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Old 08-13-2011, 11:41 AM
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Brad750 Brad750 is offline
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Default Vibration in overdrive

I have a 97 4x4 with the 5.9, auto trans. When it shifts into OD it shudders and shakes like a standard would do if you took off in too high a gear. My question is, since this is my first Ram, is this a common Ram issue or is my trans just shot? I heard rumor from a guy at work that these trucks had an issue with the speed sensor that would cause my symptoms. He said when this goes bad the torque converter doesn't know when to lock up and constantly locks and unlocks.

Please help a guy out. Any troubleshooting advise is appreciated.
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Old 08-13-2011, 08:24 PM
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Quote:
Originally Posted by Brad750 View Post
I have a 97 4x4 with the 5.9, auto trans. When it shifts into OD it shudders and shakes like a standard would do if you took off in too high a gear. My question is, since this is my first Ram, is this a common Ram issue or is my trans just shot? I heard rumor from a guy at work that these trucks had an issue with the speed sensor that would cause my symptoms. He said when this goes bad the torque converter doesn't know when to lock up and constantly locks and unlocks.

Please help a guy out. Any troubleshooting advise is appreciated.
Well normally the automatic wouldn't take off in high gear, the kickdown band activates when WOT to prevent you from doing that and the reason is so you don't burn out your high gear.

All that out of the way yea sometimes a speed sensor will cause shift issues, now you know the OD shifts in and out frequently and that the OD in these transmissions are legend for burning out long before the transmission does however sometimes people are lucky for example I have been one of the lucky people.

The Converter locks up at 35MPH and that is also when the OD can be active so it's probably one of three things, the speed sensor, the Torque Converter, or the OD. Considering the age of the car usually electronics and their sensor are first to die so I would look into replace the sensor, oh just so you know have a pan a large one under the sensor for when you remove it because all the transmission fluid inside the transmission will escape. Note though if you have a speedo assembly be sure to replace the O-Ring on the assembly because it will leak like mine is doing and be sure that you properly index the speedo assembly based on the gears on the speedo pinion, index it to 6 o' clock position. Torque to 90-110 in/lbs. Anyways indexing is important because it won't register the proper speed.


Moving on, it could be that the OD is pretty worn out so it might have some vibrations just curious how many miles are on the transmission?
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Old 08-14-2011, 01:17 AM
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Very thorough response. Thank you. I guess I should have clarified that it does this at around 40mph and above. But you covered that senario also. I think I will try the speed sensor next week sometime and report back. Thanks again.

Edit: I forgot to add. The truck and motor has 211k but the seller told me the trans only has around 100k on it.
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Old 08-14-2011, 02:25 PM
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Originally Posted by Brad750 View Post
Very thorough response. Thank you. I guess I should have clarified that it does this at around 40mph and above. But you covered that senario also. I think I will try the speed sensor next week sometime and report back. Thanks again.

Edit: I forgot to add. The truck and motor has 211k but the seller told me the trans only has around 100k on it.

Also be sure to just check the TPS it has to do mainly when the shift to the next gear based on the throttle position.

If the transmission has that many miles well usually this is when the OD will begin to fail but only if the transmission isn't well taken care of.

So if you can find the time and money to atleast have the transmission flushed at a transmission shop I would have that done also you can use whatever fluid you want but I prefer to use Valvoline, it is very high grade and they just make great fluids I would trust my who car on them and as a matter fact I am, every fluid other than coolant and windshield washer is valvoline.
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