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Re: Driveshaft danger? [Re: RapidRobert] #2256880
02/20/17 11:03 PM
02/20/17 11:03 PM
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Simi Valley, CA
MoparJ Offline OP
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Originally Posted By RapidRobert
I missed that it ain't an 8&3/4. do keep us updated.


I will. Going to take some pictures of the driveshaft and post in a few hours.

If it ends up being in the rear gears from the install, I might just have to deal with it for a while. The axle bearings and all components were reused from a rebuild and add of a limited slip about 6000 miles/2 years ago..


2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.

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Re: Driveshaft danger? [Re: MoparJ] #2256885
02/20/17 11:15 PM
02/20/17 11:15 PM
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Harriman NY
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Maybe the gears/carrier & bearings just didn't take a good set this time,could be somethings off there.

Re: Driveshaft danger? [Re: Cab_Burge] #2256908
02/21/17 12:02 AM
02/21/17 12:02 AM
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Granite Bay CA
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Originally Posted By Cab_Burge
There should not be any movement with the driveshaft installed in the car , no up or down and no side to side movement, EVER tsk It should rotate smoothly in a straight plane, no wobbling tsk
Wobbling(up or down or side to side) makes vibrations, straight and true do not work


I agree in theory but every driveshaft that I can recall had some slight play at the trans. The splines are not an interference fit, they do slide as they rotate.
My Charger has the best collection of parts of the cars that I own and even it has a small degree of slop. Zero drone, zero vibrations other than the engine.

Re: Driveshaft danger? [Re: Kern Dog] #2256914
02/21/17 12:12 AM
02/21/17 12:12 AM
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Simi Valley, CA
MoparJ Offline OP
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Here are a few photos. After checking front snout slop again, there really isn't any movement. I'll try and post a video.

20170220_180048.jpg
Here are some pics. Just checked slop again at front. Really non existent.

20170220_180048.jpg20170220_180351.jpg

2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.

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Re: Driveshaft danger? [Re: MoparJ] #2256919
02/21/17 12:20 AM
02/21/17 12:20 AM
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Do you have a angle finder, compass?
If so measure the pinion angle and driveshaft angle and let us know what you find yours are, if you don't have one or can't borrow one go get one (beg, borrow or steal one devil) and check your pinion and driveshaft angles with the car on the suspension like it driven scope
In the sideways pictures of your driveshaft and pinion U joint is the rear end on jack stands or is the rear end hanging down on the cars rear suspensions?
Me thinks your driveshaft is to short shruggy The yoke needs to be in more when the car is on the suspension, so if it is not on the suspension in your pictures ignore this comment up

Last edited by Cab_Burge; 02/21/17 12:22 AM.

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Re: Driveshaft danger? [Re: MoparJ] #2256922
02/21/17 12:27 AM
02/21/17 12:27 AM
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Simi Valley, CA
MoparJ Offline OP
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No sir, not on the rear tires. On jack stands with the rear suspension relaxed and jack lowered.


2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.

Searching for new A or B Body Project!
Re: Driveshaft danger? [Re: MoparJ] #2256931
02/21/17 12:42 AM
02/21/17 12:42 AM
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MoparJ Offline OP
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Here are pics of front and rear yokes, perfectly level and camera level, with rear on ground. Rear yoke might be at ever so slight steeper angle than front, but is very miniscule. I'll try to properly get the reading though...

Edit: pic of rear yoke is off a bit. Really at same angle as front.

20170220_183429.jpg20170220_183355.jpg
Last edited by MoparJ; 02/21/17 12:43 AM.

2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.

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Re: Driveshaft danger? [Re: MoparJ] #2256937
02/21/17 12:50 AM
02/21/17 12:50 AM
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RapidRobert Offline
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the first thing I would do right now is pull the rear ujoint caps & move the shaft all the way forward & measure the distance back to where the caps seat in the yoke.


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Re: Driveshaft danger? [Re: MoparJ] #2256938
02/21/17 12:54 AM
02/21/17 12:54 AM
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Granite Bay CA
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I wonder of I am seeing it right. It appears that the yokes are not in alignment. They have to be within a few degrees of each other to avoid vibration. The u-joint connection speeds up and slows down at every rotation. I'd expect trouble if the u-joints didn't both do this at the same time every rotation.

Re: Driveshaft danger? [Re: Kern Dog] #2256958
02/21/17 01:38 AM
02/21/17 01:38 AM
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Simi Valley, CA
MoparJ Offline OP
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Originally Posted By Frankenduster
I wonder of I am seeing it right. It appears that the yokes are not in alignment. They have to be within a few degrees of each other to avoid vibration. The u-joint connection speeds up and slows down at every rotation. I'd expect trouble if the u-joints didn't both do this at the same time every rotation.


That picture of the rear didn't come out right; the camera is tilted a bit. If angled the right way, the tires are level with the ground.


2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.

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Re: Driveshaft danger? [Re: RapidRobert] #2256966
02/21/17 01:49 AM
02/21/17 01:49 AM
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MoparJ Offline OP
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Originally Posted By RapidRobert
the first thing I would do right now is pull the rear ujoint caps & move the shaft all the way forward & measure the distance back to where the caps seat in the yoke.


I will check that out. About 1.75" exposed of snout and no less than 5/8 of snout is engaged in trans.


2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.

Searching for new A or B Body Project!
Re: Driveshaft danger? [Re: MoparJ] #2256969
02/21/17 01:50 AM
02/21/17 01:50 AM
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If the car is on the ground in the last set of pictures the driveshaft is about an 1" short.

Re: Driveshaft danger? [Re: gold66cuda] #2256986
02/21/17 02:17 AM
02/21/17 02:17 AM
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Simi Valley, CA
MoparJ Offline OP
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Originally Posted By gold66cuda
If the car is on the ground in the last set of pictures the driveshaft is about an 1" short.


The car is on the ground. Yes, the driveshaft could be a tad short, but I am not grasping why it's now an issue when it wasn't prior to the gear swap.


2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.

Searching for new A or B Body Project!
Re: Driveshaft danger? [Re: MoparJ] #2256996
02/21/17 02:51 AM
02/21/17 02:51 AM
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nothing was changed that would move the housing a tad rearward?


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Re: Driveshaft danger? [Re: MoparJ] #2256998
02/21/17 03:02 AM
02/21/17 03:02 AM
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MoparJ Offline OP
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Not since the gear change. Motor mounts done a month before the trans swap, which was a year ago.


2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.

Searching for new A or B Body Project!
Re: Driveshaft danger? [Re: MoparJ] #2257094
02/21/17 12:11 PM
02/21/17 12:11 PM
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Can you verify both U joints are in line on the driveshaft? The driveshaft looks to me to be too short...If it's not into the tail shaft bushing far enough it does wobble and will cause a vibration. The splines and the tail shaft do not control the yoke as much as the bushing in the tail shaft housing does. twocents


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Re: Driveshaft danger? [Re: skicker] #2257099
02/21/17 12:17 PM
02/21/17 12:17 PM
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Simi Valley, CA
MoparJ Offline OP
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Originally Posted By skicker
Can you verify both U joints are in line on the driveshaft? The driveshaft looks to me to be too short...If it's not into the tail shaft bushing far enough it does wobble and will cause a vibration. The splines and the tail shaft do not control the yoke as much as the bushing in the tail shaft housing does. twocents


Yes, both u joints are in line with each other.


2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.

Searching for new A or B Body Project!
Re: Driveshaft danger? [Re: MoparJ] #2257159
02/21/17 02:07 PM
02/21/17 02:07 PM
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Originally Posted By MoparJ
Originally Posted By RapidRobert
the first thing I would do right now is pull the rear ujoint caps & move the shaft all the way forward & measure the distance back to where the caps seat in the yoke.


I will check that out. About 1.75" exposed of snout and no less than 5/8 of snout is engaged in trans.


I was told you want the driveshaft to be able to slide 1" forward before it bottoms out in the trans.

There is a tool available to R&R the rear trans bushing without pulling the trans. It cost about $150. I bought one and did mine chasing a similar high speed vibration. I have yet to find it, and it only occurs above 95mph.


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Re: Driveshaft danger? [Re: MoparJ] #2257221
02/21/17 04:15 PM
02/21/17 04:15 PM
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Where the rear pinion bearings changed? Maybe that front pinion bearing is bad, nut tight? That might be the place to check since the "noise" came after the gear change. I thought I read you replaced it all at the same time.
Also since you had to change front slip yoke, is it bent? Have to watch it turn running in gear. Only way to check the driveshaft for harmonics is to try another one.

Last edited by cudaman1969; 02/21/17 04:21 PM.
Re: Driveshaft danger? [Re: cudaman1969] #2257295
02/21/17 06:25 PM
02/21/17 06:25 PM
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MoparJ Offline OP
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Originally Posted By cudaman1969
Where the rear pinion bearings changed? Maybe that front pinion bearing is bad, nut tight? That might be the place to check since the "noise" came after the gear change. I thought I read you replaced it all at the same time.
Also since you had to change front slip yoke, is it bent? Have to watch it turn running in gear. Only way to check the driveshaft for harmonics is to try another one.




No, nothing was changed when the gears were changed to 3.91 recently. Everything was replaced in the rear a year prior when the sure grip unit was installed with the 3.21 gears previously, so nothing was touched this past time around.

The front slip yoke was sourced and put on the front of the driveshaft back when the 4 speed was put in early last year. Nothing appears bent and it all functioned without issue with the 4 speed/3.21 combom before going to the 3.91 gears.

My dad is checking for engagement of the driveshaft into the trans today while I am at work, making sure that the driveshaft isn’t backed out more than .750-1.000” after pushing it in as far as it will go. Will report those results later.


2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.

Searching for new A or B Body Project!
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