ISUZU Amigo/Pick-ups/Rodeo/Trooper 1981-1996

Extension Housing Seal

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REMOVAL & INSTALLATION



Except 1991-96 4WD Rodeo and Trooper

See Figures 1, 2 and 3

Although draining the transmission is not necessary for this procedure, it would be a good time for a routine fluid change.

  1. Raise and safely support the vehicle on jackstands.
  2.  
  3. If so desired, drain the transmission fluid.
  4.  
  5. Matchmark the rear driveshaft flange to the rear differential flange for reassembly.
  6.  
  7. Remove the 4 driveshaft retaining bolts from the rear differential.
  8.  
  9. If equipped, remove the center bearing retainer bolts.
  10.  
  11. Lower the rear of the driveshaft assembly down from the differential and pull the rear driveshaft front yoke gently free of the transmission extension housing. Remove the driveshaft assembly completely from the vehicle.
  12.  
  13. If equipped, remove the extension housing dust shield from the transmission.
  14.  
  15. Using an oil seal puller (usually a specially designed J-shaped prytool), remove the rear housing oil seal.
  16.  



Click image to see an enlarged view

Fig. Fig. 1: The extension housing oil seal is pressed into the extension housing tail-except 1991-96 4WD Rodeo and Trooper models



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Fig. Fig. 2: After matchmarking the driveshaft to the differential flange, remove the 4 attaching bolts and nuts



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Fig. Fig. 3: To install the rear extension oil seal with the special tool J-36503, or equivalent-NV1500 transmissions

To install:
  1. Install a new oil seal using an installer tool, such as J-29769 for the MUA-type or J-38763 for the T5R transmissions, or the equivalent. Make certain that the oil seal is seated completely and flush in the rear extension housing bore.
  2.  
  3. Lubricate the inside lip of the fluid oil seal with fresh, clean engine oil.
  4.  
  5. Position the driveshaft assembly under the vehicle, then lift the front end of the driveshaft up and slide it carefully into the rear extension housing of the transmission.
  6.  
  7. If applicable, lift the center bearing up and install the retaining bolts finger-tight. Position the rear driveshaft flange against the differential flange so the matchmarks align and install the attaching bolts and nuts finger-tight. Make sure the driveshaft-to-differential bolts are installed from the backside of the differential flange (the threaded portion of the bolt should be toward the front of the vehicle).
  8.  
  9. If equipped, tighten the center bearing bolts to 45 ft. lbs. (60 Nm).
  10.  
  11. Tighten the driveshaft-to-differential flange bolts and nuts to 46 ft. lbs. (63 Nm).
  12.  
  13. If necessary, install the transmission drain plug and fill the transmission until the fluid just starts to dribble out of the filler hole (make sure the dribble is not a by-product of a sloppy transmission filling technique-spillage while filling). Install the filler plug.
  14.  
  15. Lower the vehicle.
  16.  

1991-96 4WD Rodeo and Trooper

See Figures 2, 4 and 5

These vehicles are equipped with a transmission-to-driveshaft flange; rather than sliding the driveshaft yoke into the rear extension housing, the driveshaft bolts to the transmission flange.

Although draining the transmission is not necessary for this procedure, it would be a good time for a routine fluid change.

  1. Raise and safely support the vehicle on jackstands.
  2.  
  3. If so desired, drain the transmission fluid.
  4.  
  5. Matchmark the rear driveshaft flange to the rear differential flange and the front driveshaft flange to the rear transmission flange for reassembly.
  6.  
  7. Remove the 4 driveshaft retaining bolts from the rear differential.
  8.  
  9. If equipped, remove the center bearing retainer bolts.
  10.  
  11. Remove the 4 driveshaft retaining bolts from the transmission rear flange.
  12.  
  13. Lower the rear of the driveshaft assembly out of the vehicle.
  14.  
  15. Use a rear flange holder, such as J-37221, to hold the rear flange steady while loosening the flange retaining nut.
  16.  
  17. Remove the flange retaining nut and the old O-ring. Discard the O-ring.
  18.  



Click image to see an enlarged view

Fig. Fig. 4: Unlike the other transmissions, the 4WD versions of the MUA-5C and T5R transmissions utilize a transmission flange equipped with a sealing O-ring



Click image to see an enlarged view

Fig. Fig. 5: It will be necessary to hold the flange steady with special tool J-37221, or equivalent, to remove the flange retaining nut

To install:
  1. Install a new O-ring onto the transmission rear flange and install the flange nut.
  2.  
  3. Use the flange holding tool to hold the flange stationary while tightening the flange nut to 123 ft. lbs. (167 Nm).
  4.  
  5. Position the driveshaft assembly under the vehicle, then lift the front end of the driveshaft up and hold it against the transmission flange so the matchmarks align. Install the driveshaft-to-transmission flange bolts and nuts finger-tight.
  6.  
  7. If applicable, lift the center bearing up and install the retaining bolts finger-tight. Position the rear driveshaft flange against the differential flange so the matchmarks align and install the attaching bolts and nuts finger-tight. Make sure the driveshaft-to-differential bolts are installed from the backside of the differential flange (the threaded portion of the bolt should be toward the front of the vehicle).
  8.  
  9. If equipped, tighten the center bearing bolts to 45 ft. lbs. (60 Nm).
  10.  
  11. Tighten the driveshaft-to-differential flange and driveshaft-to-transmission flange bolts and nuts to 46 ft. lbs. (63 Nm).
  12.  
  13. If necessary, install the transmission drain plug and fill the transmission until the fluid just starts to dribble out of the filler hole (make sure the dribble is not a by-product of a sloppy transmission filling technique-spillage while filling). Install the filler plug.
  14.  
  15. Lower the vehicle.
  16.  

 
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