Slipping/hard shift when I first start moving.

[mg175150]

I have a 1999 F150 4 x 4 5.4 V8, auto. I have noticed before, but more recently, that when I begin moving from a complete stop the truck seems like it is jumping. (Almost feels like something is running into the back of the truck, or kind of like a hard shift) This happens at very low speeds however. I would say it occurs when the truck goes from 1 or 2 mph to about 5 mph. I thought it may be the transmission fluid so I was going to replace it and the filter. Do you think it could be the transmission being that it is occuring at such low speeds. I didn't think the tranny even shifted until it hit a higher speed. I last replaced the tranny fluid/filter about 50k ago. Thanks for the info.

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[likestomow]

Mine does that too. ('94 F-150) I just go real slow at first to get it over with. It has done this for the four years I've owned it. I wish I knew why it was doing that.

[Gmac#1]

U might be letting the clutch out to fast when starting in first. That causes the truck to jump forward and backward a few times.

[dirtyd0g]

Originally posted by Gmac#1
U might be letting the clutch out to fast when starting in first. That causes the truck to jump forward and backward a few times.

It's an auto.

[brahmus]

1-2 acctuator spring do a search! my 99 and a friends 99 did the same thing. or put a FTVB!!!

[Gmac#1]

Originally posted by dirtyd0g
It's an auto.

Ya ur right my bad.

[Loopmd]

Originally posted by brahmus
1-2 acctuator spring do a search! my 99 and a friends 99 did the same thing. or put a FTVB!!!

Did the search and came up with nothing! Mine is doing the same thing and anymore help/details would be greatly appreciated!

[dirtyd0g]

I think he meant 1-2 accumulator. They are prone to breaking springs. The accumulator is located on the front driver side of the transmission and can easily be removed with a pair of snap ring pliers with the pan down.
Here are some accumulator tips
Only use the bonded rubber pistons, do not use the early aluminum ones.
Update the springs to the latest model year vehicle with similar weight. If you have a supercrew get the supercrew setup. I believe it has 1 upper spring and 2 lowers. Likewise if you have a shortbed f-150 yo want the correct setup for it as well. Do not remove the lower accumulator spring on a truck for any reason, the shifts will be abusive.
Alan
If you change the piston change the cap as well. If the piston or cap are hard from age replace them both as a set.

[brahmus]

Originally posted by dirtyd0g
I think he meant 1-2 accumulator.

oppsspelling and head were in the wrong place but yes dirtyd0g nailed it!