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Tranny slips

Tiny
REAMSENGINEERING
  • MEMBER
  • 1999 FORD F-150
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 115,000 MILES
My 1999 F150 (owned 1 week) w/ v6 and auto trans is making a high pitched buzzing noise after warm up like a ratcheting sound your hand ratchet makes going backwards but much louder. In park the engine runs fine and makes no abnormal noise on acceleration so I think it is trans realated. Appears the tranny might be slipping slightly until the noise goes away then it feels like it is locked-in solid and fine until I punch the gas and it starts again. If I pull over and stop and wait a minute or two it will start back up fine for a while and start back to making noise. Reading other write-ups I'm thinking it could be slipping bands, bad trans solinoids. Fliud is totally burnt and brown.
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Wednesday, September 29th, 2010 AT 8:32 PM

9 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
First off change the fluid and the filter and see if it works any better.

If not perform a stall test in reverse and first gear. Put vehicle in reverse stand on brakes and bring up rpm as high as it will go then stop and record reading back to me do this in first and reverse.
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Wednesday, March 24th, 2021 AT 10:06 AM
Tiny
REAMSENGINEERING
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OK. Will do. Should I test the solinoids or anything else while I have the tranny pan off? If so, how/etc. THANKS.
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Wednesday, March 24th, 2021 AT 10:06 AM
Tiny
BLACKOP555
  • MECHANIC
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If you want put hands on solenoids and have someone turn key on and see if you hear or feel the solenoids bugging.
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Wednesday, March 24th, 2021 AT 10:06 AM
Tiny
REAMSENGINEERING
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  • 6 POSTS
Pan off and I found a part rolling around in the bottom (picture) I cannot find any place that it might have fallen from?? Could it be a factory "oops" or am I missing something?
Trans is believed to be a 4R70W (14 bolts around pan) I can feel a click from the solenoid around the 3 solinouds but appears to be primarily from just one (at fingertip in picture) is that normal? Will reinstall pan and fill with fluids either tomorrow (or maybe today if I hear back from you on the missing part).
Thanks for the assist.

Pics attached of mystery part and location of test-a


https://www.2carpros.com/forum/automotive_pictures/578225_UNTITLED_1.jpg


ctive solinoid.
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Wednesday, March 24th, 2021 AT 10:06 AM
Tiny
REAMSENGINEERING
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  • 6 POSTS
. Also cannot get the torque converter to drain. Have the lines disconnected at the tranny but no flow. Is there a plug somewhere?
Thanks.
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Wednesday, March 24th, 2021 AT 10:06 AM
Tiny
BLACKOP555
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That part is from the factor for plugging the dipstick tube. When its filled its knocked into pan and its forgotten about and thrown out during trans service.

Cant read that picture of the receipt too small sorry.

To drain the tc I usually suggest running vehicle and putting in gear. Put intake line to trans inside clean bucket of fluid and the outlet line in the output to the trans cooler. Start vehicle and keep adding fluid untill fluid coming out is clean. Flushes entire system out. Best way gets it all clean and its quick.
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Wednesday, March 24th, 2021 AT 10:06 AM
Tiny
REAMSENGINEERING
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Thanks. Lines appear ridgid. Do you use a separate set of flexible lines or is there a trick to getting the clean fluid container close to the end of the lines?
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Wednesday, March 24th, 2021 AT 10:06 AM
Tiny
BLACKOP555
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Usually when line brackets are removed they are long enough to go right in pail but I have used a larger piece of flexible hose that I can thread into it with an adapter. Its not under too high of pressure.
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Wednesday, March 24th, 2021 AT 10:06 AM
Tiny
REAMSENGINEERING
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  • 6 POSTS
OK, Got the fluid drained. Pulls off fine and when brakes applied the tranny doesn't slip when cold. Haven't gotten it warm yet but is still making noise related to tranny. Appears to be shifting up and down at incorrect points.
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Wednesday, March 24th, 2021 AT 10:06 AM

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