drivetrain mounts

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Jan 3, 2015 | 03:00 PM

jaltman1984

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drivetrain mounts

I've got a 1988 F 150 4 wheel drive 4.9 5 speed.when I'm spinning the rear tires and they grab traction the whole truck shakes and starts bucking, the shifter go side to side 5 to 6 inches.and when I say shakes its violent.I've had several of these trucks and this is the fort to do it . I thought it was either motor mounts or tranny mounts but I've checked them and they appear fine .. what gives.?

Jan 3, 2015 | 03:29 PM

Conanski

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From: Ottawa, Ontario

How many leafs in the rear suspension and are any of them cracked? Is the truck stock or lifted? If the truck has 2.5" wide springs or only the 3 leaf pack they're much too soft and are allowing the axle to wrap, solutions include adding more leafs or traction bars.

Jan 3, 2015 | 05:16 PM

jaltman1984

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.the rear end doesn't move in the main issues the 4 wheel drive shifter in the gear shifter going side to side when the tires rotate when traction is broke

Jan 3, 2015 | 05:58 PM

rugermack

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From: Sonoita Hills, AZ

Sounds like motor/tranny mounts, if nothing else is broken.

Jan 3, 2015 | 08:16 PM

xrsfsho

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From: san jose

Motor mounts would be my first guess. Then i would go with the wheel hop or axle wrap. Open diff? I would second traction bars

Jan 4, 2015 | 11:14 AM

'89F2urd

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if your shifter is goin all over the place, its likely your engine mounts are bad. expect your trans mount to be destroyed too. pretty easy to test them; in layman terms, get under there and push on stuff.

Jan 4, 2015 | 12:15 PM

Mattjmulligan

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My truck does the same, has a broken motor mount and a tranny mount on it's way out the 4.9 is known for shredding motor mounts. Something about them being to soft I beleive