Compression Ignition Addict
Join Date: Jan 2008
Location: Covina CA
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Hopping under acceleration
Going to be a kinda of a long story so i can get all the details out in one post, sorry.
Early 99 7.3, stacked lift blocks, factory driveshaft, stock gears, 35" tires, 6spd manual trans, 110k miles
I regularly tow my toyota pickup play truck to and from the desert. Not a heavy load, about 6k lbs with the trailer. Everything has been 100% fine until the last trip. The drive to the desert (100 miles) was a night mare due to traffic, constant stop and go traffic the entire drive made the trip take about 3.5 hrs but everything felt normal other then my sore leg from the clutch. Truck felt entirely normal when i parked it in the desert and didnt touch it for 3 days. Loaded up to head home and got directly on the freeway and set the cruise control at 60. About 30 miles later i decided to stop for lunch. I came to a stop at the top of a fairly steep uphill offramp. when i tryed to accelerate there was a VERY significant hopping, bad enough that i stalled the truck. restarted it and tried to go again and the hopping was still very bad but was ONLY there while i was slipping the clutch. Parked at a restaurant and noticed the u-joint at the pumpkin was pretty sloppy so i figured that was the problem. Drove the rest of the way home, hopping at every start up (0-2.5ish mph) but completely normal at speed.
Without the load behind the truck i could feel a slight hopping but not bad at all. Replaced the u joint and it made 0 difference. Also added traction bars which made the unloaded truck ALMOST impossible to hop but still possible. Again ONLY while slipping the clutch. It had the factory clutch so i figured it was about gone. Yesterday i installed a new southbend clutch and flywheel and towed today. Hopping is still THERE! Not nearly as bad as last time i towed but im guessing that is because of the traction bars.
Anyone else experience this? what the hell could it be? It feels like something in the drive train is loading up and releasing
early 99 f-350 7.3 6speed crew cab
banks exhaust, chip, big head, exhaust houseing
Ford AIS intake
5.5" fabtech lift w/ 35x12.50/18's