Which slip yoke ?
Which slip yoke ? 98 Z28
4L80E swap
Which slip yoke do I need ?
99 truck transmission donor.
Used TH400 yoke but having issues with noise and vibration.
Over 50 mph has a harsh vibration from around Trans area.
Didn't have any vibration issues with the TH400 w/trans brake.
Used same driveshaft.
Any help is greatly appreciated.
4L80E swap
Which slip yoke do I need ?
99 truck transmission donor.
Used TH400 yoke but having issues with noise and vibration.
Over 50 mph has a harsh vibration from around Trans area.
Didn't have any vibration issues with the TH400 w/trans brake.
Used same driveshaft.
Any help is greatly appreciated.
The yoke can be rocked by hand at the tailhousing like its very loose fitting in the 4L80E . I got this car as a project car my friend built before his passing . I'm trying to get it sorted out to be race ready to see what it can do ,but this vibration is not gonna let that happen.
I think in need to verify the driveline angle is adding up , it's got a Moser 12 bolt and a short body mount Spohn Torque arm so there is adjustments available.
I see posts where people talking about a tailshaft housing bushing that's wears out and I need to know more about that to verify what's going on with it too.
Thanks for the ideas.
TECH Enthusiast
Joined: Sep 2016
Posts: 518
Likes: 0
From: North Jersey
Sorry about your friend.
Is it possible that the driveshaft isn't long enough and there's very little yoke engaged in the output shaft letting it pivot on it?
How far in does it go into the trans?
Is it possible that the driveshaft isn't long enough and there's very little yoke engaged in the output shaft letting it pivot on it?
How far in does it go into the trans?
Car was in indoor storage for 4.5 years before I was offered the chance to pick it up and finish it.
I thought the yoke looked a little short , but , I haven't done a TH400 or 4L80E swap in an F-Body before so I have nothing to compare this with. <br/>
Current driveshaft has a Counterbored yoke , I noticed the output shaft has a threaded hole in the end.
So that makes the 99 truck a fixed yoke (donor),right?
Looks like this is the needed slip yoke.
http://www.dennysdriveshaft.com/p69_..._on_truck.html
Anyone care to comment on this being the needed yoke for my 98Z28 4L80E swap?
Thanks in advantage , David
So that makes the 99 truck a fixed yoke (donor),right?
Looks like this is the needed slip yoke.
http://www.dennysdriveshaft.com/p69_..._on_truck.html
Anyone care to comment on this being the needed yoke for my 98Z28 4L80E swap?
Thanks in advantage , David
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo If I could post a video, I have a short video that shows how much the tail shaft moves without the driveshaft and how much everything moves with the driveshaft installed.
You can even hear the slop as it clunks and bangs with just slight pressure.
Trans has less than a few hundred miles on it , unfortunately I do not know who rebuilt it though. My friend only put around 25 miles on it before he passed and didn't tell anyone what he was doing to try to repair this.
Car went 11.01@127 on a Trans braked TH400, this setup was what he was working on and never got to finish and I am trying to sort out pieces and parts and previous work done to be able to complete the project.
Cars a Beast ,just vibrates like crazy about 50 mph and don't even think about doing a brake stand (sounds like it's gonna explode) low mph barely break traction kind of brake stand .
I read about one case where the poster found his tailshaft housing. Having had .025" wear and was out of round due to irregular wear from pinion angle issues and driveshaft whip (balance issue).
Still banging my head
You can even hear the slop as it clunks and bangs with just slight pressure.
Trans has less than a few hundred miles on it , unfortunately I do not know who rebuilt it though. My friend only put around 25 miles on it before he passed and didn't tell anyone what he was doing to try to repair this.
Car went 11.01@127 on a Trans braked TH400, this setup was what he was working on and never got to finish and I am trying to sort out pieces and parts and previous work done to be able to complete the project.
Cars a Beast ,just vibrates like crazy about 50 mph and don't even think about doing a brake stand (sounds like it's gonna explode) low mph barely break traction kind of brake stand .
I read about one case where the poster found his tailshaft housing. Having had .025" wear and was out of round due to irregular wear from pinion angle issues and driveshaft whip (balance issue).
Still banging my head
Last edited by redsscamaroboy; Apr 22, 2017 at 09:25 PM.
TECH Enthusiast
Joined: Sep 2016
Posts: 518
Likes: 0
From: North Jersey
11 Second Club
Joined: Mar 2012
Posts: 1,541
Likes: 15
From: South Florida
Would be cool to see the video. So is the tail shaft pretty solid with minimal movement? I actually had an experience with a slip yoke/vibe issue. Installed a new driveshaft/yoke. right away felt a vibration. Checked angles. Found it was actually the slip yoke itself. Must have been a cheaper unit that had too much clearance between the splines. Installed a new Mark Williams slip yoke. Fit like a glove/no more vibrations. Hope you get it figured.
Would be cool to see the video. So is the tail shaft pretty solid with minimal movement? I actually had an experience with a slip yoke/vibe issue. Installed a new driveshaft/yoke. right away felt a vibration. Checked angles. Found it was actually the slip yoke itself. Must have been a cheaper unit that had too much clearance between the splines. Installed a new Mark Williams slip yoke. Fit like a glove/no more vibrations. Hope you get it figured.
On The Tree
Joined: Feb 2014
Posts: 135
Likes: 1
From: The City of Motors
That seems like a lot of play in that shaft. You said its the same driveshaft that didnt have vibrations before, but with the 4l80 there is a vibration, and there is a ton of play in the output shaft, so I would definitely be looking at the 4l80 being worn out. As to why the 4l80 is worn out, I dont know. Could be from improper driveline angle, or if the slip yoke is not playing nice with the output shaft etc.
FWIW, for my 4l80 swap I used the same yoke you listed from Dennys Driveshaft and it worked without issues at 128 mph on a stock foxbody driveshaft.
FWIW, for my 4l80 swap I used the same yoke you listed from Dennys Driveshaft and it worked without issues at 128 mph on a stock foxbody driveshaft.
That seems like a lot of play in that shaft. You said its the same driveshaft that didnt have vibrations before, but with the 4l80 there is a vibration, and there is a ton of play in the output shaft, so I would definitely be looking at the 4l80 being worn out. As to why the 4l80 is worn out, I dont know. Could be from improper driveline angle, or if the slip yoke is not playing nice with the output shaft etc.
FWIW, for my 4l80 swap I used the same yoke you listed from Dennys Driveshaft and it worked without issues at 128 mph on a stock foxbody driveshaft.
FWIW, for my 4l80 swap I used the same yoke you listed from Dennys Driveshaft and it worked without issues at 128 mph on a stock foxbody driveshaft.
I am planning on picking up the Dennys Driveshaft yoke listed and checking the pinion angle . After that I am in over my head with what's next .