Assembly
BEARING AND SEAL REPLACEMENTFig. 53:
1. Using Remover C-4210 and Handle C-4171, drive input shaft bearing from case from inside annulus gear opening (Fig. 53).
2. Install locating ring on new bearing.
3. Position case so that the forward end is facing upward.
Fig. 54:
4. Using Remover C-4210 and Handle C-4171, drive input shaft bearing into case. The bearing locating ring must be fully seated on case (Fig. 54).
5. Using Installer 6953, remove front output shaft bearing.
Fig. 55:
6. Start front shaft output bearing in case (Fig. 55). Then seat bearing with Handle C-4171 and Installer 6953.
7. Install front output bearing retaining ring.
8. Install new front output seal in NV241LD front case with Installer Tool 6888 and Tool Handle C-4171 as follows:
a. Place new seal on tool. Garter spring on seal goes toward interior of case.
Fig. 56:
b. Start seal in bore with light taps from hammer (Fig. 56). Once seal is started, continue tapping seal into bore until installer tool bottoms against case.
Fig. 57:
c. Remove installer and verify that seal is recessed the proper amount (Fig. 57). Seal should be 2.03 to 2.5 mm (0.080 to 0.100 inch) below top edge of seal bore in front case. This is correct final seal position.
CAUTION: Be sure the front output seal is seated below the top edge of the case bore as shown. The seal could loosen, or become cocked if not seated to recommended depth.
9. Install new front output seal in NV231HD front case with Installer Tool 8143 as follows:
a. Place new seal on tool. Garter spring on seal goes toward interior of case.
Fig. 58:
b. Start seal in bore with light taps from hammer (Fig. 58). Once seal is started, continue tapping seal into bore until installer tool seats against case.
10. Remove seal from front bearing retainer with suitable pry tool.
Fig. 59:
11. Install new oil seal in front bearing retainer with Installer 7884 (Fig. 59).
12. Remove seal from oil pump with suitable pry tool.
Fig. 60:
13. Install new seal in oil pump with Installer 7888 (Fig. 60).
Fig. 61:
14. Remove input gear pilot bearing by inserting a suitably sized drift into the splined end of the input gear and driving the bearing out with the drift and a hammer (Fig. 61).
15. Install new pilot bearing with Plug C-293-3.
Fig. 62:
16. Remove the output shaft rear bearing with the screw and jaws from Remover L-4454 and Cup 8148 (Fig. 62).
Fig. 63:
Fig. 64:
17. Install new bearing with Tool Handle C-4171 and Installer 5066 (Fig. 63). The bearing bore is chamfered at the top. Install the bearing so it is flush with the lower edge of this chamfer (Fig. 64).
INPUT AND PLANETARY GEAR ASSEMBLY
Fig. 65:
1. Lubricate gears and thrust washers (Fig. 65) with recommended transmission fluid.
2. Install first thrust washer in low range gear (Fig. 65). Be sure washer tabs are properly aligned in gear notches.
3. Install input gear in low range gear. Be sure input gear is fully seated.
4. Install remaining thrust washer in low range gear and on top of input gear. Be sure washer tabs are properly aligned in gear notches.
5. Install retainer on input gear and install snap ring.
INPUT AND PLANETARY GEAR INSTALLATION
Fig. 66:
1. Align and install low range/input gear assembly in front case (Fig. 66). Be sure low range gear pinions are engaged in annulus gear and that input gear shaft is fully seated in front bearing.
Fig. 67:
2. Install snap-ring to hold input/low range gear into front bearing (Fig. 67).
3. Clean gasket sealer residue from retainer and inspect retainer for cracks or other damage.
4. Apply a 3 mm (1/8 inch) bead of Mopar gasket maker or silicone adhesive to sealing surface of retainer.
5. Align cavity in seal retainer with fluid return hole in front of case.
CAUTION: Do not block fluid return cavity on sealing surface of retainer when applying Mopar@ gasket maker or silicone adhesive sealer. Seal failure and fluid leak can result.
Fig. 68:
6. Install bolts to hold retainer to transfer case (Fig. 68). Tighten to 21 Nm (16 ft. lbs.) of torque.
MAINSHAFT ASSEMBLY
1. Lubricate mainshaft splines with recommended transmission fluid.
2. Slide drive sprocket onto mainshaft.
3. Slide mode hub onto mainshaft.
4. Install mode hub retaining ring. Verify that the retaining ring is fully seated in mainshaft; groove.
SHIFT FORKS AND MAINSHAFT INSTALLATION
1. Support front case on wood blocks so case interior is facing up. Place blocks between mounting studs on forward surface of case. Be sure blocks will not interfere with input gear installation.
2. Lubricate mainshaft components with Dexron II transmission fluid.
Fig. 69:
3. Lubricate sector shaft with transmission fluid and install shift sector in case (Fig. 69). Position slot in sector so it will be aligned with shift fork pin when shift forks are installed.
Fig. 70:
4. Assemble and install range fork and hub (Fig. 70). Be sure hub is properly seated in low range gear and engaged to the input gear.
5. Align and insert range fork pin in shift sector slot.
Fig. 71:
6. Install assembled mainshaft (Fig. 71). Be sure shaft is seated in pilot bearing and input gear.
7. Install new pads on mode fork if necessary.
Fig. 72:
8. Insert mode sleeve in mode fork mode fork. Be sure long side of sleeve is toward long end of shift rail (Fig. 72).
Fig. 73:
9. Install assembled mode fork and sleeve (Fig. 73). Be sure fork rail goes through range fork and into case bore. Also be sure sleeve is aligned and seated on mainshaft hub.
Fig. 74:
10. Install vacuum/indicator switch (Fig. 74) Tighten switch to 20 - 34 Nm (15 - 25 ft. lbs.) torque. Install new O-ring on switch beforehand, if necessary.
Fig. 75:
11. Install new sector shaft O-ring and O-ring retainer in sector shaft bore (Fig. 75). Lubricate O-ring with transmission fluid or petroleum jelly after installation.
Fig. 76:
12. Install shift lever on sector shaft (Fig. 76).
13. Install washer and nut on sector shaft to secure shift lever. Apply 1-2 drops Mopar Lock N' Seal, or equivalent, to nut threads before installation. Then tighten nut to 27 - 34 Nm (20 - 25 ft. lbs.) torque.
Fig. 77:
14. Install poppet plunger and spring (Fig. 77).
Fig. 78:
15. Install new O-ring on poppet screw and install screw in front case (Fig. 78). Tighten screw to 16 - 24 Nm (12 - 18 ft. lbs.).
FRONT OUTPUT SHAFT AND DRIVE CHAIN INSTALLATION
Fig. 79:
1. Install front output shaft in bearing (Fig. 79).
Fig. 80:
5. If mainshaft and mode sleeve were unseated during chain installation, align and reseat mainshaft in input gear and hub.
Fig. 81:
6. Install front sprocket retaining ring (Fig. 81).
Fig. 82:
7. Install spring and cup on shift rail (Fig. 82).
Fig. 83:
8. Insert magnet in front case pocket (Fig. 83).
OIL PUMP AND REAR CASE ASSEMBLY/INSTALLATION
Lubricate the oil pump components with Dexron II before installation. Prime the oil pickup tube by pouring a little oil into the tube before installation.
Fig. 84:
1. Install new O-ring in pickup tube inlet of oil pump (Fig. 84).
Fig. 85:
2. Position oil pickup tube and filter in rear case. Be sure pickup filter is seated in case pocket and that pickup tube is aligned in case notches (Fig. 85). Be sure hose that connects tube to filter is securely positioned.
Fig. 86:
3. Insert oil pickup tube in oil pump and position pump in rear case (Fig. 86).
4. Apply bead of Mopar Gasket Maker, or equivalent, to mating surface of front case. Keep sealer bead width to maximum of 3/16 inch. Do not use excessive amount of sealer as excess will be displaced into case interior.
Fig. 87:
5. Align oil pump with mainshaft and align shift rail with bore in rear case. Then install rear case and oil pump assembly (Fig. 87). Be sure oil pump and pickup tube remain in position during case installation.
6. Install 4-5 rear case-to front case bolts to hold rear case in position. Tighten bolts snug but not to specified torque at this time.
Fig. 88:
CAUTION: Verify that shift rail (Fig. 88), and case alignment dowels are seated before installing any bolts. Case could be cracked if shaft rail or dowels are misaligned.
7. Verify that oil pump is aligned and seated on rear case. Reposition pump if necessary.
Fig. 89:
8. Check stud at end of case halves (Fig. 89). If stud was loosened or came out during disassembly, apply Loctite 242 to stud threads and reseat stud in case.
9. Apply Loctite 242 to remainder of rear case-to-front case bolt threads and install bolts. Be sure lock washers are used on studs/bolts at case ends. Tighten bolts, or stud nuts as follows:
^ flange head bolts to 47 - 61 Nm (35 - 45 ft. lbs.)
^ all other bolts/nuts to 27 - 34 Nm (20 - 25 ft. lbs.)
Fig. 90:
10. Install oil pump retaining ring on mainshaft (Fig. 90).
11. Install rear output bearing and snap ring to output shaft.
COMPANION FLANGE INSTALLATION
Fig. 91:
1. Install companion flange seal on front shaft (Fig. 91).
Fig. 92:
2. Install companion flange on front shaft (Fig. 92). Then install and tighten flange nut to 176 - 271 Nm (130 - 200 ft. lbs.) torque.
REAR RETAINER AND EXTENSION INSTALLATION
1. Clean mating surfaces of transfer case housing and the rear retainer of any original gasket material.
2. Install new rear retainer gasket onto the transfer case housing or rear retainer.
Fig. 93:
3. Align and install rear retainer on rear case (Fig. 93).
4. Apply Mopar silicone sealer to threads of rear retainer bolts. Then install retainer bolts finger tight.
Fig. 94:
5. Install output bearing on mainshaft and seat it in rear retainer with suitable size pipe tool (Fig. 94).
Fig. 95:
6. Install output bearing retaining ring (Fig. 95).
7. Tighten rear retainer bolts to 27 - 34 Nm (20 - 25 ft. lbs.) torque.
8. Install new seal in rear extension with suitable size installer tool.
9. Apply bead of Mopar Gasket Maker, or equivalent, to mating surface of rear extension. Keep sealer bead width to maximum of 3/16 inch. Do not use excessive amount of sealer as excess could be displaced into output bearing.
Fig. 96:
10. Align and install rear extension on retainer (Fig. 96).
11. Apply Mopar silicone sealer to threads of rear extension bolts. Then install and tighten bolts to 27 - 34 Nm (20 - 25 ft. lbs.) torque.