roaring 4+4 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

vmax · 01-26-2003, 08:55 AM

hello,
have a `86 gmc 305 4+4 with a 700r4 tranny. my question is that when i get my truck up to 55 mph when it is in 4+4 there is a loud roaring sound and a vibration not a bad vibration but it is noticable.it has never done this before.it feels like something is out of balance with a roaring sound.any input will be great,thanks in advance,vmax

Blazer1970 · 01-26-2003, 04:10 PM

The first thing I would check is the slip joint in your front driveshaft. These tend to wear out fairly quickly, especially if they are not greased regularily. Grab the driveshaft at the slip joint and try to push it back and forth. If there is excessive play in the slip joint, you will have to have a driveline shop replace the joint/yoke.

01-26-2003, 08:55 AM	#1
vmax Registered User Join Date: Sep 2002 Location: michigan Posts: 25	roaring 4+4 hello, have a `86 gmc 305 4+4 with a 700r4 tranny. my question is that when i get my truck up to 55 mph when it is in 4+4 there is a loud roaring sound and a vibration not a bad vibration but it is noticable.it has never done this before.it feels like something is out of balance with a roaring sound.any input will be great,thanks in advance,vmax

01-26-2003, 04:10 PM	#2
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,507	The first thing I would check is the slip joint in your front driveshaft. These tend to wear out fairly quickly, especially if they are not greased regularily. Grab the driveshaft at the slip joint and try to push it back and forth. If there is excessive play in the slip joint, you will have to have a driveline shop replace the joint/yoke. __________________ Tim



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