Re: Driveshaft danger?
[Re: RapidRobert]
#2256880
02/20/17 11:03 PM
02/20/17 11:03 PM
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Joined: Feb 2008
Posts: 992 Simi Valley, CA
MoparJ
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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.
Searching for new A or B Body Project!
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Re: Driveshaft danger?
[Re: Cab_Burge]
#2256908
02/21/17 12:02 AM
02/21/17 12:02 AM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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There should not be any movement with the driveshaft installed in the car , no up or down and no side to side movement, EVER It should rotate smoothly in a straight plane, no wobbling Wobbling(up or down or side to side) makes vibrations, straight and true do not 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.
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Re: Driveshaft danger?
[Re: Kern Dog]
#2256914
02/21/17 12:12 AM
02/21/17 12:12 AM
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Joined: Feb 2008
Posts: 992 Simi Valley, CA
MoparJ
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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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Re: Driveshaft danger?
[Re: MoparJ]
#2256919
02/21/17 12:20 AM
02/21/17 12:20 AM
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Joined: Aug 2003
Posts: 43,852 Bend,OR USA
Cab_Burge
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I Win
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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 ) and check your pinion and driveshaft angles with the car on the suspension like it driven 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 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
Last edited by Cab_Burge; 02/21/17 12:22 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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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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Joined: Feb 2008
Posts: 992 Simi Valley, CA
MoparJ
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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!
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Re: Driveshaft danger?
[Re: MoparJ]
#2256931
02/21/17 12:42 AM
02/21/17 12:42 AM
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Joined: Feb 2008
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MoparJ
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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.
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.
Searching for new A or B Body Project!
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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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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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Circle Track
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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.
live every 24 hour block of time like it's your last day on earth
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Re: Driveshaft danger?
[Re: Kern Dog]
#2256958
02/21/17 01:38 AM
02/21/17 01:38 AM
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MoparJ
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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. 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.
Searching for new A or B Body Project!
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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
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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. 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!
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Re: Driveshaft danger?
[Re: gold66cuda]
#2256986
02/21/17 02:17 AM
02/21/17 02:17 AM
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MoparJ
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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!
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Re: Driveshaft danger?
[Re: MoparJ]
#2256996
02/21/17 02:51 AM
02/21/17 02:51 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
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nothing was changed that would move the housing a tad rearward?
live every 24 hour block of time like it's your last day on earth
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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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Joined: Feb 2008
Posts: 992 Simi Valley, CA
MoparJ
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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!
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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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Joined: Feb 2008
Posts: 992 Simi Valley, CA
MoparJ
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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. 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!
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Re: Driveshaft danger?
[Re: MoparJ]
#2257159
02/21/17 02:07 PM
02/21/17 02:07 PM
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Joined: Mar 2007
Posts: 3,298 West Coast, USA
jbc426
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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. 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.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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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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Joined: Jan 2004
Posts: 8,778 fredericksburg,va
cudaman1969
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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.
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Re: Driveshaft danger?
[Re: cudaman1969]
#2257295
02/21/17 06:25 PM
02/21/17 06:25 PM
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Joined: Feb 2008
Posts: 992 Simi Valley, CA
MoparJ
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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. 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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