Vehicle & Technical > Discovery

Auto Box seems to be slipping.

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Budgie:
I'm after some ideas about a problem with the auto box in a 3.9 V8 Disco I acquired a few months ago.
It drives fine for about an hour, then when you try to accelerate it feels like the clutches are slipping. I thought it was only in top but today it was doing it in 1st as well.
As soon as you easy off then it feels like in engages and becomes smooth but a little touch on the throttle and it's back vibrating again.  :?

I've got to give it an oil & filter change as I don't know when it was last done. The service record says the last service was July 2003 which could be true as it's only done 8000 miles since then!!  :shock:
I had to put about a litre of ATF in the box when I checked all the levels, and got a good load of that on the steering shaft.  #-o
So, I was just wondering if anyone else has had a similar problem and what the solution was?
I'm going to give Ashcrofts a phone shortly to see if they can come up with anything. I hope it's nothing serious as a recon box is half the price I payed for the whole Disco!!

Oh, one other thing - when the engine is warm and you restart after stopping for a while, the engine revs up to 1800-1900 rpm before slowly returning to normal tickover.
I've removed, cleaned and replaced the stepper motor, which has made it a little better, but it there anything else I can look at to solve this issue?

Cheers,
Budgie.

beast5680:
sounds very like a torque converter problem if its doing it in all the gears :?

Budgie:
That thought had crossed my mind.
 I'm hoping that a couple of oil changes will do the trick as it's fine before it's really warmed up which could be the ATF breaking down if it's been in there since 2003.  [-o<

andycwb:
I'd get the ATF changed twice before worrying about expensive options.  An awful lot stays in the torque convertor during a change.

Budgie:
That's the initial plan Andy, first oil change will be with a new filter kit, then run it for a couple of weeks and change just the oil. I may even do a third if it seems to be making a difference.

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