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Troubleshooting Transmissions

Discussion in 'Explorer & Ranger Transmissions, Transfer Cases, &' started by dallasmef, August 17, 2009.

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    1. dallasmef

      dallasmef Member

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      City, State:
      Dallas, TX
      Year and Model:
      1997 Explorer XLT
      Transmission Slippage
      Problem Solution
      Low fluid level Check and add fluid
      Wrong fluid grade Check oil fluid
      Loose drum bands, or Broken Check tension and tighten or replace as needed
      Transmission pump suction restricted Remove and clean screen/filter
      Faulty shift sensors Replace solenoids and related shift sensors
      Transmission control valve body gasket leakage Remove valve body and inspect gaskets
      Weak or broken pressure regulating valve spring Do Transmission System Pressure Test
      Low transmission pump flow due to worn pump Do Transmission Pump Flow Test
      Clutch cut-off valve sticking Remove and inspect clutch cut-off valve
      Restricted modulation orifice housing orifices Remove control valve housing and check for restrictions in valve and valve
      Excessive transmission element leakage Do Transmission Element Leakage Test Using System Pressure
      Worn clutch disks/plates Replace clutch disks/plates



      Unit Will Not Move
      Problem Solution
      Low or no transmission pressure See Transmission Pressure is low (all gears) or Transmission Pressure is low (one or two gears)
      Service brakes will not release Do Brake Pedal Operational Check. Do Service and Park Brake System Drag Checks
      Park brake applied or parkswitch misadjusted Adjust park brake switch
      Stuck control valve spool Check shift linkage operation. Disconnect shift linkage from control valve spool and check linkage movement.
      Failed torque converter Do Torque Converter Stall Test. If engine pulldown is normal, torque converter is good
      Broken shafts or gears Drain transmission to determine if large pieces of metal contamination are present
      Broken drive shafts Inspect drive shafts and universal joints for external damage. Repair
      Broken ring or pinion gear If drive shafts rotate with transmission in gear but unit does not move, a differential failure is indicated. Repair


      Transmission Pressure Is Low (All Gears)
      Problem Solution
      Low oil level Check transmission oil level and refill if necessary
      Switch failure Verify transmission system pressure. Do Transmission System Pressure Test
      Suction strainer is plugged Transmission pump may be noisy if transmission suction screen is clogged. Drain transmission. Remove and clean suction screen. Also, check condition of transmission filter.
      Transmission pressure regulating valve is stuck or spring is broken Remove transmission pressure regulating valve. Inspect for damage
      Control valve gasket failure Inspect transmission control valve for external leakage. Remove control valve. Inspect or replace gasket.
      Transmission pump is failed Do pump flow test


      Transmission System Pressure Is Low (One or Two Gears)
      Problem Solution
      Failed transmission control valve gasket Inspect transmission control valve for external leakage. Remove control valve. Inspect or replace gasket.
      Clutch piston or seal ring leakage Disassemble and repair



      Transmission Shifts Too Slow
      Problem Solution
      Low oil level (aeration of oil) Check and add oil
      Low transmission pressure Do Transmission System Pressure Test
      Transmission pump suction screen restricted Remove and clean screen
      Low transmission pump flow Do Transmission Pump Flow Test
      Excessive transmission element leakage Do Transmission Element Leakage Test Using System Pressure
      Oil passages restricted between control valve body and transmission elements Remove control valve body and inspect oil passages
      Clutch cut-off valve sticking Remove and inspect cut-off valve



      Transmission Shifts Too Fast
      Problem Solution
      System pressure too high Do Transmission System Pressure Test
      Stuck modulation valve Remove and inspect modulation valve
      Stuck or missing forward/reverse check valve Inspect transmission control valve body
      Broken piston return spring Disassemble and inspect clutch



      Unit "Creeps" in Neutral
      Problem Solution
      Warped disks and plates in transmission Check transmission



      Transmission Hydraulic System Overheats
      Problem Solution
      High oil level Check and adjust
      Low oil level Check and correct
      Wrong oil grade Check oil grade
      Lube lines pinched, restricted, or leaking Check cooler lines
      Unit operated in too high gear range Operate unit in correct gear range
      Temperature gauge or sender malfunction Install temperature sensor to verify temperature. Do Tachometer/Temperature Reader Installation Procedure.
      Air flow through oil cooler or radiator restricted Do Radiator Air Flow Test
      Oil cooler thermal relief bypass valve stuck Bypass thermal bypass valve and check to see if unit still overheats. Do Transmission Oil Cooler Thermal Bypass Valve Test
      Oil cooler internally restricted Do Oil Cooler Restriction Test
      Warped disks and plates in transmission Do Transmission Clutch Drag Check
      Leakage in transmission hydraulic system Do Converter-Out Pressure Test. Do Transmission Element Leakage Test
      Low transmission pump output Do Transmission Pump Flow Test



      Excessive Transmission Noise (under load or no load)
      Problem Solution
      Engine slow idle too low Check engine slow idle speed
      Parts worn or damaged in transmission Remove transmission suction screen. Inspect for metal particles. Repair as necessary
      Low or no lube Do Converter-Out and Lube Pressure Test. Do Transmission Pump Flow Test
      Incorrect type of oil Change oil

      High oil level Drain some oil
      Low oil level Add oil
      Air leak on suction side of pump Check oil pickup tube on side of transmission



      Unit Vibrates
      Problem Solution
      Aerated oil Check and add oil
      Failed universal joints on transmission drive shaft or differential drive shafts Check universal joints



      Unit Lacks Power And Acceleration
      Problem Solution
      Engine fast idle speed set too low Check fast idle adjustment
      Incorrect transmission oil Check oil
      Aerated oil Check and add oil
      Low transmission pressure Do Transmission System Pressure Test.
      Warped transmission clutch Do Transmission Clutch Drag Checks
      Brake drag Do Brake Drag Check
      Clutch cut-off valve sticking Remove and inspect clutch cut-off valve
      Low engine power Do Engine Power Test



      Torque Converter Stall RPM Too High
      Problem Solution
      Aerated oil Put clear hose on thermal bypass outlet port. Run unit to check for bubbles in oil
      Converter relief valve stuck open Do Converter-Out Pressure Test
      Torque converter seal leakage Do Converter-Out Pressure Test
      Torque converter not transferring power (bent fins, broken stator) Remove and inspect torque converter



      Torque Converter Stall RPM Too Low
      Problem Solution Low engine power Do Engine Power Test
      Mechanical malfunction Remove and inspect torque converter
       
      Last edited: August 24, 2009
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    3. schultp

      schultp New Member

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      Shouldn't this be a sticky post?

      Paul.
       
    4. BrooklynBay

      BrooklynBay Staff Member Moderator Elite Explorer

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    5. neallea1

      neallea1 New Member

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      City, State:
      cahokia illinois
      Year and Model:
      97 xlt 5r55e 4.0 ohv
      I have several of these, got a 97 explorer 4.0ohv 5r55e and the other day while on the highway it felt as if it popped out of gear and had to stop turn it off and restart before it would engage again. Now it shifts way too fast and I cant go over 50mph because the rpms are out the roof. any help would be appreciated
       
    6. imp

      imp Well-Known Member

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      City, State:
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      Year and Model:
      2004 XLT
      Check Fluid Level?

      2004 Explorer, build tag transmission code "V", has no means of checking fluid level.

      How is this accomplished? Thanks. imp
       
    7. Gostrider70

      Gostrider70 New Member

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      City, State:
      New Jersey
      Year and Model:
      98 xlt
      just a quick question i have a 98 explorer with a rebuilt trans that is off warrenty but only has 6k on it and it seem like it goes in gear but only creeps i was told a torque conveter that sound right
       
    8. jclaudii

      jclaudii New Member

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      What do I need to replace if fluid is pouring out from the bell housing cover plate after it gets warmed up. After alot of fluid is dumped out it, of course don't shift right. I'm leaning towards the front pump seal. It's a 99 ford explorer with a e engine code. So I believe it is the 5r55e

      Any other ideas?
      Thanks!
       
    9. imp

      imp Well-Known Member

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      2004 XLT
      IMO, only other trans. fluid leak source in that location, other than cracked (unlikely) converter or pump cover seal (not certain if this one uses "O"-ring or gasket (also unlikely to POUR out oil). Front seal most likely culprit.

      A pressure check would be in order, to rule out excessive pressure caused by sticking/stuck pressure control solenoid. NO seal will effectively retain very high pressure......imp
       
    10. blackgtpony

      blackgtpony New Member

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      City, State:
      alabama
      Year and Model:
      1996 4.0 2wd xlt
      96 explorer 2wd od light ias flashing and I have disconnected battery and it still upshifts and down shifts hard after the light comes on @ 40 with od off and 60 with it on p0741 code plz help.
       
    11. valleyboy98

      valleyboy98 New Member

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      City, State:
      water valley ms
      Year and Model:
      98 xlt
      overdrive band

      on my 98 Explorer i adjusted the bands and it started workin. After i shut the truck off it does noth9n cwn anyone help? I tried adjusting ot again and the bolt on the front band never got tight.
       
    12. imp

      imp Well-Known Member

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      Broken band, or strut fell out of place on band. imp
       
    13. valleyboy98

      valleyboy98 New Member

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      City, State:
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      Thanks so thats why its throwin the p1762 dtc
       
    14. Dave422

      Dave422 New Member

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      City, State:
      OK
      Year and Model:
      95 EB
      What about overdrive, my truck is a 95 with 4r55e. Today I changed the filter and fluid, and I adjusted the belt. There was no difference. There is no flashing light or check engine light. I have power at the fuse and at OD switch. Can you give me any suggestions? Thanks, Dave.
       
    15. imp

      imp Well-Known Member

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      That vintage transmission did not yet have the self-diagnosing abilities of the later ones. It lacked several shaft speed sensors, which alert the computer to improper/unexpected rotational speeds relative to one-another-- there are 3 main shafts involved, transmission input, intermediate, and output shaft. Engine speed is already known, and is compared with input shaft to derive, for example, info about Torque Converter Clutch not working properly. Likewise, the others pinpoint failed components like clutches, band, and servos. imp
       
    16. jama321

      jama321 New Member

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      i have a nintey six 4.0 exploer xlt 4 wheel drive. it started haveing slipping problems i changed fluid and filter. dumb guy at az gave me wrong filter. installed and test drove, no reverse. checked fluid wouldnt read on dipstick. i purchased another filter this time it had the circle thing around it like the one i took off. added 2 qts lucas and several castrol high mileage tranmsission fluid. shifts ok but when i put in reverse, it goes in slow and it kinda shakes if u give it a lil gas, what could this be?
       
    17. jeffsawd2000

      jeffsawd2000 New Member

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      City, State:
      Long Island NY
      Year and Model:
      2000 XLT AWD 5.0
      Weird Problem - noisy pump maybe?

      I replaced the engine in my 2000 XLT 5.0 recently. Long story short, the truck sat in the driveway for 4 months before I put the new engine in. Alot of the tranny fluid drained out when I pulled the dipstick tube from the hole. Once I got the motor running I tried putting it in gear and nothing. Remembering the leak I added about 2.5 quarts of fluid and still nothing. I thought the screeching/howling sound under the truck was coming from the motor somewhere but after reading your question above, I went and listened again and would bet it was the tranny but am not 100% positive, only 99.995%. Another weird thing - when trying any of the gears, the motor revs actually increased rather then drop when the tranny engaged. The truck has about 187K on it; not sure about the tranny. It was working great when the motor died. Any ideas? Thanks.
       
    18. XXXWILD1XX

      XXXWILD1XX New Member

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      City, State:
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      Year and Model:
      2000 Ford Explorer

      To me it sounds like you may have broken the pump on the transmission. This can happen when changing the motor. The torque converter not being properly pushed in and when the motor and tranny were being bolted up could have cause you to brake the pump. I hope this helps some without hearing the actual noise it is hard to diagnose.
       
    19. XXXWILD1XX

      XXXWILD1XX New Member

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      City, State:
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      If your vehicle has quite a few miles on it when you change the filter and fluid you actually may have caused more problems then you fixed.
       
    20. Greetingsbatman

      Greetingsbatman New Member

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      City, State:
      wahiawa hi.
      Year and Model:
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      I have a 95 explorer. I hit a dip pretty good and drove home fine, but the next day I got 4 miles away from my house when it wouldn't move forward. It moved with high Rpm but at a snails pace. No burning smell from trans oil, trans oil is clean and red, and no drips, trans oil level is fine too. Any suggestions?
       
    21. rlquick

      rlquick New Member

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      1996 Mazda B4000 4x4

      Great Forum and info here!!
      I am told my Mazda has the ford transmission. When you first start it, it will not go into reverse for 30 seconds or so, when it does it is usually with a jerk. It does not do this after it has warmed up. Also, sometimes when shifting up as you first start driving, you can tell it does not shift correctly, and indicator light starts flashing. If I shut it down and restart it, it works perfect.

      I have heard it may simply be a sensor that determines what gear it is in.??

      ANY Clues???

      Thanks for ANY help
       
    22. Lbcmatt

      Lbcmatt New Member

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      City, State:
      Long beach ca
      Year and Model:
      2001 ford ranger 3.0
      2001 ranger AAMCO problems

      My 2001 ford ranger lost reverse then 1235 I took it to Aamco who told me my reverse band broke because my bearings went out also had a crack in Transmision case and the torque converter was full up metal pieces from reverse band. So I put up the 1900.00 to fix it. Btw this transmision had been rebuilt in September 2013 by the same Aamco. Ok back to now I got the truck back had it for less than a week when the same thing hPpened I lost reverse. Took it back to aamco they had put the wrong size transmission case on. So I get it back for the second time and the od light starts blinking again I call aamco and he tells me to drive it for a few days to see what happens. Wtf why is this happening
       
    23. JK080

      JK080 Transmission Moderator Staff Member Moderator Elite Explorer

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      Maybe find a different Aamco, they can repair it under warranty. I never heard of a wrong size case, sounds like a manager just telling you something because they don't know what happened. Any shop is only as good as the people who work there. Good luck.
       

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