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10-21-2014 01:00 PM  4 years ago
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Rafael23cc

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Junction City, KS

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Automatic Transmission Question
I own a 2006 Dodge 1500 4wd. At the beginning of the summer it was shaking a little and I felt it shift hard a few times. So I changed the fluid, and inner filters. Vibration seem to go away. In the late summer the shakes came back, but this time it was time to change spark plugs and rotate tires. Got that done, and the shakes seemed to go away for a while. In the meantime i put in weekly trips from NE KS to SW OK. Now after a 1200 mile trip over two days, the shakes came back specially at around 65mph and 18-1900 rpms. The most notable thing is that while going downhill, the transmission shifted down as if I had de-activated the overdrive, and it would not shift given the speed.

Any ideas or suggestions appreciated.

Thanks
Rafael
Keep your feet on the ground, but your eyes on the sky.
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10-21-2014 01:49 PM  4 years ago
Lotus7

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Cape Town, South Africa

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Don't know much about auto shifters but also have a look at your tires - tread pattern run off, balance , alignment .
This will cause vibrations notable at certain speeds
Semi knobbly AWD tires are known culprits
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10-21-2014 03:02 PM  4 years ago
Rafael23cc

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Junction City, KS

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Thanks for the reply. That's the reason I rotated the tires just a few weeks ago. The vibrations primarily show at the speed and rpm stated, in addition to the hard shifting and down-hill oddities I'm looking towards the transmission and not the tires. The tires will be changed soon, hopefully before the first snow.

Thanks
Rafael
Keep your feet on the ground, but your eyes on the sky.
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10-21-2014 03:27 PM  4 years ago
xcellgasman101

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WOODWARD, OKLA....

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Check your U-Joints in the drive lines,, this will cause a vib at certain speeds, and RPM's,,, Front and back drive lines on 4WD pickups,, Hope this helps,, XGM/VGM

To check you drive lines, crawl under there and grab the drive line, and try to move it in all directions,, Its shouldn't move at all except in and out maybe,, If you find play,, then the U-Joints are bad, and need replaced,,

My 2012 Dodge 1500 Pickup 4WD will down shift if going down a hill and I let off the gas, or in cruz mode, it will down shift to keep from building up more speed, It does it more, if you are in Tow/Haul mode also,, XGM/VGM
John Crotts
www.soonerhelicamproductions.com
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10-21-2014 03:35 PM  4 years ago
junkpilot

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Alamogordo N.M.

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Shaking at certain speds
It is not typical for transmissions to cause a shake however driveshafts sometimes do at lower speeds due to seized u-joints or bad supports. I also agree about tires, You could check this by shifting to a lower gear while cruising in the shake zone and see if the shake remains. If the shake is still there then it is probably one or more tires out of balance. Big oversized tires are hard to balance properly.
Junkpilot
When you fly JUNK it's hard to tell when you've crashed!
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10-21-2014 03:42 PM  4 years ago
kirk

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Northern, Colorado

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I agree with John "Check your U-Joints"

I have had the same issue you are describing on two different 4x4's and in both situations it ended up being a bad u-joint. If the test that John suggested does not locate a bad one I would disconnect each one and make sure it moves correctly. I had one on a Yukon that felt fine until I unhooked it. Found that the needle bearing in the end cap had no grease in them which caused the u-joint to bind up...

Kirk
Proud to have over 13 pages of Good Guy feedback.
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10-21-2014 04:00 PM  4 years ago
Rafael23cc

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Junction City, KS

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Thanks for all the replies.

My truck has an overdrive setting and a Tow/Haul setting. I was not using them at the time when going downhill. I see where the truck could have done it by itself to maintain speed as I was using the cruise control at the time. It did put a dent on the gas mileage tho.

I will take a look at the drive joints as suggested. A lot easier on the wallet than a transmission job. But what about the hard shifts? They mostly happen at slower speeds in town.

Thanks again
Rafael
Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com
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10-21-2014 04:58 PM  4 years ago
BONO1

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AR

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Trans
Years ago I had one doing about the same and it was the converter which exploded and required a complete rebuild. I would get it checked by a trans shop. It sounds like a torque converter problem to me which can go from bad to worse quickly if it explodes and sends metal though the trans.

Sam
blow smoke
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10-21-2014 06:13 PM  4 years ago
adamsz06

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Geilenkirchen Germany

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My 98 1500 4x4 had the exact same vibration...at 65mph, I could literally watch the 4wd lever dance forward and backward in the shift boot. Transmission had 200,000 miles on it and was beginning to hunt at part throttle shifts, so I had one built with 48re internals that could stand up to the 36" tires on the truck. While the transmission was out, I rebuilt the transfer case and installed new u-joints. Much to my surprise, on the first drive with the new trans, the shake was still there at 65mph...kind of a "whomp, whomp, whomp" like you'd get with a tire that had a broken belt. Long story short, when shaking the rear driveshaft, I had mistaken the up and down play at the rear differential for the u-joint. Had I looked closer, the movement was coming from the pinion bore behind the yoke. This up and down movement, combined with the excess backlash from a ring and pinion set that had over 200k on it was causing the pinion to constantly climb the ring gear under load, which also caused some driveline vibes. Had to replace the rear axle because the pinion bore was ruined, but it allowed me to swap in gearing that could handle the big tires better.R.I.P. Roman
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10-22-2014 01:58 AM  4 years ago
ROGER543

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bristol ct usa

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check to see if you have a driveshaft center support bearings they only last about 80,000 miles. its the rubber around the bearings that gets soft over time and eventually takes out your u-joints
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10-22-2014 03:32 AM  4 years ago
Mahu

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Panhandle , FL

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My Yota had a new drive shaft center support bearing and 3 U-Joints installed last week and all vibrations have stopped and it rides like a caddie again.

$500+ down now. :-(
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10-22-2014 03:24 PM  4 years ago
Rafael23cc

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Junction City, KS

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Thanks for all the input. Greatly appreciated.

Now to schedule a shop stop on my work truck.

Rafael
Keep your feet on the ground, but your eyes on the sky.
Team Heliproz.com
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