Front end bounce - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 06-17-2012, 09:09 AM Thread Starter
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Front end bounce

Like the title says i have a front end bounce that starts at about 43 mph and goes away at about 48 mph. Sometimes it does it and sometimes it doesnt. I just returned from a deployment and installed a procomp 2 inch leveling kit, with new leaf spring packs on the front and shocks all the way around. New ball joints, tie rod ends, brake pads. I also got new tires. 305/70/16 Toyo open country M/ts. Remedies ive tried so far are: Ive had all four wheels rebalanced and rotated three times and aligned twice. Any help or suggestions would be greatly appreciated. Thanks.

2002 F-250 CCSB
4x4
DIY intake
4" MBRP turbo-back straight pipe
zoodad mod
foil delete mod
super springs rear
Procomp 2inch leveling kit
305/70/16 Toyo M/T's
Wicked Wheel
Turbomaster wastegate controller
Dieselsite I/C boots
ELC Coolant
Dieselsite Coolant filter
Dieselsite 203* thermostat and housing
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post #2 of 11 Old 06-17-2012, 10:11 AM
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Try messing with tire pressures... up 10psi or down 10 psi. See if that helps. If not jack up the truck and spin the wheel by hand. See if it looks round. Worst case could be a defective tire(bubble or separation) Most tire monkeys won't notice a defective tire. They'll just balance it again. Also is there an excessive amount of balance weight on one wheel compared to the other 3?

When is the last time you serviced the wheel bearings? How do the balljoints look in the steering knuckles? Could also be a mild case of death wobble since it is intermittent....


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post #3 of 11 Old 06-18-2012, 12:17 PM
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Is it while you hit the brakes or not? Mine bounces pretty bad while going over large bumps or stopping. Having such a long truck makes it difficult to not bounce when slowing down. Things like warped rotors or bad shocks can cause this. Mine is because the rotors are bad and I have the leveling kit with the leaf springs. Ford switched to coils in the front to help solve this bouncing issue. Hope this helps

2002 CCLB F350 7.3L 4x4 Lariat. Black with 2007 Tan leather interior. Mild towing tune, K&N CAI with sleeve, MBRP 4" exhaust straight pipe.
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post #4 of 11 Old 06-19-2012, 05:42 AM Thread Starter
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If i go up past the 45 mph range and hit the brakes it will bounce as its decelerating but only through that range. I'm thinking either defective tires, or a defective shock. It doesnt matter which of the four tires i put up front it will still bounce. Is very frustrating.

2002 F-250 CCSB
4x4
DIY intake
4" MBRP turbo-back straight pipe
zoodad mod
foil delete mod
super springs rear
Procomp 2inch leveling kit
305/70/16 Toyo M/T's
Wicked Wheel
Turbomaster wastegate controller
Dieselsite I/C boots
ELC Coolant
Dieselsite Coolant filter
Dieselsite 203* thermostat and housing
International bellowed up-pipes
Recon smoked tail lights
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post #5 of 11 Old 06-19-2012, 05:50 AM
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itfire344, i know you indicated you changed ball joints and tie rod ends but what you are describing sure does sound like bad tie rods. What about the Link rod that attaches to the pitman arm? Also, do you have any slack in your steering wheel? Maybe the gear box has some slack or play and is contributing to the bounce. but i do agree that bad shocks could be the issue as well.

2002 F250 Super Duty 7.3L XLT Crew Cab 2WD
6637 DIY Air Intake
ISSPRO Gauges on Tripple A-Pillar Pod
Fabtech 6" Suspension Lift
18"x9" XD Rockstars W/35"x12.5" Toyo Open Country
Amp Research Powered Steps
Replaced Batteries, Starter and Waterpump
Zerex EC-1 Coolant
Sprayed Herculiner to Front Grill and Bumper
------ Other Mods coming soon -------
Phoenix PHP 6 Position Chip
4" Exhaust System
SD66 Turbo
Larger Injectors - Either Stage1 160s or Hybrids
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post #6 of 11 Old 06-19-2012, 05:54 AM Thread Starter
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Bad tie rods would cause a front end to bounce? The link rod that attaches to the pitman arm was not replaced. There is some slack in the steering wheel, but still educate me on how that would contribute to the bounce. If it is the shocks how do i go about proving that there defective shocks so that i can get them replaced under warranty? Thanks for the help.

2002 F-250 CCSB
4x4
DIY intake
4" MBRP turbo-back straight pipe
zoodad mod
foil delete mod
super springs rear
Procomp 2inch leveling kit
305/70/16 Toyo M/T's
Wicked Wheel
Turbomaster wastegate controller
Dieselsite I/C boots
ELC Coolant
Dieselsite Coolant filter
Dieselsite 203* thermostat and housing
International bellowed up-pipes
Recon smoked tail lights
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post #7 of 11 Old 06-19-2012, 06:03 AM
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Is it a distinct bounce or possibly some vibration? Check u-joints

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post #8 of 11 Old 06-19-2012, 06:30 AM Thread Starter
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Quote:
Originally Posted by atvrider93 View Post
Is it a distinct bounce or possibly some vibration? Check u-joints
Its definetly a distinct bounceing, and not a vibration. Starts at about 43ish and is gone at about 48ish. Sometimes it does it and sometimes it doesnt. It does it more times than not though.

2002 F-250 CCSB
4x4
DIY intake
4" MBRP turbo-back straight pipe
zoodad mod
foil delete mod
super springs rear
Procomp 2inch leveling kit
305/70/16 Toyo M/T's
Wicked Wheel
Turbomaster wastegate controller
Dieselsite I/C boots
ELC Coolant
Dieselsite Coolant filter
Dieselsite 203* thermostat and housing
International bellowed up-pipes
Recon smoked tail lights
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post #9 of 11 Old 06-19-2012, 10:23 AM
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The only way you can tell a shock is bad is by looking at it and seeing if it is leaking. Otherwise it could just be cheap shocks or stiff shocks. I have the rancho shocks and they bounce like that. Not too much you can do unless you buy nice shocks.

2002 CCLB F350 7.3L 4x4 Lariat. Black with 2007 Tan leather interior. Mild towing tune, K&N CAI with sleeve, MBRP 4" exhaust straight pipe.
Kettering University off road diesel enthusiast
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post #10 of 11 Old 06-19-2012, 02:09 PM
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Quote:
Originally Posted by ltfire344 View Post
Bad tie rods would cause a front end to bounce? The link rod that attaches to the pitman arm was not replaced. There is some slack in the steering wheel, but still educate me on how that would contribute to the bounce. If it is the shocks how do i go about proving that there defective shocks so that i can get them replaced under warranty? Thanks for the help.
Yes, bad tie rods will definitely cause the bounce in the speed range you describe. My 02 started out as a small bounce as when decelerating in speed range of 35 to 45ish and progressively got worse to the point where it was bouncing more pronounced on both accel and decel. I changed all the tie rods, ball joints and link rod connecting to the pitman arm including the pitman because i install a lift. I also changed out the shocks. I no longer have the bounce.

As others have suggested the only way to tell if shocks are bad is to see if you have fluid leaking from them. Otherwize they could just be cheaper shocks that can't support the weight of the front end like stronger heavy duty shocks. In fact i am in the process of changing the shocks that came with my lift, i just dont like the way the ride going with some heavy duty Bilstein 5100 shocks. Hope this helps

2002 F250 Super Duty 7.3L XLT Crew Cab 2WD
6637 DIY Air Intake
ISSPRO Gauges on Tripple A-Pillar Pod
Fabtech 6" Suspension Lift
18"x9" XD Rockstars W/35"x12.5" Toyo Open Country
Amp Research Powered Steps
Replaced Batteries, Starter and Waterpump
Zerex EC-1 Coolant
Sprayed Herculiner to Front Grill and Bumper
------ Other Mods coming soon -------
Phoenix PHP 6 Position Chip
4" Exhaust System
SD66 Turbo
Larger Injectors - Either Stage1 160s or Hybrids
Hutch n' harpoon Mod
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