53 disco 2 auto no top gear until warm

Hi all - New to this forum so please be gentle!

As the title suggest just wondering if the disco not getting to top gear until its warm is normal or is there something that needs sorting out?

Well I suppose you have mistaken 4th gear with lock in 4th gear.
Count the real gear-changes to see if you really get to 4th.
Chosing lock is only done when warm, so that is normal.
When locking the gears, there is no "spin" anymore within the gearbox.
You can count on a rev-drop from 2500rpm to keep the speed of 90kmh, to 2000rpm with the same speed.

Regards, Koen

stormy_be said:

Well I suppose you have mistaken 4th gear with lock in 4th gear.
Count the real gear-changes to see if you really get to 4th.
Chosing lock is only done when warm, so that is normal.
When locking the gears, there is no "spin" anymore within the gearbox.
You can count on a rev-drop from 2500rpm to keep the speed of 90kmh, to 2000rpm with the same speed.

Regards, Koen

Click to expand...

Thanks Koen

Not quite sure what you mean by lock? I am pretty sure that it stays in 3rd until its warmed up but I will check rpm before and after.

Cheers

Phil

Hi Phil,

Mine does exactly the same as yours, glad to see that it's seen as normal though, i was wondering....
Thanks for the info Koen

Dave

pjs6557 said:

Thanks Koen

Not quite sure what you mean by lock? I am pretty sure that it stays in 3rd until its warmed up but I will check rpm before and after.

Cheers

Phil

Click to expand...

Hi Phil, what Koen is referring to is "Torque converter (TC) lock-up"

In any autobox there is a device called a TC which is a bit like a clutch and it is this which allows the autobox to change gears and gives a certain amount of "slip".

However, above 52mph the TC 'locks up' giving, to all intents and purposes, the same feel as if you were in a manual box car in fifth gear, that's why the revs drop about 500rpm, as there is no more slip.

This is the correct functioning of this gearbox.

Cheers
Dave
PS You should be in 4th gear at about 35-40mph, on a light accelerator pedal load.