Re: Driveshaft danger?
[Re: Cab_Burge]
#2257307
02/21/17 06:36 PM
02/21/17 06:36 PM
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Joined: Feb 2003
Posts: 21,318 Manitoba, Canada
DaytonaTurbo
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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 Came in here for this. Have you checked your pinion angle? You can exacerbate other driveline vibrations if your pinion angle is bad.
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Re: Driveshaft danger?
[Re: DaytonaTurbo]
#2257317
02/21/17 07:01 PM
02/21/17 07:01 PM
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Joined: Feb 2008
Posts: 992 Simi Valley, CA
MoparJ
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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 Came in here for this. Have you checked your pinion angle? You can exacerbate other driveline vibrations if your pinion angle is bad. Verifying that both yokes are parallel to each other today and if adjustments are needed.
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]
#2257397
02/21/17 09:30 PM
02/21/17 09:30 PM
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Joined: Feb 2008
Posts: 992 Simi Valley, CA
MoparJ
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Here you go boys. 1.5 inches exposed and the rest is engaged, which is 4.5 inches.
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]
#2257401
02/21/17 09:35 PM
02/21/17 09:35 PM
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Joined: May 2003
Posts: 6,570 Downtown Roebuck Ont
Twostick
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Still wishing...
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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. The drive shaft is now spinning about 1000 rpm faster with the 3.91 gear. The faster it spins, the harder it shakes. The shaft looks too short coupled with the fact that the shaft has some runout according to your machinist equals vibration. Kevin
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Re: Driveshaft danger?
[Re: MoparJ]
#2257402
02/21/17 09:36 PM
02/21/17 09:36 PM
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Joined: Jun 2005
Posts: 5,112 Western Md.
skicker
"The Champ"
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"The Champ"
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Grabbing at straws here but I had one in a pickup years ago that did what your describing after having new U-joints installed...and old mopar guy told me to "Spin the driveshaft half a turn" take it loose and spin it half a turn and reinstall. It worked....scratch my head to this day over that one... I'd say it's worth a try...
...FAFO...
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Re: Driveshaft danger?
[Re: MoparJ]
#2257428
02/21/17 10:29 PM
02/21/17 10:29 PM
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Joined: Sep 2014
Posts: 1,413 Central Pa
moparjim79
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Did you put poly mounts in the trans yoke as well? I am not sure what you are referring to. You mean the trans mount? if so, it is just a regular mount, not a poly. Sorry about that, yes the mount. I had the same exact deal going on in my car and never got it figured out. Someone said it was the pinion angle. The addition of the poly mount didn't help either in my case, but it was not a DD so I lived with it.
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Re: Driveshaft danger?
[Re: MoparJ]
#2257436
02/21/17 10:40 PM
02/21/17 10:40 PM
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Joined: Feb 2008
Posts: 992 Simi Valley, CA
MoparJ
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Once pushed all of the way in and backed out 1 inch, there is about .750" of slip yoke exposed, versus about 1.5" installed. There is currently 4.5 inches of slip yoke in the trans. The splines start about 1" in.
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]
#2257438
02/21/17 10:41 PM
02/21/17 10:41 PM
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Joined: Feb 2008
Posts: 992 Simi Valley, CA
MoparJ
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Measure the inside spline length I like to see from .750 to 1.0 yoke extension out of the tranny tailshaft housing from bottomed out with the car on the ground loaded ready to drive You have way more than that on yours The one picture of the front tranny yoke on the driveshaft, it looks like to me that the drive shaft is not centered in relation to the yoke center I'm sure it is not out of center due to if it was as bad as I see it you wouldn't be able to drive it over 20 MPH without the drive shaft breaking the output shaft and tail shaft housing on the tranny Nope, just a bad picture on my behalf. The angles really arent off that much at all and damn near parralel 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]
#2257446
02/21/17 10:57 PM
02/21/17 10:57 PM
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Joined: Feb 2003
Posts: 16,163 Mesa, Arizona
dart4forte
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I Live Here
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Just by chance when they were installing the u-joint maybe a couple needle bearings got buggered up? Just thinking out loud.
“So if it’s on the internet it must be true”
Abe Lincoln
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Re: Driveshaft danger?
[Re: dart4forte]
#2257487
02/21/17 11:48 PM
02/21/17 11:48 PM
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Joined: Feb 2008
Posts: 992 Simi Valley, CA
MoparJ
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Just by chance when they were installing the u-joint maybe a couple needle bearings got buggered up? Just thinking out loud. Well, I would ponder that as well, except I had the driveshaft balanced and u joints put on a month after the vibration began immediately after the gear change. The ujoints and rebalance actually took 80% of the vibration away to its current level.
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]
#2257627
02/22/17 04:46 AM
02/22/17 04:46 AM
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Joined: Feb 2008
Posts: 992 Simi Valley, CA
MoparJ
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If the DS is indeed a bit short and any minor vibes now exaggerated by the recent gear swap, is there any major risk of dropping the DS in the meantime while sourcing a new slightly longer 3 inch piece?
The splines in the tail of the trans are all in good shape still and 3.5 inches of the 4.5 inches of total slip yoke in the trans is in the splines. Slip yoke in total is 6 inches long.
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]
#2257697
02/22/17 12:01 PM
02/22/17 12:01 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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One other thing to consider is what RPM the drive shaft was balanced at.
You need a high speed balance.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Driveshaft danger?
[Re: MoparJ]
#2257720
02/22/17 12:43 PM
02/22/17 12:43 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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About to go away
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eyeballing your driveline angles is not valid
Measure them
come back when you have numbers
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Driveshaft danger?
[Re: MoparJ]
#2257734
02/22/17 01:20 PM
02/22/17 01:20 PM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
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First, get a driveshaft that's 3/4-1" longer.
Second, you said less of a vibration and more of a hum... any chance that you're getting exhaust resonance with the higher engine RPM while cruising?
**Photobucket sucks**
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Re: Driveshaft danger?
[Re: moparx]
#2257755
02/22/17 02:21 PM
02/22/17 02:21 PM
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Joined: Feb 2003
Posts: 16,163 Mesa, Arizona
dart4forte
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One other thing to consider is what RPM the drive shaft was balanced at.
You need a high speed balance. and most shops that do general driveshaft work for everything, [cars,trucks,big rigs] do NOT do high speed balancing. it seems that even though it costs a few dollars more, one might find a necessity to use a race type driveshaft company to insure the shaft is not only high speed balanced, but also to insure it has almost zero runout. Yes, high speed balance. Totally forgot that aspect. Might want to consider that. Isn't high speed balancing based on high rpm harmonics rather than sustained speed?
Last edited by dart4forte; 02/22/17 02:22 PM.
“So if it’s on the internet it must be true”
Abe Lincoln
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Re: Driveshaft danger?
[Re: Supercuda]
#2257766
02/22/17 03:08 PM
02/22/17 03:08 PM
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Joined: Feb 2008
Posts: 992 Simi Valley, CA
MoparJ
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eyeballing your driveline angles is not valid
Measure them
come back when you have numbers Yes, I plan to check the actual angle…once I source an angle finding tool this weekend.
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: 70Cuda383]
#2257767
02/22/17 03:09 PM
02/22/17 03:09 PM
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Joined: Feb 2008
Posts: 992 Simi Valley, CA
MoparJ
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First, get a driveshaft that's 3/4-1" longer.
Second, you said less of a vibration and more of a hum... any chance that you're getting exhaust resonance with the higher engine RPM while cruising? No, definitely not an exhaust drone.
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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