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Triston
Triston, MASTER ASE CERTIFIED
Category: Chevy
Satisfied Customers: 1538
Experience:  10 YRS. EXP. ASE CERTIFIED SPECIALIZE IN ALL ELECTRICAL AND A/C ALSO AND ENGINE PERFORMANCE
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how to disassemble 5LM60 transmision

Customer Question

92 chevy pickup,4.3 v6. needs syncros in 1st 2nd and 3rd gears having problem getting trans apart
Submitted: 5 years ago.
Category: Chevy
Expert:  Triston replied 5 years ago.

this is all the info i have. good luck. please accept my answer. thanks T-MAN

 

 

MUNCIE 5LM60 (HM-290) 4 & 5 Speed
Notes

Fig. 1 Two Wheel Drive Transmission Gear Components

Fig. 2 Two Wheel Drive Transmission Shift Mechanism And Case Components

Fig. 5 Installation Of Holding Fixture

  1. Remove idler shaft support bolt (311) and bottom two bolts. Refer to Figs. 1 and 2 to aid in disassembly and assembly of transmission.
  2. Install holding fixture tools as shown in Fig. 5.
  3. Remove back-up lamp switch assembly.
  4. Remove bolt (317) and electronic speed sensor assembly (314).
  5. Remove detent plug (245) using plug remover tool No. J-36509 and No. J-23907 or equivalents, then remove spring (244) and plunger (243).
  6. Remove two bolts (236), detent spring cover (325), springs (324) and balls (323).
  7. Position unit vertically and remove six bolts (204) and input shaft retainer assembly (205). Save input bearing retainer washer (208).
  8. Remove selective snap ring (210), input shaft spacer (211), ball bearing inner race (215) and shim (212), then position horizontally.
  9. Remove front housing to rear housing bolts (312) and drive dowels (321) from front housing, then remove front housing (200).
  10. Remove countershaft bearing (203).
  11. Remove ball bearing inner race (217) and roller bearing (218).
  12. Remove idler shaft support (310) and four rollers (118), then remove roll pin (120) by pulling shift shaft forward and cocking it to detent cover side. Support shift shaft end while driving out finger roll pin. Slide shaft all the way back and cock over to detent spring cover side.
  13. Remove shift shaft socket assembly roll pin (122). Pin will fall into case. Do not use excessive force as this will ``peen'' shift shaft and damage rear housing shift shaft bearing, causing increased shift effort.
  14. Remove shift shaft (116), shift shaft socket assembly (123) and finger (121).
  15. Remove 3rd and 4th shift fork roll pin (107) using large pair of diagonal cutters to pry it out. If roll pin (107) breaks off, place transmission in 3rd gear, cut off remainder of roll pin and drive through.
  16. Remove plug (326) by hitting it on one side, thus cocking it.
  17. Remove 3rd & 4th rail (109) as follows:
    1. Ensure 1-2 and 5-reverse rails are in neutral.
    2. Drive through the plug hole (326) enough to expose roll pin hole (107), then insert punch and pull out shift rail while twisting it.

Fig. 6 Removing & Installing Special Tools

Fig. 7 Removing Two Wheel Dirve Rear Housing

Fig. 8 Removing Speed Sensor Rotor

Fig. 9 Removing Threaded Thrust Rings

  1. Install assembly pallet with countershaft adapter tool No. J-36515 with tool No. J-36515-12, Fig. 6 and remove tool No. J-8763-02 and tool No. J-36824. Remove two interlock balls (323).
  2. Remove bolts (304) and (305).
  3. Remove rear housing assembly Fig. 7.
  4. Remove output shaft bearing retainer (302).
  5. Remove shim (212). Lock up transmission in 2nd and 4th gear by sliding 1st-2nd rail assembly (100) and 3rd-4th shift fork (108) downward towards assembly pallet tool No. J-36515. Slide snap ring (43), Fig. 8 and washer away from rotor to make clearance for speedometer gear puller adapter tool No. J-21427-01.
  6. Remove speed sensor rotor (45) using tool speedometer gear puller adapter tool No. J-21427-01 and gear puller tool No. J-8105, Fig. 8 . Do not reuse rotor after removal.
  7. Remove washer (44) and snap ring (43).
  8. Remove spiral roll pin (42) using output shaft spanner tool No. J-36516, Fig. 9.
  9. Remove snap ring (43), then threaded inner thrust ring (41), ball (40) and outer threaded thrust ring (39). Hold countershaft against mainshaft and turn output shaft spanner tool No. J-36516 clockwise until both threaded thrust rings are completely apart.
  10. Remove reverse idler gear assembly (46) and (54) (4 speed models) or (53) (5 speed models).
  11. Remove 1-2 shift rail assembly (100), 5-reverse shift rail assembly (111), 3-4 shift fork (108) and (4 speed) spacer block (115).
  12. Remove mainshaft assembly (4). Leave synchronizer ring (2) on the 3-4 synchronizer (7) to prevent synchronizer detent balls from popping out.
  13. Remove input shaft gear (1) and pilot bearing (3).
Triston, MASTER ASE CERTIFIED
Category: Chevy
Satisfied Customers: 1538
Experience: 10 YRS. EXP. ASE CERTIFIED SPECIALIZE IN ALL ELECTRICAL AND A/C ALSO AND ENGINE PERFORMANCE
Triston and 9 other Chevy Specialists are ready to help you
Customer: replied 5 years ago.
Can't see pictures
Expert:  Triston replied 5 years ago.
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1992 Chevy Truck S10/T10 P/U 2WD V6-262 4.3L VIN Z

Vehicle Level Transmission and Drivetrain Manual Transmission/Transaxle Service and Repair Overhaul Disassemble MUNCIE 5LM60 (HM-290) 4 & 5 Speed
MUNCIE 5LM60 (HM-290) 4 & 5 Speed
Notes

Fig. 1 Two Wheel Drive Transmission Gear Components

Fig. 2 Two Wheel Drive Transmission Shift Mechanism And Case Components

Fig. 5 Installation Of Holding Fixture

  1. Remove idler shaft support bolt (311) and bottom two bolts. Refer to Figs. 1 and 2 to aid in disassembly and assembly of transmission.
  2. Install holding fixture tools as shown in Fig. 5.
  3. Remove back-up lamp switch assembly.
  4. Remove bolt (317) and electronic speed sensor assembly (314).
  5. Remove detent plug (245) using plug remover tool No. J-36509 and No. J-23907 or equivalents, then remove spring (244) and plunger (243).
  6. Remove two bolts (236), detent spring cover (325), springs (324) and balls (323).
  7. Position unit vertically and remove six bolts (204) and input shaft retainer assembly (205). Save input bearing retainer washer (208).
  8. Remove selective snap ring (210), input shaft spacer (211), ball bearing inner race (215) and shim (212), then position horizontally.
  9. Remove front housing to rear housing bolts (312) and drive dowels (321) from front housing, then remove front housing (200).
  10. Remove countershaft bearing (203).
  11. Remove ball bearing inner race (217) and roller bearing (218).
  12. Remove idler shaft support (310) and four rollers (118), then remove roll pin (120) by pulling shift shaft forward and cocking it to detent cover side. Support shift shaft end while driving out finger roll pin. Slide shaft all the way back and cock over to detent spring cover side.
  13. Remove shift shaft socket assembly roll pin (122). Pin will fall into case. Do not use excessive force as this will ``peen'' shift shaft and damage rear housing shift shaft bearing, causing increased shift effort.
  14. Remove shift shaft (116), shift shaft socket assembly (123) and finger (121).
  15. Remove 3rd and 4th shift fork roll pin (107) using large pair of diagonal cutters to pry it out. If roll pin (107) breaks off, place transmission in 3rd gear, cut off remainder of roll pin and drive through.
  16. Remove plug (326) by hitting it on one side, thus cocking it.
  17. Remove 3rd & 4th rail (109) as follows:
    1. Ensure 1-2 and 5-reverse rails are in neutral.
    2. Drive through the plug hole (326) enough to expose roll pin hole (107), then insert punch and pull out shift rail while twisting it.

Fig. 6 Removing & Installing Special Tools

Fig. 7 Removing Two Wheel Dirve Rear Housing

Fig. 8 Removing Speed Sensor Rotor

Fig. 9 Removing Threaded Thrust Rings

  1. Install assembly pallet with countershaft adapter tool No. J-36515 with tool No. J-36515-12, Fig. 6 and remove tool No. J-8763-02 and tool No. J-36824. Remove two interlock balls (323).
  2. Remove bolts (304) and (305).
  3. Remove rear housing assembly Fig. 7.
  4. Remove output shaft bearing retainer (302).
  5. Remove shim (212). Lock up transmission in 2nd and 4th gear by sliding 1st-2nd rail assembly (100) and 3rd-4th shift fork (108) downward towards assembly pallet tool No. J-36515. Slide snap ring (43), Fig. 8 and washer away from rotor to make clearance for speedometer gear puller adapter tool No. J-21427-01.
  6. Remove speed sensor rotor (45) using tool speedometer gear puller adapter tool No. J-21427-01 and gear puller tool No. J-8105, Fig. 8 . Do not reuse rotor after removal.
  7. Remove washer (44) and snap ring (43).
  8. Remove spiral roll pin (42) using output shaft spanner tool No. J-36516, Fig. 9.
  9. Remove snap ring (43), then threaded inner thrust ring (41), ball (40) and outer threaded thrust ring (39). Hold countershaft against mainshaft and turn output shaft spanner tool No. J-36516 clockwise until both threaded thrust rings are completely apart.
  10. Remove reverse idler gear assembly (46) and (54) (4 speed models) or (53) (5 speed models).
  11. Remove 1-2 shift rail assembly (100), 5-reverse shift rail assembly (111), 3-4 shift fork (108) and (4 speed) spacer block (115).
  12. Remove mainshaft assembly (4). Leave synchronizer ring (2) on the 3-4 synchronizer (7) to prevent synchronizer detent balls from popping out.
  13. Remove input shaft gear (1) and pilot bearing (3).

 

 

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