1998 Montero Sport LS, 4 Door, automatic, 3.0L, 4x4
While maintaining speed at approximately 35 mph, with the 'overdrive' on, the transmission will switch back and forth between highest two gears, causing vehicle to shudder. With "OD OFF," the problem goes away. Would like to have this fixed, before it becomes a bigger problem. Any idea what might be the culprit and who I can trust to repair (AAMCO, Dealership, etc.)?
there is an sensor on the speed odmeter cable on the side of transmission. it will kill thr overdrive and cruise control but not the speedometer. about $50.fixed 2 explorers that way
It is the band strut for the kickdown band. The band is worn out and got too loose and the strut fell out. You can put it back and see how it works but you will need to remove the valve body to get it back in. It is for 2nd gear. Does the transmission hold 1st up to about 25 miles per hour and then shift right to 3rd.
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first we must ID what box is there
not told,just adding some or full drain and fill.?
A/T lube (is revised)
30RH box.? Mopar ATF +4 or 32RH
4 Speed RWD/4X4 AW4 Transmission ATF+4
or 4 Speed RWD/4X4 Transmission
what I do is look at the box and its side tag, the work from there
the USERS guide covered that, lost?
normal drive yes the od unit comes on after 40 mph is reached and maintained above that speed , if you happen to engage 4x4 then the od shouldn't come on at any speed , point of reminder this model and year has a recurrent problem with 4x4 transfer case not disengaging all the way , and causes some delay in transfer of engine power to proper drive axles , its mostly caused by improper transfer case lube oil changes and dirt builds up inside it causing all sort of mayhem
It always starts out in first, it's a 3 speed automatic, that's what automatics do. they start out in first and at about 15-20 miles per hour , they shift to second gear, and when the speed is about 35-45 MPH, the transmission automatically shifts into third gear, or Drive.
Bigger automatics have 4 or more speeds. Till recently, 4 speeds were the norm, and fourth gear was often dubbed Overdrive, as it allowed the engine to run slower in 4th gear, than it had to maintain speed in 3rd gear, drive. It's good, it increases your mileage per gallon of gas, so you save that way, but like all things more complicated, they cost more to fix when something goes wrong.
I would take it to 2 or 3 or more different shops and ask for an estimate to fix it.. they will probably know what causes this condition. and probably will not charge you anything.. if they want to charge you for an estimate go somewhere else. you really do not want to trust them.. When you get several estimates and several of them tell you the same thing then its a matter of who do you trust??.. Check the shops out on Yelp.. actually sounds like it could be something simple like throttle presure adjustment.. But i cannot see your car from here.
Is this a manual or automatic transmission? When was the last time the fluid was changed? If it's a 4 speed and a 4 cylinder engine than that could be the right RPM. It could also be the overdrive is not working. Some SUVs have a overdrive override button on or near the shifter.
Depends if you have a regular 3 speed automatic, or a 3 speed with overdrive. Put it in drive, it will start out in first gear, then shift into second at about 15 MPH, into third at about 30-35 MPH. With overdrive, fourth gear will kick in at about 45-55MPH.
Over Drive..... Generally speaking, overdrive (OD) is the highest gear in the transmission. Overdrive allows the engine to operate at a lower rpm for a given road speed. This allows the vehicle to achieve better fuel efficiency, and often quieter operation on the highway. When it is switched on, an automatic transmission can shift into overdrive mode after a certain speed is reached (usually 70+ km/h [43+ mph] depending on the load). When it is off, the automatic transmission shifting is limited to the lower gears. For an automatic transmission, it is almost always best to select overdrive and allow the transmission to control engagement of the overdrive. (It may be necessary to switch it off if the vehicle is being operated in a mountainous area or when towing a trailer.) With a manual transmission, overdrive should usually be selected when the average speed is above 70 km/h (approx. 43 mph).
Sounds like dirt in the transmission may be causing the shift points to not work properly.
Is this the problem you are having?
If it is, then I would say that one should have the fluid changed out of the transmission at a local shop.
If this does not solve the problem, then the solution may be a rebuild of the transmission.
the reason it might be shifting so early is because of the gear ratio in the rear end of the truck. it is common in the 2 wheel drive basic model pickup because they were designed to work not travel.
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