1998 ranger-no reverse

[greeny]

hi everybody, my 1998 4x4 ranger with a 3.0 auto. has lost rev. when it disengauged out of 4wheel drive H to 2wd. had the shifter in rev. and touched the gas and heard a bang,thought it was louder than a reg disengaugement(was not in 4x4 for awhile) been looking at some threads on sight for no rev. problems. i have forward in all drive gears,also in low 1,and it seems to have eng. brakeing in man. 1. pulled the pan down and found nothing as to any metal.fluid looked ok no burnt smell. removed the rev. servo piston,piston stemm has small cracks on the top flat of the rod.no mushrooming,bore looks unscared,oring is not damaged,piston has stong spring tension when accuated. put scewdriver in the bore to touch the band while it was in park and seemed to have spring tension there,but then was told to do that when it was in nuetral and spinning the drive shaft and then t it seemed to get very loose and heard what i thought was the band jingling around. will the band be loose and making this sound in N and not in P? is there any way it could have happened (no rev.) due to the transfer case?i would like to rule out the transfer case.the 4x4 still works,goes in and out.thanks for any help in this problem---greeny

 

[greeny]

rev.band is out.

getting it fixed from a friend for 80.00 dols. +some parts.

 

[greeny]

well put the rev. band in[it was broke] and some seals/gaskets,valve body gasket also.problem still exists---no rev.-valve body was torqed to spec.going to try to get another rev. servo unit/new orings and try that.any suggestions anyone?

 

[ragajungle]

Greeny,
I am having the same problem. I have done a ton of research on this and from what I gather the main support is probably cracked (thats where you get the BANG from) and bore going through it is probably gouged from scoring and not rebuildable. This is a common issue with the 5r55e trans.

If you DO decide to pull the trans and want to verify can you grab some pics if you find the damage??

I have also heard that the transfer case shift fork can break causing multiple similar issues.

Thanks,
Mike

 

[greeny]

thanks mike, the guy that put the rev. band in said he was checking the parts as they came out,and going back in. he said i should be ok.he was a rebuilder before he went to the post office to be a mechanic. after we put the trans /transfer case back in,filled it with fluid,and pulled it through the gears on the lift the tires were moving in rev. i did not rev it up. i must of had some line pressure to the servo to make them wheels move. at this point i am thinking-valvebody[maybe a stuck valve,when that hi pressure engagement happened that broke the rev. band. also the transfer case. on this i can not find any tech. info to tell what function will cause the no rev. from the transfer case. say if the transfer case is engaged in 4wd-h/low will that mean its ok and would not cause a no rev.[i had it go into 4wh and back out.i did not try 4wl-worried about it getting stuck in4wd.]. i am going to check the line pressure in reverse.then pull the pan again and take out the rev. servo and check the band again to make sure it did not move out of pos. for the servo stem.the stem has some cracks on top the flat,but no chips out of it. i will take pics. if i find the problem.again thanks-greeny

 

[greeny]

well i got a gauge and pressure checked the trans. the pressures were all within range. reverse was 179 with the fluid cold. I was told the rev. servo piston stem has a radius on the top,were it contacts the band,my stem top is flat. would this cause the band to not apply as tight as it should to drive rev.? I

 

[greeny]

Well I pressure tested the trans. The readings were all within specs,accept rev. It was 179 with the fluid cold. I was told the rev. servo piston stem has a radius on top of the rod. my top of the rod is flat. could this maybe have been knocked off? we did not see anything in the inspection of the trans when we changed the rev. band. thinking maybe the band is not applying enough to move the truck when its on it's on weight. wheels did rev. on the lift after it was all back together.I guess i will have to pull the servo once again to match it up for lenth,so it does not overstroke and break another band?

 

[greeny]

got rev. working again

well after a long struggle with the trans. it came down to the rev. band we put in.(we did not hold it in place with the servo stem when it went together .dislodged it self from fingers and moved forward on the drum. after about 1 hour working through the servo bore hole i was able to get it set back on the fingers,with the pad in clear view to contact the servo stem.greased the new orings on the piston and buttoned it all up.

 

[greeny]

got rev. back

Greeny,
I am having the same problem. I have done a ton of research on this and from what I gather the main support is probably cracked (thats where you get the BANG from) and bore going through it is probably gouged from scoring and not rebuildable. This is a common issue with the 5r55e trans.

If you DO decide to pull the trans and want to verify can you grab some pics if you find the damage??

I have also heard that the transfer case shift fork can break causing multiple similar issues.

Thanks,
Mike

it was the band,put it in and it got unseated off the fingers,1 hour to finess it back to pos.with the servo stem. works great now--greeny