gsbarry
Well-Known Member
- Joined
- August 6, 2008
- Messages
- 157
- Reaction score
- 12
- City, State
- Houston, TX
- Year, Model & Trim Level
- Stock 97 4.0 EB SOHC
Diagnosis
This thread started out as a diagnosis challenge, but has evolved into a rebuild guide of sorts. The rebuild section begins on the 2nd page, once I determined removal was necessary (i.e. not band adjustment or valve body issue). It is not quite as detailed as Glacier's A4LD rebuild, which is a good idea to read as well, but covers the main points with a lot of photos. The removal is fairly brief, but I did cover a few tricks on the re-install.
VEHICLE: 97 4.0 SOHC 4X4
TRANS: 5R55E
CURRENT MILEAGE: 190,000
TRANS HISTORY: Complete rebuild in 2005 at 125,000 miles; transgo jr. shift kit also installed; partial rebuild in 2006 at 129,000 miles - replaced reverse band, OD sprag and planetary
CURRENT SYMPTOM PROGRESSION: initially exhibited intermittent 2-3 shift flare which quickly worsened to regular occurence; next trans then exhibited only very slight engagement in D and R (high rpm's yielded very slight movement of vehicle); however manual 1 and manual 2 function correctly; no OBD codes
FLUID CONDITION: fluid level and color appear normal; no significant leaks detected; 45,000 miles since last fluid change
INITIAL THOUGHTS: based on the progression of symptoms (and extensive research on EF) it seems to me that the likely culprit is (in order of likelihood) something in the valve body, possibly a failing D/R servo, possibly a failing/failed reverse band
:roll:
QUESTIONS: 1) does the fact that manual 1 and manual 2 function correctly (but D and R only slightly engaging) point to one malfunction/failure in particular? 2) the progression from the 2-3 flare to the more significant D/R partial engagement indicates to me a valve body failure, thoughts?
:roll:
PLAN FOR REPAIR: have not yet removed pan, plan to remove and inspect valve body for obvious problems; either replace certain components or shotgun with a reman valve body; if no success proceed to servo inspection/replacement; if no success drop trans and rebuild/replace hard parts as necessary; initial rebuilds were done at shops, plan to do this myself, don't have the specific trans tools yet for rebuild so trying to minimize cost
This thread started out as a diagnosis challenge, but has evolved into a rebuild guide of sorts. The rebuild section begins on the 2nd page, once I determined removal was necessary (i.e. not band adjustment or valve body issue). It is not quite as detailed as Glacier's A4LD rebuild, which is a good idea to read as well, but covers the main points with a lot of photos. The removal is fairly brief, but I did cover a few tricks on the re-install.
VEHICLE: 97 4.0 SOHC 4X4
TRANS: 5R55E
CURRENT MILEAGE: 190,000
TRANS HISTORY: Complete rebuild in 2005 at 125,000 miles; transgo jr. shift kit also installed; partial rebuild in 2006 at 129,000 miles - replaced reverse band, OD sprag and planetary
CURRENT SYMPTOM PROGRESSION: initially exhibited intermittent 2-3 shift flare which quickly worsened to regular occurence; next trans then exhibited only very slight engagement in D and R (high rpm's yielded very slight movement of vehicle); however manual 1 and manual 2 function correctly; no OBD codes
FLUID CONDITION: fluid level and color appear normal; no significant leaks detected; 45,000 miles since last fluid change
INITIAL THOUGHTS: based on the progression of symptoms (and extensive research on EF) it seems to me that the likely culprit is (in order of likelihood) something in the valve body, possibly a failing D/R servo, possibly a failing/failed reverse band
:roll:
QUESTIONS: 1) does the fact that manual 1 and manual 2 function correctly (but D and R only slightly engaging) point to one malfunction/failure in particular? 2) the progression from the 2-3 flare to the more significant D/R partial engagement indicates to me a valve body failure, thoughts?
:roll:
PLAN FOR REPAIR: have not yet removed pan, plan to remove and inspect valve body for obvious problems; either replace certain components or shotgun with a reman valve body; if no success proceed to servo inspection/replacement; if no success drop trans and rebuild/replace hard parts as necessary; initial rebuilds were done at shops, plan to do this myself, don't have the specific trans tools yet for rebuild so trying to minimize cost