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Old 10-27-2010, 07:27 AM
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truck shaking in 4th gear?

Hello, I have a 78 400m when I shift into 4th gear the truck kinda shakes in the motor. especially underload. 1st and 2nd gear no problem but when I get into 3rd going into 4th the shaking starts. It only happens when I first go into the gear after that it smooths out. Kinda fells like when you shift into a gear to early then smooths out. Thanks for the help

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Old 10-27-2010, 05:10 PM
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check your motor mounts and transmission tail mount at the cross member.
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Old 10-27-2010, 05:16 PM
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Could be the clutch/pressure plate also.

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