Drivetrain 1988 mustang gt 5.0 rattling noise under acceleration


New Member
Jul 11, 2018
alamosa CO
hey guys i have a 88 fox with a 5.0 and when i have the pedal slammed to the floor in all the gears it has a rattle and i can feel it take power away until i feather the pedal a little bit (let off ) and then it goes away any suggestions? a pilot bearing? i have no clue where to start its a manual 5 speed by the way. any answers would be much appreciated. thanks
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General karthief

wonder how much it would cost to ship you a pair
Mod Dude
Aug 25, 2016
polk county florida
Lets eliminate the easy stuff first, but we need a little info to better help you, is the car stock or a few bolt ons? You would be surprised at the questions that have simple answers until there's the ' oh and it has a blower on it' revelation that will change everything.
what is the timing set at? Fuel pressure? Does it have the correct spark plugs, these are some of the things that will make it 'spark knock', you said it looses power when it 'rattles'. A hot engine will cause it to rattle and also a lean condition.
Oh, and always check for codes, that is the first step.


A little massaging and it went right in
Mod Dude
Feb 18, 2001
If you feel power loss associated with it, i'd assume detonation.

What octane fuel do you run and what is your base timing set to?