1967 Chevy CST aka "the loud truck"

[67chevy1series]

Well the parts for this thing keep stacking up.. I finally bought a positraction today, I sent off the money and I'm waiting for him to get it. So happy to finally get one!

[Ol Blue K20]

that will back burnouts a little more entertaining....

[67chevy1series]

My burnouts will look a little more symmetrical lol

[Ol Blue K20]

Originally Posted by 67chevy1series

My burnouts will look a little more symmetrical lol

Hey now watch them big words...I might get confused....

[67chevy1series]

Originally Posted by Ol Blue K20

Hey now watch them big words...I might get confused....

just bought my rear calipers and pads so those should be arriving soon. found some original 72 16'' steel rims on here for $250 problem is i have a collge budget and thats gonna be alot on shipping lol

[Ol Blue K20]

Originally Posted by 67chevy1series

just bought my rear calipers and pads so those should be arriving soon. found some original 72 16'' steel rims on here for $250 problem is i have a collge budget and thats gonna be alot on shipping lol

College....that explains them big words....yeah, you need to stick to your budget...nonessential parts can wait if need be.

[67chevy1series]

It's easy to do payments but paying a big amount I money at one time kinda sucks :/. If I had a compute or if my iPhone could post pictures then I would but it can't so that's the only reason why I havent posted pictures

[67chevy1series]

Oh I see that's the way it is in la grange. Yeah hopefully he'll let me do payments.

[67chevy1series]

Recieved my CPP rear calipers in the mail yesterday an also today my posi was sent out.
And on a somewhat truck related note I've been buying some new tools, there craftsman but that doesn't bother me I like them an there trade in policy and etc so ill have a nice set of wrenches to use on my rear disc and posi upgrade... I will take pictures of the whole process for you guys and then ill upload them somehow.. Stay tuned

[NewType72]

Sounds good brother. And hey I'm a craftsman guy I take offense to that just joking

[67chevy1series]

Lol the only reason why I piste that was because I didn't want anybody trying to get on my case about getting craftsman, I really do like craftsman pretty much all of my tools are craftsman actually lol

[NewType72]

Originally Posted by 67chevy1series

Lol the only reason why I piste that was because I didn't want anybody trying to get on my case about getting craftsman, I really do like craftsman pretty much all of my tools are craftsman actually lol

Oh haha well if people are in her to correct someone choice in tools this is the wrong forum for that

[67chevy1series]

That's true! I like a tool company that makes tools that are real hard to break, good in design an has a good return policy then there's nothing more you can ask for! So craftsman, snap on, Mac tools all good brands plus there all old school brands makes then even better.

[Ol Blue K20]

Craftsman makes excellent tools.. a lot of mine are craftsman. Snap on and mac always tells me that I abused em..but they have some stuff craftsman doesn't...sigh

[shawno72]

Craftsman are for girls

[Ol Blue K20]

Originally Posted by shawno72

Craftsman are for girls

Aw man...that explains all the girls in my garage..

[67chevy1series]

Haha that's fine with me more girls to come join me in my build haha

[shawno72]

I guess I need a craftsman truck

[Ol Blue K20]

Originally Posted by shawno72

I guess I need a craftsman truck

[67chevy1series]

Hahaha don't we all? Lol

[67chevy1series]

Well I started the posi/rear disc swap on the 67, I'm taking a bunch of pics for you guys and when I'm all done with it and the trucks back driving again then ill post me for you guys ill check back soon

[Ol Blue K20]

Originally Posted by 67chevy1series

Well I started the posi/rear disc swap on the 67, I'm taking a bunch of pics for you guys and when I'm all done with it and the trucks back driving again then ill post me for you guys ill check back soon

Good luck and the pics need to be of two tires smokin

[67chevy1series]

Well the posi install isn't going so smooth.. This is what I have and what I think I know:
The posi carrier is from a 67 12 bolt and was 4.11 gear ratio.
My rear axle is a 71 12 bolt and is a 3.73 gear ratio. Now from what I understand the 3.73 and 4.11 gear ratios both use a 4 series carrier.

So this is what I've done: I took the non posi 3.73 carrier out, and I left the pinnion in I didn't even touch it, then I took the ring gear off and installed it on the posi carrier I bought new bearings and installed them they went on just like they should of I also bought new races to go with the bearings when I went to go install the posi I ended up breaking one of the shims that came in my axle so I bought a shim kit so I set the carrier in and shimmed it almost every way possible I put equal amounts of shims and I couldn't even turn the differential it wasn't even budging so finally I got the differential to spin somewhat easily but that was with the shims on the passenger side and no shims on the drivers side... And if the carrier is moved to the drivers side then the axle shafts are going to move to the right..
So please somebody help me and tell me what I'm doing wrong I'm burnout on what to do.. :/

[jbclassix]

Originally Posted by 67chevy1series

Well the posi install isn't going so smooth.. This is what I have and what I think I know:
The posi carrier is from a 67 12 bolt and was 4.11 gear ratio.
My rear axle is a 71 12 bolt and is a 3.73 gear ratio. Now from what I understand the 3.73 and 4.11 gear ratios both use a 4 series carrier.

So this is what I've done: I took the non posi 3.73 carrier out, and I left the pinnion in I didn't even touch it, then I took the ring gear off and installed it on the posi carrier I bought new bearings and installed them they went on just like they should of I also bought new races to go with the bearings when I went to go install the posi I ended up breaking one of the shims that came in my axle so I bought a shim kit so I set the carrier in and shimmed it almost every way possible I put equal amounts of shims and I couldn't even turn the differential it wasn't even budging so finally I got the differential to spin somewhat easily but that was with the shims on the passenger side and no shims on the drivers side... And if the carrier is moved to the drivers side then the axle shafts are going to move to the right..
So please somebody help me and tell me what I'm doing wrong I'm burnout on what to do.. :/

www.ringpinion.com

ok.... going back and trying to sort this out..

first, there is a passenger car 12 bolt and a truck 12 bolt axle. If your posi came from a truck 4.11 then it should fit your 3.73 gears. The carrier break is 3.42/3.73. If it came from a car, sell it and put your non posi back in.

2nd, I don't see anything about contact pattern in anything you posted so far, so...

Assuming you have a truck posi, Here is my advice..

Remove your ring gear from your carrier. This will prevent contact interference between ring and pinion while establishing carrier pre-load.

Set your carrier up with enough shims so that you have 0 end play. For the garage install, your carrier should go in "snug" since you aren't using a spreader, but should turn freely once installed and caps torqued.

Once you have your total shim pack thickness established for 0 end play, you can remove the carrier and re-install the ring gear.

Now, I recommend recording your total shim thickness for reference. You can now establish your CONTACT PATTERN. judging from what you are saying, I would start with all the shims on the passenger side of the carrier. If you have questions about which way to move the ring gear, I can get into that if you need.

In reference to you talking about the axle shafts moving right or left, you could shim your carrier all the way to one side and it wont move your axle shafts any significant amount. you do need to ensure that the spline count is right between your shaft and the side gears.

One more thing that I highly advise is inspect or replace your axle bearings, and replace the axle seals no matter what.

Another thing you can do while you are into your axle is check pinion pre-load. You don't want to allow a failure to ruin all your hard work!

[67chevy1series]

Originally Posted by jbclassix

www.ringpinion.com

ok.... going back and trying to sort this out..

first, there is a passenger car 12 bolt and a truck 12 bolt axle. If your posi came from a truck 4.11 then it should fit your 3.73 gears. The carrier break is 3.42/3.73. If it came from a car, sell it and put your non posi back in.

2nd, I don't see anything about contact pattern in anything you posted so far, so...

Assuming you have a truck posi, Here is my advice..

Remove your ring gear from your carrier. This will prevent contact interference between ring and pinion while establishing carrier pre-load.

Set your carrier up with enough shims so that you have 0 end play. For the garage install, your carrier should go in "snug" since you aren't using a spreader, but should turn freely once installed and caps torqued.

Once you have your total shim pack thickness established for 0 end play, you can remove the carrier and re-install the ring gear.

Now, I recommend recording your total shim thickness for reference. You can now establish your CONTACT PATTERN. judging from what you are saying, I would start with all the shims on the passenger side of the carrier. If you have questions about which way to move the ring gear, I can get into that if you need.

In reference to you talking about the axle shafts moving right or left, you could shim your carrier all the way to one side and it wont move your axle shafts any significant amount. you do need to ensure that the spline count is right between your shaft and the side gears.

One more thing that I highly advise is inspect or replace your axle bearings, and replace the axle seals no matter what.

Another thing you can do while you are into your axle is check pinion pre-load. You don't want to allow a failure to ruin all your hard work!

the posi was pulled out of a 67 suburban so according to what you said it should work. when i put the posi in my axle shafts were able to go in and at one point i did have it in and fully working the problem was that i had no shims on the left side and a bunch of shims to the right, now i know you said it wont move my axle shafts in the axle but i have to disagree because when i set it all up and put the shafts in with the pin thought the carrier my driver axle shaft was approx. 1'' out and on the passenger side it moved it in approx. 1'' and it was a sombi*** to put the c clip on the passenger when i went top mount me rear caliper brackets i had to install 6 washers just to bring the bracket inward so my caliper would align with my rotor on the axle shaft... now i didn't install it wrong so i don't see any error in what i did except installing all the shims to one side, but that was the only way i could move the posi freely and everything still be hooked up. as you can see in the picture my carriers are different and the "offset" (for lack of a better term) is off a pretty good amount. i completely understand what you are saying and im not trying to aggravate or confuse you but for some reason what you are telling me is correct and i did the correct work but even after all that the posi just doesn't want to cooperate lol