimed in on my build thread when I started. The first post he made here was perfect. I didn't know jack about 4x4's and very little about cars, yet somehow I got talked into a 454 swap :crazy: and now I have a 14BFF sitting in my shop waiting for a D60 to come around... Alot to bite off for an 18 year old.
 
Well...... weas gonna put the DS back in but wipped the grease area out just to be safe and get a good look at the "fork" coming out of the transfercase. (proper name unknown) and lookie what we found..

DSCN0293.jpg


A nice large chip in the craddle where the U-Joint is supposed to sit. not the greatest im guessing, and another cause for the shaking. gonna be safe to drivelike that? guessing no...

an need a proper name or model number so I can look it up and order a new part...

Thanks for the help... Once again. LOL
 
You are looking at the output yoke from your New Process 203 transfer case. looks like you need to get a replacement from your wrecking yard.

You will need the rear output yoke for a 74 - 75 NP203 transfer-case. unbolt the old one and install the new one.

Cheers,
Rufus
 

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