I guess I was misunderstood... I did mean no going over 35 on DRY GROUND.. and no you absolutly cannot shift the 242 on the fly.. IF you go from open 2WD to locked 4 part time (which is the first selection ) at speeds you will do damage to something .. Part time is exactly that.. Designed to be used Only PART of the time.. IF you are driving normally down the road you should be in Full time..

And one other thing that noone else has toched on.. Are all of your tires the same size and same brand.. Different Manufacturers sometimes have varience in tires sizes. Even though they may both be 225/70 or whatever if they are different manufacturer they may be different size..

This matters when you are in 4 Part time because the front and rear driveshafts are locked and turn at the same time.. Different size tires will cause a bind..

Here is a Techservice bulliten that came in to my shop some time ago about the 242 T case...Its actually a very common problem because lots of people only buy 2 tires at a time and with worn tires on one axle and brand new Different manufacturer tire on another you get a similar problem..

Pay special attention to number 4........

Carl
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1. Before attempting any diagnostic work or trouble shooting on the transfer cases, make sure that the tire pressures and circumference are all the same. Do not just compare tire sidewall labels; you must measure each tire around the center of the tread. A stagger gauge (RSG Part # 910-82017) will let you do this with the vehicle on the ground in 5 minutes. The tires must match in size to ?ö (.250), outside circumference, if they do not sell the customer on a new set of tires and measure them again. Mismatched tire sizes and pressures will fail the differential in these units very quickly and will cause the unit to be unable to shift out of 4 wheel drive back to 2 wheel drive.



2. Transfer case will not release from 4WD even when shift lever is put into 2WD- this is caused by the unit getting spline locked internally due to mismatched tire sizes or pressure. The unit will release if run on a lift because the wheels are not turning on the ground and tire size does not matter if all 4 wheels are in the air. Measure the tires with a tape around the middle of the tread or a stagger gauge and make sure they are all within ?ö (.250) and make sure all tire pressures are equal. Do not remove the unit for this problem; you will only waste your valuable time.



3. Transfer case will not shift standing still- this is normal and correct. The shift fork is spring loaded and the front and rear tires must be moving at the same speed in order for the unit to shift.



4. Proper operation in the different ranges- Make the customer aware that this unit can be operated in the fulltime position on any surface, wet or dry pavement. Part-time and Low must only be used in mud, deep snow, or sand.