Lately, now that I have sold my other truck and need the F100 as a DD, there's a knocking sound coming from the back of the truck in gear while the brakes are pushed ( at a stoplight) and you can feel it sometimes in the brake pedal. Once the truck gets over 5mph it stops. My axle seal on the passenger side is still leaking so I thought it might be low on fluid. Yesterday I topped off the axle oil and it continues. What could the sound be coming from? U joints, brakes, axle, or something loose?
Thanks
Knocking Sound
Moderator: FORDification
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Subzero
- Blue Oval Fan
- Posts: 734
- Joined: Sat Mar 23, 2013 8:02 pm
- Location: Hampton Roads, Virginia
Knocking Sound
1972 F100 Sport Custom-2WD, Aqua Blue and Wimbleton White, LWB, 302 V8 and C4 trans, P/S, P/B - under construction
Gone but not forgotten: 1968 F100 Ranger- 2WD, LWB, original rebuilt 360 V8, Autolite 2bbl carb, C6 Trans, Hedman Headers, Powermaster Racing Starter, H-Pipe and Glasspacks, P/S, P/B, A/C
Gone but not forgotten: 1968 F100 Ranger- 2WD, LWB, original rebuilt 360 V8, Autolite 2bbl carb, C6 Trans, Hedman Headers, Powermaster Racing Starter, H-Pipe and Glasspacks, P/S, P/B, A/C
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70shortwide
Re: Knocking Sound
Sounds like your exhaust is hitting the frame/axle/body somewhere. get under there and follow the exhaust back and see if it wiggles enough to hit something...
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thejunkman
- Preferred User
- Posts: 254
- Joined: Mon Jul 15, 2013 8:14 pm
- Location: Southwestern PA
Re: Knocking Sound
If I were you I would get that axle seal fixed ASAP. It doesn't cost a lot, and you are going to ruin your brakes, risk messing up your rear end, and on top of that it makes it hard to troubleshoot things when you have a known problem. It also is a safety hazard. With these old brake systems you want as much brake as you can get.
-Dave
1967 f100 long bed 2wd, 390, np435
1999 Mercury Grand Marquis
1967 f100 long bed 2wd, 390, np435
1999 Mercury Grand Marquis