Twisted yoke

[2059]

I noticed when removing the driveshaft the other day, I didn’t have the same amount of travel I did when it was installed. It felt like it was bottoming out on the transmission tail shaft. If you look closely you can see a twist in the spines about 7/8 of the way in on the yoke.

Here’s the question. What yoke are you high torque RB and Hemi guys using?
Thanks

 

[wedge69]

Wow never saw that before !

 

[2059]

Wow never saw that before !

Ya, me neither. I may also have a pinion angle issue (not sure one has anything to do with the other) but I'll check it out when I the car back on all 4's in the next couple of weeks.

 

[Cranky]

How fast is your car? Started a 'wall of carnage' years back but quit because my place is already too full of junk. Seen a lot of broken parts over the years so that doesn't surprise me. It was getting pretty close to total failure tho....

 

[68 HEMI GTS]

i just did that to the spicer that was in the Roadrunner( i actually had to beat it out with a hammer). Mark Williams billet yoke is the answer. i think thats what i have in my dart also, but im not sure without looking.

 

[2059]

How fast is your car? Started a 'wall of carnage' years back but quit because my place is already too full of junk. Seen a lot of broken parts over the years so that doesn't surprise me. It was getting pretty close to total failure tho....

Don't know Cranky, it's just a solid street car and I only have 350 miles on it and half a dozen hole shots. I about crapped down both legs when I found it since I hadn't yet installed the driveshaft loop. You can bet it will be installed when I reassemble.

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i just did that to the spicer that was in the Roadrunner( i actually had to beat it out with a hammer). Mark Williams billet yoke is the answer. i think thats what i have in my dart also, but im not sure without looking.

Thanks 68. I'll look into their stuff.

 

[Supershafts]

Who's slip yoke is it ? and which series ? I use spicer on mine w/727 no twisting issues

 

[2059]

Who's slip yoke is it ? and which series ? I use spicer on mine w/727 no twisting issues

It was supplied with the trans from Passon. I don't know who made it although I did send a picture to Jamie and he'd never seen such a thing before. I ordered a Mark Williams shaft assy yesterday.

 

[khryslerkid]

If it was only 7/8" of shaft inserted, might mean there's something too short? I would think the damaged area was where that amount of shaft was inserted and not any more...

 

[Meep-Meep]

My observation is the deformed area is at point contact toward the inside NOT the entire length of the spline (as it appears from here anyway). The yoke didn't fit tight to the splines on the shaft so it's possible under high torque the yoke cocks on the output shaft and the load is no longer transferred equally across the entire length of the splines. Sure there is a tail shaft bushing, but those don't fit all that tight (IMO a separate issue all together that also needs to be resolved).

 

[2059]

you guys are right there IS more going on here. there's a pinion angle issue. I dropped the rear end this afternoon and am running it back down to Moser Engineering on monday. I want to go over the entire set-up and make sure it's the right duty and get the right perch position for a 4* down angle.

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My observation is the deformed area is at point contact toward the inside NOT the entire length of the spline (as it appears from here anyway). The yoke didn't fit tight to the splines on the shaft so it's possible under high torque the yoke cocks on the output shaft and the load is no longer transferred equally across the entire length of the splines. Sure there is a tail shaft bushing, but those don't fit all that tight (IMO a separate issue all together that also needs to be resolved).

You got me thinking Meep. If that's the case and the yoke cocked in the housing; then the opposite/equal result should be a flared/cracked tail housing or a ring pattern on the outside of the yoke toward the u-joint.

 

[Meep-Meep]

you guys are right there IS more going on here. there's a pinion angle issue. I dropped the rear end this afternoon and am running it back down to Moser Engineering on monday. I want to go over the entire set-up and make sure it's the right duty and get the right perch position for a 4* down angle.

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You got me thinking Meep. If that's the case and the yoke cocked in the housing; then the opposite/equal result should be a flared/cracked tail housing or a ring pattern on the outside of the yoke toward the u-joint.

I can see that. Definitely keep us posted. Interesting problem for sure.

 

[Supershafts]

It was supplied with the trans from Passon. I don't know who made it although I did send a picture to Jamie and he'd never seen such a thing before. I ordered a Mark Williams shaft assy yesterday.

Post a pic of that slip from all sides, i have a suspicion its china, Spicer doesn't make a slip with a counter bore like that, detroit has been gone since the early 90's, so i think you got bit by china.

Send me or post the pics of that slip from both sides of the joint ears and the both flat sides.

As per the other questioning , as for where the splines twisted it looks like you have atleast 1 inch in, and so you know the amount of engagement for splines are diameter x length, so if the diameter is 1" you only need 1" of engagement, now thats the rule for all spline engagement, on slip yokes there is a need for suspension movement so that makes it different otherwise the rule is diameter equals engagement.


.

 

[2059]

dropped off the assy. at Moser's today. perch relocation. brake hose bracket relocation. set up will be 4* down pinion as mentioned. also going to box the perches since i bent the f@#% out of them. This is part of the correct duty for the torque. also inspected the springs this afternoon. bent center pins. i'll set up a "torque block" which is nothing more that an a set of blocks bolted together that clamp the spring stack in front of the bottom plate that helps the u-bolts hold the bottom plates in place. i'll post some shots when done. Here are a couple shots when i was there. second shot is a "before" "after". the diff. in the back of the cart was ordered through Jegs that was built by Moser and the guy brought it in to have a new setup built with upgrades. the shop guys wheeled this out for pick-up while i was there. they didn't know what it was going in. pretty cool though...

 

[2059]

back to the car. here are the shots of the yoke from the outside that Supershafts was asking about. plus the spring pins, bent and over time, probably sheared. 400 miles and 1/2 dozen hole shots replaced with G8 bolts and SAE hardened washers and lock nuts.

 

[Plumcrazybee]

Looks like you got it well on it's way to not breaking ever again. I will just throw in my vote for Mark Williams yokes and driveshafts. I know my little 440 will never break their 1350 u-joints and yokes.

There is no way. No, it will probably be the numbers matching 23 spline 4 speed that breaks while I wait patiently for Passon to call.

 

[Supershafts]

You have a china slip yoke, which is EXACTLY why it twisted.

Gotta ALWAYS ALWAYS tell whoever you are buying **** from, "keep the china on the shelf"

Spicer slips wont twist, the old original detroits won't twist.

 

[2059]

You have a china slip yoke, which is EXACTLY why it twisted.

Gotta ALWAYS ALWAYS tell whoever you are buying **** from, "keep the china on the shelf"

Spicer slips wont twist, the old original detroits won't twist.

I can't blame Jamie for this; I never even thought to ask plus; when i originally started this project 2 years ago i didn't think the Tq/Hp would be in this range. guess I should have known better, you can never have enough power so matching the components is critical.

 

[68 HEMI GTS]

You have a china slip yoke, which is EXACTLY why it twisted.

Gotta ALWAYS ALWAYS tell whoever you are buying **** from, "keep the china on the shelf"

Spicer slips wont twist, the old original detroits won't twist.

i have a spicer in my garage thats twisted. and it was just behind a 440. the clutch got it. my guess is its Chinese with spicer stamped on it but....

 

[2059]

I think i'm gonna saw the yoke in half, lengthways, and mount 1/2 in a frame in the bathroom and the other 1/2 in a frame over the shop door... maybe call the mancave "THE TWISTED YOKE" or "TWISTED YOKE SALOON"... something like that.. silly sh1t...