Mercury Cougar rear 9'' diff - Engine Troubleshooting


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Mercury Cougar rear 9'' diff

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dave 1967
Novice

Mar 11, 2009, 6:39 PM

Post #1 of 4 (1112 views)

Mercury Cougar rear 9'' diff	Sign In

Year of vehicle-1967
Make of vehicle-mercury
Model of vehicle-cougar
Engine size-390 V8

9 inch ford pinion loose and has vibration at cruisin speed What do I look for. U joints have been changed.

Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Mar 11, 2009, 6:49 PM

Post #2 of 4 (1111 views)

Re: Mercury Cougar rear 9'' diff	Sign In

Dave; If this vibration is at a steady speed, recheck the u-joints. You may have to get the driveshaft re-balanced, especially if the old joints did any damage to the yokes. (and that's no yoke) If you can actually feel play in the pinion, then you're going to have to have the differential looked at. If this vibration is on decel, more than likely it will be a u-joint problem. Just because you don't feel play in a joint doesn't mean it's okay. I could be bound up. You'll need to remove the shaft and feel the joints to see if they move freely, both directions.
Loren
SW Washington

dave 1967
Novice

Mar 12, 2009, 5:50 PM

Post #3 of 4 (1107 views)

Re: Mercury Cougar rear 9'' diff	Sign In

loren: the vibration doesn't do it when i excel or decel Just when there no load at or above 60kms. I did what you said and removed the drive shaft and checked it out. The u joints moved not to bad, not super loose but with a little tension is that ok? I also grabbed the pinion shaft this time with the drive shaft off and it still moves Quite a bit.

Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Mar 13, 2009, 3:40 PM

Post #4 of 4 (1095 views)

Re: Mercury Cougar rear 9'' diff	Sign In

Yes, a little tension is okay; What you are feeling for is any roughness or binding when you move them all directions. If you feel ANY, it's bad. Are we 100% sure this vibration is coming from the drivetrain? 60kms is about 40mph? I wouldn't think that's fast enough to be a wheel balance problem. Check the tires, themselves, for any 'bubbles' or abnomalities in the tread (broken belts).
Loren
SW Washington

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