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Vibration problem #1241244 05/28/12 05:00 PM 05/28/12 05:00 PM
Joined: Feb 2005 Posts: 26 C challconv70 OP member
challconv70 OP member C Joined: Feb 2005 Posts: 26	I have a slight vibration at about 3300 RPM's, goes away at lower and higher RPM's, much worse in 4th gear, but present in other gears. Vibration is only present when foot is on the gas, under some load. Vibration has been there since car was restored. I am running a MP 402 Crate with A833. I had the driveshaft balanced which did not fix it, I am thinking either balancer or something on transmission input shaft since it is present in all gears and only under load. Any way to figure out before I start swapping parts?

Re: Vibration problem [Re: challconv70] #1241245 05/28/12 06:28 PM 05/28/12 06:28 PM
Joined: Jan 2003 Posts: 32,930 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,930 Grand Prairie,Texas	Have you checked pinion angle?

Re: Vibration problem [Re: stumpy] #1241246 05/28/12 06:34 PM 05/28/12 06:34 PM
Joined: Jan 2003 Posts: 29,652 Hamtramck, PA A Alaskan_TA Fluffy Balladeer
Alaskan_TA Fluffy Balladeer A Joined: Jan 2003 Posts: 29,652 Hamtramck, PA	Chrysler issued a technical service bulletin in 1973 for vibration diagnosis, it is 20 pages long. Go to http://www.hamtramck-historical.com/1974-Dodge-TSB-Index.shtml & drop down to Chapter 25 - see 25-02-74D

Re: Vibration problem [Re: challconv70] #1241247 05/28/12 07:04 PM 05/28/12 07:04 PM
Joined: Jan 2003 Posts: 75,008 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,008 U.S.S.A.	Quote: I have a slight vibration at about 3300 RPM's, goes away at lower and higher RPM's, much worse in 4th gear, but present in other gears. Vibration is only present when foot is on the gas, under some load. Vibration has been there since car was restored. I am running a MP 402 Crate with A833. I had the driveshaft balanced which did not fix it, I am thinking either balancer or something on transmission input shaft since it is present in all gears and only under load. Any way to figure out before I start swapping parts? Is the 402 crate also new with the resto ?

Re: Vibration problem [Re: JohnRR] #1241248 05/30/12 10:39 PM 05/30/12 10:39 PM
Joined: Feb 2005 Posts: 26 C challconv70 OP member
challconv70 OP member C Joined: Feb 2005 Posts: 26	Yes, vibe problem since 402 went in as well as other parts. Full resto.

Re: Vibration problem [Re: challconv70] #1241249 05/30/12 11:19 PM 05/30/12 11:19 PM
Joined: Jan 2003 Posts: 75,008 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,008 U.S.S.A.	Then look at the motor as the source of the vibration . Did you have the engine built ? Is it external balance ??

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