I have a 2000 F-150 5.4 with auto. If I am coasting about 10-15mph and get on the throttle I hear a thump noise before the tranny kicks in. I have only 9,000 miles on it. It almost sounds like a mount is broken or something. Anyone else have the same problem? Thanks, Craig

 

Mine does it too,haven't figured it out yet.
I have tried a flush,and I'm about to try changing the shift solienoids. If you only have 9000 miles on it,I'd get a dealer guy to ride with you and check it out. Does it feel like the truck is at half power until the thump happens? That's what mine does,and now the thump is getting harder lately. last time I thought the tires were going to chirp.....98

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98 F-150 4.6 Litre XLT2wd Ext. cab
Yokahama AVS/ST's
prarie tan/tan int.
K/N gen.II fipk
custom dual exh/gibson rectangle tips/rear exiting.
color matched snuglid
Superchip!!!
Westin nerfs blk .powdercoat
Clear front corners
Stillen Quad light air dam, sweet!!
Euro taillights
Cobra 75WXST cb w/weather alert
[b]Kenwood cd w/Radio Shack speakers,don't laugh it sounds pretty good
Viper alarm
On the way/wheels,tires, etc..etc.......
doin the monochromatic boogie
on the front end.
Come see my new picturesat www.my-f150.com

officialtomwaits.com
reverendhortonheat.com

WOW,what a cool site!

FENDER GUITARS ROCK!!!

 

Mine did something similar as well, but I have a 5 speed. Turns out, the tranny cross bar member bolts were loose, and one was missing...check yours.

-AR

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2001 F-150 XLT 4X4 Off-Road, S/C, FS, Black[*] 4.6L Triton V8 HPI[*] 5 Speed / 3:55 Reg. Axle[*] Keyless[*] Premium Audio CD

Mods:[*] K&N Cold Airbox / Throttle Body Mod.[*] Flowmaster 40 (3" x 20" "Turn-Down") [*] Cranked Torsion Bars[*] APC XENON PLASMA Super Whites[*] Bugshield[*] Bedliner[*] Ventshades[*] Taillight Covers (Slotted)[*] "Light Argent" 4X4 Off-Road Decals[*] K&N & Flowmaster Stickers (Under the Hood)

Audio:[*] Rockford Fosgate G360A2 Punch Amp[*] JL 12W3-D2 (JL ProWedge Box)

Build Date: 8/23/00 (Kansas City Plant)

arobbins@mail.liberty.k12.mo.us

 

I've had the same problem and it's gotten worse since day one (2,250 miles now). Based on a Ford service advisory, my dealer checked the alignment of the main gear in the rear end and found that it was beyond the specified tolerance. They believe that this misalignment is what's casuing the clunk. Next Monday (12/18) they're going to replace the main gear, bushings, shims and bearings. They think this will eliminate the problem. I'll do another posting in about a week...after I've had a good chance to check the repairs.

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XLT 4x2 5.4L 3.55L/S CapChairs 6CDChgr BedExt Moonroof 2Tone-IsBlue/Silver SmittyBilt Nerf Bars-Blk Stull Billet Grille TopDeck lid Frd bug deflect

 

Did you get it fixed? Mine is still doing it but I can't duplicate it consistently. Sometimes it does, sometimes it doesn't. The worst kind of problem!

Just wondering what you found?

 

It's not going in until Tuesday. Mine does the same thing. Sometimes it does it, sometime it does not. I'll let you know Wed.

 

The repair seems to have improved the situation except at right about 23-25mph...although I must admit that the truck seems to shift better and feel smoother now. Before the repair, the thumping was pretty consistent at anywhere between 20-30mph. The service staff was really great so I don't want to ruin their X-Mas with a "comeback". I'll take it back next week and see what else the can do.

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XLT 4x2 5.4L 3.55L/S CapChairs 6CDChgr BedExt Moonroof 2Tone-IsBlue/Silver SmittyBilt Nerf Bars-Blk Stull Billet Grille TopDeck lid Frd bug deflect

 

I have the same problem. I had the dealer check it out, they said all the pressures check out fine, and that the clunk was normal???? Ya right. I may try another dealer in a couple of months, see what they think.

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2001 Supercrew 2x4 Black Lariat, gray interior,5.4,moonroof,
sliding rear window,6 cd changer,tow package,3.55,
line-x, starboard running boards.http://albums.photopoint.com/j/AlbumIndex?u=1396743&a=10431214

 

Well...I took my truck back this week and they did another round of diagnostics. No obvious problems discovered, although everybody agrees that the clunk is there and that it seems to be worsening. My service rep confirmed what Factory_Tech recently said in another thread. https://www.f150online.com/f150board...ML/000784.html It's cheaper for Ford to do an R&R than to spend local shop time on extended diagnostics. The upshot is that they've ordered me a new tranny. It should be in sometime next week. I'll keep ya'll posted.

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XLT 4x2 5.4L 3.55L/S CapChairs 6CDChgr BedExt Moonroof 2Tone-IsBlue/Silver SmittyBilt Nerf Bars-Blk Stull Billet Grille TopDeck lid Frd bug deflect


[This message has been edited by CACeeJay (edited 01-04-2001).]

[This message has been edited by CACeeJay (edited 01-04-2001).]