carrier bearing

[71copperhead]

i have a longbed '71 pickup, and we had replaced the factory carrier bearing and the replacement lasted a year or two, then it tore the rubber out from the mount, so we replaced it again, and only drove it 1 time before it just totally ripped it off the mount. i'm thinking about looking into the one piece driveshaft, just curious as to what year and model of truck to get it out of. any help is appreciated, thank you

[demian5]

Coil or leaf spring truck? Another guy just went through this.

Read through this and see if it applies before we do the rodeo over again:

http://67-72chevytrucks.com/vboard/s...d.php?t=762070

[davepl]

I dunno the answer, but "it shouldn't do that". I'd be afraid that by putting in a different driveshaft you're potentially masking the problem. But I don't know what the problem is!

[sick472]

I have done some extensive reading on single vs dual drive shafts and the conversions and have come to the conclusion that the dual shaft design is great for our common truck builds. (I encourage you to do your own research and come to your own conclusions as I do not consider myself the end-all-be-all) Meaning that, unless you are getting into some serious horsepower and other out of the norm mods...the dual shaft design is what you want.

I suspect that you have a drive shaft problem. Out of balance, bent, or mismatched parts. There are quite a few combinations of pieces in these old drive shaft assemblies that can be mismatched from year to year and from coil to leaf spring applications. Again, do some reading and verify that you have the appropriate parts before jumping into the conversion. Most all of us have no problems with the dual shafts and some of us push 400 plus HP.

Have you lowered the truck?

What rear springs do you have? Has that ever been switched from one to the other?

Do you suspect that the new carrier bearing was bad out of the box?

EDIT, btw WELCOME TO THE CLUB!

[CC69Rat]

Drive shaft harmonics can destroy the carrier bearing fairly quickly and as others have mentioned, it usually just means the pinion angle is off. It wont take much to fix it, I / We just need to know some things to help you.

As mentioned, my first question would be is it lowered ?

Can you post a picture from the side of the truck, down low so we can see underneath it and the angle of the front of the pinion at ride height ? We'll start there.

Welcome to the board ! We'll get it figured out.

[Ironangel]

Your drive shaft(s) have probably taken a hit from a rock or a raccoon etc. Get it balanced or repaired and you should be good to go. As far as going to a one piece drive shaft, to each their own but I NEVER will. Whoever stated that one piece shafts are for higher horsepower applications needs to keep researching! All the muscle cars ran, and still do run two piece drive shafts, and for very good reasons. Somebody else right away goes to "pinion angle"...? If you haven't changed anything or slammed the truck down then your pinion angle is a moot subject. I've been running/pounding my identical carrier bearings with a 450+ HP Big Block for years now, and towing my drag truck with an identical carrier bearing behind a salty 350 small block for years as well. So this leads me to believe that perhaps the new carrier bearings are defective or, the drive shaft assemblies are bent and/or out of balance..."Just Sayin"

[Dibber13]

Can some please direct me to a carrier bearing MOUNT like the one in my profile picture. I cannot find this type of mount ANYWHERE on the web....

[demian5]

Originally Posted by Dibber13

Can some please direct me to a carrier bearing MOUNT like the one in my profile picture. I cannot find this type of mount ANYWHERE on the web....

That's a 3/4 ton one. Also,m CPP makes an adapter that allows you to use this bearing on a truck that uses the other bearing.

[Dibber13]

Originally Posted by demian5

That's a 3/4 ton one. Also,m CPP makes an adapter that allows you to use this bearing on a truck that uses the other bearing.

I have a 1970 1 ton dump. Thank you

[Rufas]

Originally Posted by Ironangel

Your drive shaft(s) have probably taken a hit from a rock or a raccoon etc. Get it balanced or repaired and you should be good to go. As far as going to a one piece drive shaft, to each their own but I NEVER will. Whoever stated that one piece shafts are for higher horsepower applications needs to keep researching! All the muscle cars ran, and still do run two piece drive shafts, and for very good reasons. Somebody else right away goes to "pinion angle"...? If you haven't changed anything or slammed the truck down then your pinion angle is a moot subject. I've been running/pounding my identical carrier bearings with a 450+ HP Big Block for years now, and towing my drag truck with an identical carrier bearing behind a salty 350 small block for years as well. So this leads me to believe that perhaps the new carrier bearings are defective or, the drive shaft assemblies are bent and/or out of balance..."Just Sayin"

No not correct. All GM 67 to 72 A Body cars: Chevelles, Pontiacs, Buicks and Olds use single piece driveshafts. I not aware of any GM muscle cars that use a two piece driveshaft. Typically two piece driveshafts are used for long wheel based vehicles.

If you have seen a GM 67 to 72 A Body with a two piece driveshaft someone has modified the driveline and it is not a factory setup.

[papsoldblue72]

I would love to do the same with my truck but mine being a long bed truck the question becomes will it interfere with the trailing arm brace??? mine is a leaf spring truck so I guess I could take it out and make something else or cut it out …. I don't know....

[Dibber13]

I need a replacement crossmember. Mine is badly rotted

[demian5]

Originally Posted by Dibber13

I need a replacement crossmember. Mine is badly rotted

Ah ok, that makes more sense.

[Dibber13]

I have searched for a month trying to locate this particular type of carrier crossmember ��
Any advice on where else I can look..?

[Hart_Rod]

Originally Posted by Dibber13

I have searched for a month trying to locate this particular type of carrier crossmember ��
Any advice on where else I can look..?

Are you talking about the mount that allows you to use the Heavy Duty carrier bearing? If so, I have one.

[Dibber13]

Originally Posted by Hart_Rod

Are you talking about the mount that allows you to use the Heavy Duty carrier bearing? If so, I have one.

Yes! My truck is a 1970 1 ton Dump truck. Can you take a picture. ? I am in NEED of one. Thanks!

[HO455]

Originally Posted by Dibber13

I have searched for a month trying to locate this particular type of carrier crossmember ��
Any advice on where else I can look..?

Your looking for a 3/4 ton crossmenber 63-72 for that style of bearing, possibly one ton also. Check the classified section for some one parting a truck or Burban.

[68Gold/white]

I'm a Chevy guy, not even a doubt, but that ruinated carrier bearing assy. in post 1 is not unusual. I sold auto parts from 1985-1998, sold a ton of those specific carrier bearings. Had problems with waaay too many. Part of the problem is they are made poorly, AND designed poorly!!!

When I get my 67 and 68 going NEITHER will have that mickey mouse carrier bearing setup!!!

My 68 has an entirely different (and better) carrier bearing setup. Two pieces of metal that, kinda look like two clamshell half pieces, that bolt together. It has this type CB, because the engine is a 396. Others here have them on longhorn editions. I will not use this deal either, the driveshaft is too small in diameter....
Someone here is looking for just the rubber for one of these, I don't have a clue.

Dibber, I don't know what the frame looks like under your pickup, BUT, IF the crossmember attaches to the frame sides, you might be able to use a craoomember like in post 1 that fits 1/2 and 3/4 tones. You might be able to adapt a large piece of angle iron to adapt the carrier bearing the your pickup has now. You'd want to measure where your carrier bearing assy hangs, from maybe the bed floor, so you could get it back exactly in that position. The piece that's in post one, that holds that particular carrier bearing is riveted to that crossmember, you'd ahve to drill out the rivets, and/or grind them down also, none it that will be easy or fun. If this is possible, you may have to let the carrier bearing hang down, instead of having it positioned like on your pickup....

The other choice might be to make a new crossmember. I've seen a lot of these pickups, and your's has a pretty uncommon crossmember and type of carrier bearing for a pickup made priior to 1973...

[Dibber13]

Originally Posted by 68Gold/white

I'm a Chevy guy, not even a doubt, but that ruinated carrier bearing assy. in post 1 is not unusual. I sold auto parts from 1985-1998, sold a ton of those specific carrier bearings. Had problems with waaay too many. Part of the problem is they are made poorly, AND designed poorly!!!

When I get my 67 and 68 going NEITHER will have that mickey mouse carrier bearing setup!!!

My 68 has an entirely different (and better) carrier bearing setup. Two pieces of metal that, kinda look like two clamshell half pieces, that bolt together. It has this type CB, because the engine is a 396. Others here have them on longhorn editions. I will not use this deal either, the driveshaft is too small in diameter....
Someone here is looking for just the rubber for one of these, I don't have a clue.

Dibber, I don't know what the frame looks like under your pickup, BUT, IF the crossmember attaches to the frame sides, you might be able to use a craoomember like in post 1 that fits 1/2 and 3/4 tones. You might be able to adapt a large piece of angle iron to adapt the carrier bearing the your pickup has now. You'd want to measure where your carrier bearing assy hangs, from maybe the bed floor, so you could get it back exactly in that position. The piece that's in post one, that holds that particular carrier bearing is riveted to that crossmember, you'd ahve to drill out the rivets, and/or grind them down also, none it that will be easy or fun. If this is possible, you may have to let the carrier bearing hang down, instead of having it positioned like on your pickup....

The other choice might be to make a new crossmember. I've seen a lot of these pickups, and your's has a pretty uncommon crossmember and type of carrier bearing for a pickup made priior to 1973...

Wow..! That is a heck of an answer... Thank you for the support.. The way I see it, the part lasted thru 48+ years; rain, snow and hundreds of tons of weight so I think it served its purpose...
Since I cannot seem to find on, I started to fab a replica..
Thanks again!!

[Mike C]

That is the HD carrier bearing and there wasn't a lot of rhyme or reason to when they were installed it seems. My 69 short step 307 leaf spring truck has the HD bearing so you never know what you will find them in.

[Dibber13]

Originally Posted by Mike C

That is the HD carrier bearing and there wasn't a lot of rhyme or reason to when they were installed it seems. My 69 short step 307 leaf spring truck has the HD bearing so you never know what you will find them in.

Yes Mike, I have a 70' C30 Dump (leaf) and I need the Assembly (frame to frame) mount that holds the carrier bearing.

[Rufas]

Originally Posted by 68Gold/white

I'm a Chevy guy, not even a doubt, but that ruinated carrier bearing assy. in post 1 is not unusual. I sold auto parts from 1985-1998, sold a ton of those specific carrier bearings. Had problems with waaay too many. Part of the problem is they are made poorly, AND designed poorly!!!

When I get my 67 and 68 going NEITHER will have that mickey mouse carrier bearing setup!!!

My 68 has an entirely different (and better) carrier bearing setup. Two pieces of metal that, kinda look like two clamshell half pieces, that bolt together. It has this type CB, because the engine is a 396. Others here have them on longhorn editions. I will not use this deal either, the driveshaft is too small in diameter....
Someone here is looking for just the rubber for one of these, I don't have a clue.

Dibber, I don't know what the frame looks like under your pickup, BUT, IF the crossmember attaches to the frame sides, you might be able to use a craoomember like in post 1 that fits 1/2 and 3/4 tones. You might be able to adapt a large piece of angle iron to adapt the carrier bearing the your pickup has now. You'd want to measure where your carrier bearing assy hangs, from maybe the bed floor, so you could get it back exactly in that position. The piece that's in post one, that holds that particular carrier bearing is riveted to that crossmember, you'd ahve to drill out the rivets, and/or grind them down also, none it that will be easy or fun. If this is possible, you may have to let the carrier bearing hang down, instead of having it positioned like on your pickup....

The other choice might be to make a new crossmember. I've seen a lot of these pickups, and your's has a pretty uncommon crossmember and type of carrier bearing for a pickup made priior to 1973...

You will find that setup on 3/4 ton long bed GMCs. My 70 2500 GMC long bed Camper Special with a 350 SB and a Turbo 350 has that style support bearing.

[CastIron]

This may or may not be helpful, but this is what my '69 C1500 (307/3 speed manual trans) long wheelbase with leaf springs looks like:

[Dibber13]

Originally Posted by CastIron

This may or may not be helpful, but this is what my '69 C1500 (307/3 speed manual trans) long wheelbase with leaf springs looks like:

My Carrier crossmember looks a lot like my trans crossmember. Mine is way different than the one in you picture but thank you!

[Hart_Rod]

Originally Posted by CastIron

This may or may not be helpful, but this is what my '69 C1500 (307/3 speed manual trans) long wheelbase with leaf springs looks like:

This is the one I have.