1998 Montero Sport 4x4 V6 transmission with 205,000 miles doesn't shift. Just changed the tranny filter and fluid and it still doesn't shift.

I have the same shifting problems with 3 Toyotas.
I have not found a cure, but here is a suggestion.
Likely the slow shifting is sticking valves or pistons in the transmission.
Try to have the transmission serviced, by changing the fluid and the filter, if it has one.
I should recommend you go to a "highly spoken of " local transmission shop.
I have had really bad results with national brands, who are very determined to overhaul your transmission for a few thousand dollars.
Ask your local shop about the speedometer problem.
God bless your efforts.

If transmission fluid level is up to par then you just might need tranny repair. And that is not cheap.

have the autobox fluid level checked , as the age of vehicle is 15 years i would have the fluid changed unless you know for sure its been changed in the last 20k miles

Check the sensors on the transmission. May just be corrosion on the sensors or it may be a faulty sensor. Also, the torque converter bearing may have went bad due to the running it on low transmission fluid.

Hi there:On 1998 Mitsubishi Truck Montero Sport 4WD 3.0L MFI 6cyl check this Transmission Fluid Type/Capacity information:
Application: With automatic transmission

AW30-40LE transService change only - 2.3 quarts. Total refill - 10.4 quarts.



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Probably the oil filter is blocked.
Warm it all up with a 30-45 minute drive & then change the oil in the gearbox whilst it's still hot. Make sure you also change or thoroughly clean the gearbox oil filter at the same time.
After that you're looking at the tension bands & the dog-clutches, which are a specialist mechanics job.

How many miles? I'm guessing 150k atleast. A complete transmission flush/pan filter is probably your only option. Other than that, it is mechanical and needs to be rebuilt or the torque converter replaced, etc. Basically, if the flush/pan filter doesn't work, you probably need a new vehicle.

rec check fluid first. If trans fluid hasn't been changed in last 30,000 miles change fluid, filter and pan gasket. At that time inspect for foreign materials in bottom of pan or on magnet if you have one. If truck has over 100K and fluid was never changed you may have more problems if changing the fluid.

Well if sounds like possible a vacuum modulator or if the fluid and filter haven't been changed in say 40,000 miles or more I would recommend changing the tranny fluid and tranny filter.

No the volvo does not have a servicable filter, The best thing to do is to flush new fluid through the transmission periodically, replacing all of the fluid.