Oklahoma Outlaw

2005 F-150 5.4L

Jerks at lower speed also going up hills under light accel. Trans jerks like the TQ is unlocking and locking rapidly does it mainly at 50-70 with engine under light load...heavy load then the trans downshifts. Did this once before at 50k miles took to Ford dealership they replaced the plugs... now at 71K its been doing it again for the last couple of months. No error codes.

Any ideas?

BTW a kinda shady trans guy said (without driving)yep its the transmission I'll do it for $1500 or get you a Jasper and put it in for $2800

Any help/opinions appreciated!

CarlC

Is it like a rumble strip almost? If so, try adding a bottle of friction modifier additive to the rear diff. If that doesn't work try the COPs (coil on plug).

GATORB8

The plugs can occasionally back out, too. Try retorquing them.

Summers22

iTrader: (2)

Sounds exactly like what my truck did from 45-55mph. I replaced the plugs along with the boots and springs on the COP's, and now its smooth as butter.

Oklahoma Outlaw

smooth as butter... that would be nice. Thanks for the help guys!

08silverbullet

Mine makes a clicking or popping noise when in reverse and I press the gas all forward gears are fine any ideas on what could cause this I was told it could be u joints or transmission only 41,000 miles on my 08 4.6

808f150

I'm experiencing the same thing. Brought it to the mechanic who had rebuilt the trans for me a little while ago and he told me to replace the coils and plugs. Said he has seen the coils go bad causing misfires and the trucks not throw any codes

2006scab

Mine was doing the same thing between 50 to 65. It would go away if you got on it. I changed the plugs and it went away.

zapperman

Well, I'll chime in that it was something different for me. I had the "rumble strip" feel at around 50 mph at small incline under slight load/ acceration. I got it without fail every day at the same spot on the freeway onramp after work. For me it was the torque converter shudder. Read tons about it and the lubegard product "Dr. Tranny shudder fix". Put 2 tubes of it in over a month ago and have not had a shudder since. Best $12 I ever spent.

Summers22

iTrader: (2)

Same with me!!!