jrmongi

well i wanted to know if any one had this same problem i read a few posts about transmission slips but i did not read any with matching symptoms. when im driving usually between 40 and 50 mph maby a little slower and i push the gas a little bit more only to gain 2-3 mph or just keep up with the car im following i feel a bump coming from my drivetrain, i feel usualy 1 but up to 3 bumps they feel like for example driving over a 1 inch curb to a driveway. i have changed all fluids in the truck about 1000 miles ago with no effect. i have noticed the axle seal on the rear diff is leaking quite a bit now i am keeping it topped off. i played around a little bit when i put the truck in 4wd or use the od off or i get on the gas hard or haul a extra 100 to 200 lbs no more bumps. what do you guys think im puzzled thanks in advance any help

jrmongi

tires are new did it with old tires and the new one good balance, new brakes the truck had 110,000 on it iv had it since 45,000 taken good care of it problem started last year after i got rear-ended by a riceburner my bumper was scratched but no other damage hope that helps thanks again

rick99601

what kind of spark plugs did you put in when they were changed?

Mod (Ret.)

Check the U-joints on the drive shaft.

jrmongi

my plugs where changes at 50,000 from the ford dealer when i got the truck and the u-joints seem to be tight i crawled under the truck to see if there was any play in the joints and i detected no wobble thanks again

jrmongi

well i took my truck to the local shop and had them go with them for a ride drove them around for about 10 minutes got my truck to do the bump then i let the tech drive they cleared the trany. what i was told was it may be the u joint binding up or the slip yoke on the drive shaft. guess i have my weekend project let me know what you guys think thanks

quackillr

i have this same problem and it goes away when i turn the od off