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03-21-2020, 03:47 PM | #1 |
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Join Date: Aug 2013
Location: Navasota, TX
Posts: 708
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LS Swap Vibration at highway speeds
Hey guys, I swapped a LS 5.3 gen 3 with 4L60 BP engine harness in my 72 c10. Here is my issue. When I drive the truck from when it was sitting so the trans isn’t completely warmed up, drives like a dream, no vibration at 70-80. But when I have been driving for a while and all is warmed up (trans 185 / motor 210) and I stop and turn it off and fire it back up, I get a vibration at 60+ it seems. Has anyone ever had this before? Does that make sense? Been dealing with it since I did the swap. Supposed to be a rebuilt 4L60 so I am stumped. Any info would be greatly appreciated. Thanks! Neil
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Neil............... 1972 C10 SWB - Shop Truck in the Works 5.3 LS / Full Air Ride / Rear Notch 20" American Racing Daytonas IG - neilioustx - pictures of build/progress Born and Raised in the Promised Land.... TEXAS Y'ALL!! |
03-21-2020, 04:24 PM | #2 |
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Join Date: May 2015
Location: Alabama
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Re: LS Swap Vibration at highway speeds
When it starts vibrating, can you try slipping it in neutral ..if its possible ,while its still rolling..and see if it still vibrates?
Does sound odd it only does it when warm and after a recrank.
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03-21-2020, 04:35 PM | #3 |
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Join Date: Aug 2013
Location: Navasota, TX
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Re: LS Swap Vibration at highway speeds
Thanks for the advice, will definitely try that. Thanks!
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Neil............... 1972 C10 SWB - Shop Truck in the Works 5.3 LS / Full Air Ride / Rear Notch 20" American Racing Daytonas IG - neilioustx - pictures of build/progress Born and Raised in the Promised Land.... TEXAS Y'ALL!! |
03-21-2020, 11:13 PM | #4 |
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Join Date: Feb 2011
Location: Ogilvie Minnesota
Posts: 461
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Re: LS Swap Vibration at highway speeds
Could it be an engine misfire? I know its possible for an engine to run great and then develop a miss once warmed up. Maybe it's running on 7 once warmed up and creating a shake. Just a thought. Hopefully it's an easy fix.
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03-21-2020, 11:29 PM | #5 |
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Join Date: Feb 2011
Location: Ogilvie Minnesota
Posts: 461
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Re: LS Swap Vibration at highway speeds
One more thing. I have never had a vibration issue from the many 4l60e's I have owned but I did have shift solenoid issues in my s10 a few years ago. It was stuck in 3rd gear and I had to drop the pan to change the two shift solenoids. I realize that has nothing to do with your problem but maybe one of the other solenoids in the transmission is acting goofy. I have had hanger bearings cause a shake but that cant be it because those always happen at the same time and speeds.
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03-22-2020, 12:03 AM | #6 |
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Join Date: Aug 2013
Location: Navasota, TX
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Re: LS Swap Vibration at highway speeds
I have been thinking about getting it retuned. I had not thought of that being the issue, I will check it out. Thanks!
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Neil............... 1972 C10 SWB - Shop Truck in the Works 5.3 LS / Full Air Ride / Rear Notch 20" American Racing Daytonas IG - neilioustx - pictures of build/progress Born and Raised in the Promised Land.... TEXAS Y'ALL!! |
03-23-2020, 09:28 PM | #7 |
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Join Date: Jun 2016
Location: Phoenix AZ
Posts: 429
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Re: LS Swap Vibration at highway speeds
A bad torque converter can cause vibration.
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03-23-2020, 09:54 PM | #8 |
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Location: Ogilvie Minnesota
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Re: LS Swap Vibration at highway speeds
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03-23-2020, 10:35 PM | #9 |
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Join Date: Jun 2016
Location: Phoenix AZ
Posts: 429
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Did you ever clear the adaptive learning on the pcm for the transmission? I doubt it’ll fix this but I’m curious to know if it’s necessary or if it’ll cause any problems if you don’t.
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