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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: tonyb on February 26, 2017, 10:43:47 am

Title: Full Time noise
Post by: tonyb on February 26, 2017, 10:43:47 am

Bought the 78 with a drivetrain noise, still doing it but it is starting to bother me. It is a 78 3/4 ton 350 Full time 4 wheel drive. noise is under power coming from somewhere up front or middle, Wheel bearings are good. Big money to fix? Any thoughts?

Title: Re: Fuul Time noise
Post by: gunrac on February 26, 2017, 11:09:40 am

Is it a whine, clicking, clunk, is there vibration?

Title: Re: Fuul Time noise
Post by: Irish_Alley on February 26, 2017, 11:31:09 am

could be a few things, could even be timing

Title: Re: Fuul Time noise
Post by: zieg85 on February 26, 2017, 11:34:21 am

First thought front axle u-joints, second thought is the slip yoke on the front drive shaft.  So many possibilities. 

Title: Re: Fuul Time noise
Post by: tonyb on February 26, 2017, 12:25:10 pm

Whine like wheel bearing but only under power and doesn't change when turning. Front differential?

Title: Re: Fuul Time noise
Post by: Irish_Alley on February 26, 2017, 02:08:48 pm

take front driveshaft out and lock the t case. unlock the front hubs or remove if auto and tape a bag over the hubs. this will isolate the front from the rear.

Title: Re: Fuul Time noise
Post by: tonyb on February 26, 2017, 05:57:35 pm

Thanks