Ranger No Reverse
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Ranger No Reverse
This is my first post, I have a 98' 4.0 auto w/160k miles. Reverse went out with a clunk while backing out of garage. Forward gears seam to work properly and no previous signs or problems. Any suggestions.
Kevin
Kevin
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From: sunny fla sometimes windy
Just to make sure you used dexron mercon 3? In the pan there is a little plunger deal that is part of the reverse, Did you notice anything strange in the valve body. How was the fluid when you changed it metal flakes,dirty, burnt smelling?
Logistics Pro
Joined: Jan 2002
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From: suburban atlanta
Reverse uses a band and servo. If the band breaks or falls off the strut, or the servo fails you won't have reverse. If you drop the pan now, look to the rearmost of the transmission for 'spare' parts. Check that the rearmost servo arm looks as if it is connected, and check that the strut is in place at the other (fixed) end of the band. Check that the band is not snapped.
If things aren't right, get out your wallet. Servo pressure is highest in reverse in most transmissions, so it's not likely a pressure problem, or a servo leakage problem.
tom
If things aren't right, get out your wallet. Servo pressure is highest in reverse in most transmissions, so it's not likely a pressure problem, or a servo leakage problem.
tom
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Post Fiend
Joined: Oct 2005
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From: Kiev, Ukraine
The first - U heve to check reverse piston. TO do it remove pan and u WILL SE its cover retained with 4 6mm bolts. Remove and chek it, but ususally reverse band is worn. To replace it U have to take all the tranny appart and there is a reason for full rebuild.... So I used to make a bit longer reverce piston stick and drive till all the tranny is dead....
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Joe Kucinski
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From: Salt Lake City, Utah
Originally Posted by KEVIN PERRY
I removed the pan and changed the filter, replaced pan w/new gasket and refilled w/new fluid.
Kevin
Kevin
The correct procedure is to disconnect the cooler return line, and let the vehicle run in parck. This will allow the tranny pump to pump fluid through the torque converter, and other passages, through the tranny cooler and then gets expelled into a bucket. Keep adding new fluid till all the old fluid is gone (it helps to use a clear vinyl tube to see the fluid color.) This takes about 11 quarts and any method short of this will not get all the old fluid out. Once you have flushed it with this method, then drop the pan and change the filter, and refill the transmission. I have had this done several times on my '94 Aerostar) I may have a different vehicle, but the tranmission is extremely similar, about the only difference is yours has more electrnic controls, but the fluid pump should always be running when the engine is on.
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Okay I drop the pan and no spare parts lying in it.Removed filter and small square cover to the left rear (looking up) and found a piston, about 3'' in dia., that wasn't connected to anything on top, should it be? The top end looked kinda ruff. Everything else seemed to be ok w/nothing broke that I could see. No burnt smell or filings or shiney things in the pan. What now?
Kevin
Kevin
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Joined: Jan 2002
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From: suburban atlanta
I don't know your trans exactly, but most servo pistons do 1)either have a rod in their center that goes through a hole to push on one end of the band, or 2)moves an external lever that pivots on the servo cover and pushes on the end of the band.
If there is a hole in the top of the cylinder that matches the 'rough' spot you found, I'd bet the servo rod broke off. Wander to your dealer or boneyard and look at a comparable model... If the rod broke off, and you can retrieve it, you can just replace the piston/rod assembly, if you can connect the rod with the band. Sometimes you can get the band into place using long philips head screwdrivers. If not, you must R&R the trans and disassemble it...
If you are able to get the band back into position, you will feel the rod connect with the end of the band when you push it into the bore.
tom
If there is a hole in the top of the cylinder that matches the 'rough' spot you found, I'd bet the servo rod broke off. Wander to your dealer or boneyard and look at a comparable model... If the rod broke off, and you can retrieve it, you can just replace the piston/rod assembly, if you can connect the rod with the band. Sometimes you can get the band into place using long philips head screwdrivers. If not, you must R&R the trans and disassemble it...
If you are able to get the band back into position, you will feel the rod connect with the end of the band when you push it into the bore.
tom
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From: Salt Lake City, Utah
This should be a fairly simple fix, though getting the band readjusted might require a bit of know how. Anyone here know the procedure? But yeah, sounds like that servo rod broke. Nothing you can do to cause or prevent that from happening, just one of those freak happenings.