Question about 1996 Mitsubishi Montero

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1996 Mitsubishi Challenger 2.8D Auto transmission flaring.

While travelling on the open road in overdrive at approx 100km and approx 2500rpm the rev counter will 'flare' up to almost 3000rpm. It stays at the higher rev's for anywhere between 5 -15 sec and then drops back to normal rev's again. It does this inconsistantly but is doing it more frequently now. Initially it would only do this on the odd occasion but now it does it everytime we take the vehicle out. On the last trip it would not up change when we needed to, i.e. when ovetaking or on a steep hill. I think it may be the lock up clutch. What are your thoughts?

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First inpect the oil condition, pull the trans dipstick and see the oil colour and smell it as well. f it smells burning then you know there is quite a bit of wear and tear inside.
Second shot is to perform a transmission flush and replacing the filter inside the transmission as well.
If all these are unsuccessful then you are looking at a full rebuild of the transmission.
Cheers

Posted on Jan 26, 2009

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What is the o/d button on top of automatic gear stick for please


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High to low /low to high ratio, you will need to be stopped and the transmission in neutral for this to be changed.
The 2wd - Auto - Lock switch can be switched at any time, as it operates an electromagnetic clutch - 2wd is rear wheels driving only - Auto - is to automatically engage 4wd when wheel slippage is detected (this also happens when turning at intersections, due to the inside wheels having a shorter path to the outside wheels, and can give a binding effect on sealed roads (I don't drive with it in auto on sealed roads) auto is excellent if you get, or expect wheel spin from an intersection when wet, just flick it on before or when you have wheel spin, also on gravel roads, having it on auto will greatly reduce the sliding of the back end, and make the car noticeably more stable.
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Also the O/D (overdrive) button on the side of the Tee shift lever, is to engage / disengage overdrive (5th gear) - never do heavy towing in overdrive, this will cook the transmission and overheat the engine (due to the radiator being used as a heat exchanger for the transmission fluid.
Another little quirk - if the transmission light starts flashing every 40 to 50 km, this can indicate that the wheels are different diameters (a flat tyre, or tyres have been swapped around and the spare is more or less worn than the other tyres), the computer will pickup that the wheels are turning at different speeds.
When cold, it is normal for the transmission to stay in 3rd (2-3 minutes of driving), until it has warmed up, and then stay in 4th for a few more km's (5-6 minutes), before it has warmed up enough to change into 5th (overdrive).

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Since fitting aod transmission mechanical 4 speed overdrive I have noticed a marked increase in fuel consumption I have a 1968 mustang with 2.9 gears and it had a C4 in it before.I did not have a tacho...


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i hope this helps
-matthew

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