Thread: Auto transmission - '01 Disco 2 V8 - do I have issues?

On my D1 it only shifts to 4th at around 75/80 kph just before the converter locks , i would think the D2 is similar ?

Im pretty sure the shift pattern is governed by the computer on the D2 so I would say you may have a trans temp sensor issue if anything.

Im not all that sure on those as the electrickery covers up most of any mechanical issues.

It shouldnt be loading up (lugging) the engine in 4th or lockup and will more than likely use less fuel holding 3rd and reving a little more rather than lugging the engine as well.

The D2 V8 will shift into O/D lock up at about 60k, (1500rpm), under light throttle. This is normal. BUT, the change in performance when hot isn't. I would also suggest that the Airflow meter outputs to the ECU also effect the trans computer, as it helps with engine/ trans load signals etc. A faulty AF meter can cause probs with Td5 shift quality too. It may be the trans could do with a service and presssure check, take it to someone who knows these 4HP22E boxes to get this done. Where are you located?
One more thing, are you certain it isn't in sport mode at times? This will allow late shifting etc.
JC

Originally Posted by justinc

The D2 V8 will shift into O/D lock up at about 60k, (1500rpm)

Isn't it around 80kph for the overdrive?

Originally Posted by mcrover

It shouldnt be loading up (lugging) the engine in 4th or lockup and will more than likely use less fuel holding 3rd and reving a little more rather than lugging the engine as well.

This is absolutely the case on Commodores, I always have them in "3" unless at higher speeds. They hang onto 4th at low speeds (ie. 55-60 kmh) and return poor fuel economy.

Do you auto people drive in "D" all the time or "3" around town and "D" at speed?

(May start another thread)

Originally Posted by joel_nicholson

This is absolutely the case on Commodores, I always have them in "3" unless at higher speeds. They hang onto 4th at low speeds (ie. 55-60 kmh) and return poor fuel economy.

Do you auto people drive in "D" all the time or "3" around town and "D" at speed?

(May start another thread)

If im not getting over 80kmh I normally sit it in 3rd as it doesnt like to change out of 3rd at lower speeds anyway.

Hi Justinc.

When this problem appears, it doesn't appear to make any difference whether in sport mode or not. It just hangs onto 3rd forever.

When driving yesterday with a trailer behind, even 2nd was hanging on way too long (close to 4000rpm), even with very light throttle.

I think it might be time to see a tranny specialist before bigger problems arise.

I'm in Perth, so I think Jordan Rovertech or Discovery Auto are about all there is to chose from.

- SmokyBear.

Originally Posted by justinc

The D2 V8 will shift into O/D lock up at about 60k, (1500rpm), under light throttle. This is normal. BUT, the change in performance when hot isn't. I would also suggest that the Airflow meter outputs to the ECU also effect the trans computer, as it helps with engine/ trans load signals etc. A faulty AF meter can cause probs with Td5 shift quality too. It may be the trans could do with a service and presssure check, take it to someone who knows these 4HP22E boxes to get this done. Where are you located?
One more thing, are you certain it isn't in sport mode at times? This will allow late shifting etc.
JC

I'll have to get a specialist to check on the tranny temp sensor I guess.

Thankfully my Disco doesn't lug in 4th at all & shifts down sweetly when it is meant to.

Originally Posted by mcrover

Im pretty sure the shift pattern is governed by the computer on the D2 so I would say you may have a trans temp sensor issue if anything.

Im not all that sure on those as the electrickery covers up most of any mechanical issues.

It shouldnt be loading up (lugging) the engine in 4th or lockup and will more than likely use less fuel holding 3rd and reving a little more rather than lugging the engine as well.