Did the 1/2 ton short beds come with a two piece driveshaft?

[special-K]

Originally Posted by Keith Seymore

Tim - if you EVER have any questions on any of this engineering stuff I am happy to answer them for you.

K

Keith that's an awesome offer. I wish I had a list made up already

[Mike C]

There is at least one more carrier bearing as well, the “Heavy Duty” which is in the triangular shaped clamshell. That’s what is on my ‘69 short step which is 307/TH350 powered and 3.07 gears. Obviously a two piece since it has the carrier bearing.

[Gregski]

Originally Posted by Mike C

There is at least one more carrier bearing as well, the “Heavy Duty” which is in the triangular shaped clamshell. That’s what is on my ‘69 short step which is 307/TH350 powered and 3.07 gears. Obviously a two piece since it has the carrier bearing.

thanks, would you have a pic to share with us please and thank you

[Ironangel]

I dont think the SWB K (4x4) trucks had two piece shafts. Im not sure any of the K/10's or K/20's had two piece shafts. Both my 72 C/10's have the two piece shafts with the tear drop carrier bearings. Something I didn't realize until last Thursday is, those tear drop or light duty carrier bearings are mounted in rubber designed to move forward and backward with the vertical movement of the rear axle. I was going to have the driveshaft shop install a $108 dollar billet aluminum carrier bearing and the tech said that would be fine but a slip joint would have to be installed in the rear half of the shaft. Those billet carrier bearings are molded in polyurethane that is bonded to the aluminum, they wont give or flex at all which leads to premature wear on the carrier bearing and pinion components.
That two piece shaft Gregski showed has the slip joint already in it. The shaft assembly I took in was out of a 3/4 ton C/20 that had a 400TH Trans and a Dana 60 rear axle, yet it too had the tear drop carrier bearing. It did have a 3-1/2" diameter rear half shaft with a 1310 yoke on the front and a 1350 yoke on the rear. I had to have the front shaft shortened 1", 1350 yokes welded on both shafts and a new bone stock carrier bearing installed so he could balance the whole assembly.

[palallin]

Originally Posted by Ironangel

Im not sure any of the K/10's or K/20's had two piece shafts.

Mine certainly does have a 2 piece. See my sig for the other particulars.

[special-K]

I've never had a 4wd with a 2pc driveshaft, long, short, 1/2t, 3/4t, 3sp, 4spd, auto

[Keith Seymore]

Originally Posted by special-K

Keith that's an awesome offer. I wish I had a list made up already

I also do "abandoned factory" driving tours in Detroit and the surrounding burbs, if you are ever in the area.

K

[Mike C]

Originally Posted by Gregski

thanks, would you have a pic to share with us please and thank you

Here is the link to the thread where I R&R’d the bearing.

http://67-72chevytrucks.com/vboard/s...d.php?t=656307

[Mike C]

Originally Posted by palallin

Mine certainly does have a 2 piece. See my sig for the other particulars.

A driveshaft with a slip joint in the middle is NOT a two piece driveshaft as referred to here. A two piece driveshaft has 3 u-joints and is supported by a carrier bearing in the middle.

[Gregski]

can someone confirm that indeed the long bed trucks and the short bed trucks that had a two piece drive shaft the longer shaft was the same length, the longer being the one going from the center trailing arm support bracket (where the center bearing mounts to) to the rear axle

I just bought one from supposedly a long bed truck and that section is about a foot too long on my '71 short bed

[Keith Seymore]

Originally Posted by Gregski

can someone confirm that indeed the long bed trucks and the short bed trucks that had a two piece drive shaft the longer shaft was the same length, the longer being the one going from the center trailing arm support bracket (where the center bearing mounts to) to the rear axle

I just bought one from supposedly a long bed truck and that section is about a foot too long on my '71 short bed

No; they are all different.

Probably a dozen front shaft part numbers, and maybe two dozen rear shaft part numbers.

Have you seen the brake charts that I refer to from time to time?

There are propshaft charts like that, too. I asked the engineer for a copy of the charts and he said he would supply them, but never came through.

K

[Mike C]

The carrier bearings mount mostly in the same place depending on which of the 3 (more?) styles you get. But rear shafts will be different depending on wheelbase and rear diff. And in the front, it depends on which transmission you have and which engine combination. So as described above, there are lots of combinations of front/rear lengths. And u-joint size for that matter. 1310/1330/1350.

[palallin]

Originally Posted by Mike C

A driveshaft with a slip joint in the middle is NOT a two piece driveshaft as referred to here. A two piece driveshaft has 3 u-joints and is supported by a carrier bearing in the middle.

Which mine has: 3 u-joints and and a carrier bearing. Please don"t try to tell me what is under my truck. I've had it off and apart for u-joint replacement, all three of them.

[Gregski]

Originally Posted by Keith Seymore

No; they are all different.

so you're saying there's a chance, lol

on a serious note I love learning about this stuff even if it costs me a few Benjamins to do so, my mentality is: Education Costs, plus I never had any issues selling used / unwanted drive shafts as our local Pick N Pull gals love to destroy them with their fork lifts as they play junk yard tetris with them cars and trucks

[special-K]

I keep a collection of driveshafts. You can always make them longer or shorter... if you have one

[Gregski]

Originally Posted by special-K

I keep a collection of driveshafts. You can always make them longer or shorter... if you have one

how do you make one longer?

[special-K]

Originally Posted by Gregski

how do you make one longer?

New length of tube.

[palallin]

So, just to clarify: my '69 K-10 LWB does indeed have a 2-piece driveshaft, 3 u-joints w/ a carrier bearing in the middle. I can't speak to what any other truck might or might not have, but mine has it. It cannot be said that no 4wd from the era has a 2-pc shaft.

[special-K]

Right. I would never say that. I have seen long bed 4wd 67-72s with 2pc driveshaft. Just saying I have owned quite a few and they all had 1pc.

[Gregski]

so I just picked up another "long bed drive shaft" and this one is too short for my short bed, LOL

note yet the different style center bracket

my guess is that the donor truck had a differential with a longer (I think it's called) third member

that or maybe the truck had a Dana diff, I think the seller pointed out a bunch of trucks on his lot that actually had Dana rear differentials

any thoughts on this folks?

[mr.mud1]

Originally Posted by Gregski

so I just picked up another "long bed drive shaft" and this one is too short for my short bed, LOL

note yet the different style center bracket

my guess is that the donor truck had a differential with a longer (I think it's called) third member

that or maybe the truck had a Dana diff, I think the seller pointed out a bunch of trucks on his lot that actually had Dana rear differentials

any thoughts on this folks?

you may be onto something there,that picture of the crossmember with the trailing arms attached and the bracket that the steady bearing would bolt to,is identical to what's in my 72 truck,with a Dana 60 and leaf springs.

[Gregski]

Originally Posted by mr.mud1

you may be onto something there,that picture of the crossmember with the trailing arms attached and the bracket that the steady bearing would bolt to,is identical to what's in my 72 truck,with a Dana 60 and leaf springs.

Thanks for the reply, I forgot to mention that the U joint cup sizes were much larger than my 1/2 tons 12 bolt's and even larger than the ones on the 1 ton drive shaft I picked up earlier

and here's a pic of what claims to be a Dana 60 on the Internet, note the longer snout

[mr.mud1]

Originally Posted by Gregski

Thanks for the reply, I forgot to mention that the U joint cup sizes were much larger than my 1/2 tons 12 bolt's and even larger than the ones on the 1 ton drive shaft I picked up earlier

and here's a pic of what claims to be a Dana 60 on the Internet, note the longer snout

yes sir,that looks like a DANA 60,here's the Dana 60 and hardware from my 72 big block 3/4 ton truck.all the best.Greg

[Gregski]

Originally Posted by mr.mud1

yes sir,that looks like a DANA 60,here's the Dana 60 and hardware from my 72 big block 3/4 ton truck.all the best.Greg

thank you so much, you are a Rock Star, and man that rig looks clean, the exhaust looks beautiful, did you do that yourself? (lie if you have to, ha ha)

just uploaded a EV Conversion Drive Shaft Purgatory YouTube video

[mr.mud1]

Originally Posted by Gregski

thank you so much, you are a Rock Star, and man that rig looks clean, the exhaust looks beautiful, did you do that yourself? (lie if you have to, ha ha)

just uploaded a EV Conversion Drive Shaft Purgatory YouTube video

ha-ha.thanks.the truck is very clean,the best one i've ever had.it's from California and was in storage from 1999 til just a couple years ago.i can't lie,i'm no good at it.mom always said,tell 1 lie and you have to tell 10 more to cover it up.i'm not that smart.i did built the front part of the exhaust,found mufflers that would work with 2 1/5 inlets and 2 1/4 outlets but ordered 2 1/4 tailpipes from Waldron's exhaust in Michigan.i've used them several times,the local parts stores have nothing,can't get much.i emailed Walker and they no longer make the pipes.very happy with Waldron's stuff.take care.