Got a rumble in the driveline

Discussion in 'Mack Forum' started by chalupa, May 9, 2012.

May 9, 2012 #1

chalupa Road Train Member

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Jul 22, 2010

Houston,Texas

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My Mach Ch has got a rumble in the driveline. It has a E-7 / 9 speed and Rockwell 3.90's

Has rebuilt tranny, yoke, u-joint and carrier bearing. Still there. No play in push up test of driveline, all good.

Rumble fades in around 1500 and stays to 1625 and fades away. Gets louder if you add fuel / pull. Let off and it quiets down. Very quiet at 75 mph and 1800 rpm.

Has new rear motor mounts too. (8) Where do I look next ? I suspect ride height but I dunno. Bags are set just like 2 other dogs on yard with same package / year .

chalupa, May 9, 2012

chalupa, May 9, 2012

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