Slip Yoke Eliminator - Omix-Ada
Contents
1. Slip Yoke Eliminator Kit For NP231 Part Number 11400 KIT CONTAINS Rear Output Housing w plug Rear Output Bearing Rear Output Seal Rear Output Yoke and nut Main Output Shaft Speedometer Drive Gear Snap Ring for Speedometer Gear QTY 2 Rear Output Bearing Snap Ring Snap Ring for Mode Gear Front Output Spline Seal Rear Output Spline Seal NOTE Some early NP231 produced from 1987 1990 have the vacuum switch for the front axle disconnect housed in the rear output shaft housing This kit is supplied with a new housing that does not allow for the vacuum switch to be reused for this applications It will be necessary to purchase a cable operated disconnect manufactured by 4x4 Posi Lock or replace the front passenger side axles with later solid axle shafts The purpose of this kit is to replace the slip yoke portion of the NP231 with a fixed yoke CV style drive shaft assembly A CV equipped drive shaft will be required with this conversion kit The stock drive shaft can be modified to work Proper length and balance are critical High quality drive shafts in the required lengths and configurations are available to compliment this kit for many applications The easiest way to install this kit is to remove the transfer case from your Jeep Removal is not necessary but usually is much quicker and easier Installation of this kit requires almost total disassembly of your transfer case Several suggestions that may help Pg 1 1 The instal2. inner snap ring on the shaft and the bearing retainer ring Remove the output housing bolts and then remove the existing output assembly i Photo 1 NP231 after completion of the first four steps of the disassembly process The oil pump pickup tube may need to be removed before the case halves can be split Pg 2 STEP 5 Mark the locations of the rear case half bolts before removing them Start the case separation process by using the cast in pry bar location slots only Prying anywhere else on the case halves may create an uneven surface that will not seal properly later Carefully begin to pry the case halves apart Some models will be able to remove the pickup tube and pump assembly with the rear case NOTE Inspect the pickup tube o ring and the front shaft seal in the pump Do not take the pump apart it is not serviceable aw ow 3 Photo 2 231 with the rear case and oil pump assembly removed Clean and inspect all parts STEP 6 Remove the front output shaft Remove the chain from the main shaft Clean and inspect the chain and gears STEP 7 Remove the main shaft from the front case Make note of the locations of the snap rings mode hub and sprocket of these items will be positioned on the new shaft NOTE On many earlier models the sprocket used a caged needle bearing This bearing will need to be removed in order for the sprocket to be installed on the new
3. 12612 01 pn 1961201 Fen 12676 51 1650 53 pin 1970101 Bre 1867661 Fen 12677 01 Pen 12676 02 Pen 12076 04 12076 71 12076 73
4. FROM TOU TPUT YORE WASHER 1997 95 WEAH GLER YORE STRAP amp BOLT KIT 1997 95 WEAHGLER FRONT OUTPUT OUTPUT MAINDRIVE SPROCKET BEARING 2 needed 1997 89 WRANGLER MANDRIVE SPROCKET BEARING 2 needed 1991 95 WRANGLER MAHD RIVE 1967 95 WEAH GLEF OIL PUMP HOUSING OIL SEAL 1997 99 WRANGLER OIL PUME HOUSING amp OIL SEAL 1987 99 WEAH GLEF REAR OUTPUT SHAFT OUTER BEARING 1997 99 WEAH GLEE OUTPUT SHAFT FRONT BEARING 1937 99 WEAH GLER FROM T OUTPUT SHAFT 1987 99 WEAH CLEF HEW PROCESS 2231 1987 04 VREANGLER HEW PROCESS 231 1987 01 CHEROKEE HEW PROCESS 231 1993 96 GRAND CHEROKEE OUTPUT SHAFT REAR BEARING 1937 99 WRANGLER REAR OUTPUT SHAFT SLIP YORE 1937 93 WRANGLER SILICONE TUBE use as gasket YORE FOR SLI YOKE ELIMINATOR EIT SPEEDO GEAR HEW PROCESS 241 0 ODGEPICE UP OIL SEAL USED IH SLIP ELIMINATOR EITIN HP221 SPARE HARDWARE EITFOR 1967660 SLIP SPEED SENSOR FOR 18676 72 MEGA SHORT EIT FEMALE COUPLING FOR 1998 OLDER HP231 SHAFT BEARING FETANER pin 19676 29 pin 14676 30 pin 19676 21 pin 19676 22 pin 1867649 ph 1867633 pin 1967624 pin 18476 35 pin 1207636 1 676 39 pin 12076 39 19076 37 LEGTG 3 Pen 1807840 Bim 16532 03 Pen 12076 41 pin 12878 42 En 18074 12076844 pn 19076 45 19070 46 Pen 12676 47 12076 42 pn 19076 45 1676 50 1261201 pin
5. LER pn 19676 12 DRIVE SPROCKET 1997 09 WRANGLER pn 1267613 VACCUM SWITCH 1987 93 WRANGLER pin 12676 14 ELECTRICAL WD SWITCH 1997 02 WRANGLER pn 18676 15 CASE DOWEL needed 1987 99 WRANGLER pic 1967616 RANGE SHIFT FORK 1997 99 WRANGLER EXCEPT 53008210 11 12 UMITS ph 1967617 RANGE SHIFT FORE BUSHING aneeded 1987 93 WEAH GLER pin 1867612 SHIFT MODE S HCHREONIZER ASSEMBLY 1987 03 WRAN GLER blockingring pn 1867619 RANGE SHIFT HUE 1927 89 WRANGLER pin 19676 20 RANGE SHIFT HUB 1999 95 WRANGLER pin 1867621 RANGE SHIFT HUB 1997 99 WRANGLER pin 18676 27 RANGE SHIFT FORE PAD SET 1987 90 WRANGLER 18676 23 RANGE SHIFT FORE PAD 1991 99 WRANGLER pin 18676 24 HOUSHG CASE PEAR EXTENTION 1987 05 WEAH GLER ph 19676 25 MODE SHIFT FORE 1987 93 WRANGLER pn 19676 26 MODE SHIFT FORE 1997 99 WRANGLER 19676 27 MAINSHAFT REAP BUSHING 1987 95 WRANGLER pin 1967628 MODE SHIFT FORE PAL EIT 1867624 8 OUTPUT SHAFT REAR OIL SEAL 1957 95 WRANGLER SHIFT MODE SELECTOR 1997 89 WEAH GLER SHIFT MODE SELECTOR 1991 93 WRANGLER SHIFT MODE SELECTOR 1997 99 WRANGLER MODE SHIFT FORE BUSHING 1937 95 WRANGLER SELECTOR SHAFT 0 FHG SELECTOR SHAFT SEAL SHIFT MODE SYHCHEO HEEF BLOCEING EHG 1957 93 WEAH GLEF FRONT OUTPUT YORE HOT 1937 99 WRANGLER FROHT OUTPUT YORE CHERO REE FROWN TOU TPUT YORE GRAND CHEROEEE FROM T OUTPUT YORE 1987 95 WRANGLER FROH TOUTPUT YORE 1997 9 WRANGLER
6. case half Be sure to index and align the pump outer tabs with the housing Interference between the shift rail and the housing will indicate whether or not you need to trim the shift rail STEP 14 Prelube bearing and seal and install them into the rear output housing Be sure to install the bearing retaining ring into the housing STEP 15 Apply sealant to rear output housing Be sure to support the main shaft and index the pump outer tabs while aligning and installing the rear output assembly You can gently pull back on the output shaft to seat it against the rear bearing Install the rear output housing bolts and torque to 20 25 ft Ibs Pg 5 STEP 16 Front and rear output yoke seal and washer installation Slide the yoke seals provided in the kit into position Prelube the surfaces on the yokes where both the inner and outer seals will be Slide the yokes on and tighten the retaining nuts to 140 150 ft lbs STEP 17 Install the speedometer drive housing into the new output housing Refer to the marks you made in step 2 for proper location The housing needs to be positioned in one of four rotation positions depending upon speedometer gear tooth count Proper positioning can also be determined by rotating the speedometer housing until proper engagement is achieved Be sure to place a small amount of RTV sealant around the housing o ring STEP 18 Reinstall the transfer case into the vehicle Be sure to fill it to the recommended level w
7. cle requires recalibration a converter box be purchase Not Available from Omix Ada Rugged Ridge Speedometer Reading Related to Gear Ratio and Tire Size Axle 5 36 f D 9 14 17 20 24 75 25 27 Tae 1 14 19 19 20 21 14 on Tf IE 10 va Snol l O 5 07 l 51 40 37 35 33 32 SI 30 29 28 27 Pg 7 Fe let bel bo bo Lr 4 4 4 4 a NP231J Parts List INFUTBEARING EIT 1987 95 WEAH GLER bearing amp al pn 1267601 INFUTBEARING RETAINER SEAL 1987 90 WRANGLER pin 1847602 INFUTBEARING RETAINER SEAL 1990 99 WRANGLER 1867643 INFUT GEAR OUTER BEARING 1987 95 WRANGLER pin 18676 04 GEAR OUTER BEARING 1997 09 WRANGLER pn 18676 05 INFUT GEAR 23 SPLINE 1987 29 AUTOMATIC WRANGLER inchides bearing pin 1967606 INFUT GEAR 25 SPLINE WRANGLER WICASE K S 3008210 52097893 OF 52098042 UNITS pac 1867607 INFUT GEAR 23 SPLINE CHEROKEE WICASE A S 3008210 52097893 OR 52098048 UNITS pac 1867647 INFUT GEAR 21 SPLINE WRANGLER 1867608 GEAR 21 SPLINE CHEROEEE pin 1967608 INFUT GEAR 23 SPLINE WRANGLER ph 19676 09 GEAR 25 SPLINE CHEROKEE pin 1967609 INFUT GEAR 25 SPLINE GRAND CHEROKEE 18076 09 INFUT GEAR 23 SPLINE GRAND CHEROKEE Wi 52097526 CASE pin 12676 10 INFUT GEAR INNER BEARING 1987 99 WEAH GLER pr 1257611 DRIVE SPROCKET 1987 03 WRANG
8. ith the proper fluid Reconnect all the required items like the front drive shaft shift linkages speedometer wiring or cable etc Take measurements for the required CV equipped rear drive shaft Measure a straight line from the transfer case rear output yoke to the rear pinion yoke to determine the required length of your new driveshaft Transfer Case Output Measure Drive shaft modifications to Original Unit The modification of your drive shaft should be performed by a local driveline repair shop that is capable of balancing your finished assembly Note Use a C V joint amp a long slip spline style shaft assembly to avoid problems with lifted vehicles If you wish to have a custom driveshaft fabricated you will need to get your new driveshaft measurement length Use the measurement procedures listed in step 18 Note for proper C V type drive shaft operations the rear differential yoke should be pointing at the transfer case output yoke This should be checked under normal driving conditions and load Pg 6 STEP 19 Speedometer Calibration Data Proper calibration of the speedometer will greatly depend on what changes have been made to the axle gear ratio and tire size There are some combinations that will not require calibration changes refer to the chart below and are shown in the color gray The other data reflects what your speedometer percentage of error will be if the speedometer 15 not recalibrated If your vehi
9. lation of this kit requires you to nearly disassemble the entire case If you need to rebuild or feel like you have additional worn parts now would be the time to do so 2 Obtain a service manual for your Jeep This will provide illustrations and information regarding parts identification torque values and other important data 3 Use photos and notes mark and label all parts for future reference 4 Keep all bolts nuts washers ect separated into groups as you remove them Place inside zip lock bags and mark location removed from 5 Make sure you have all the required tools pre lubricants RTV sealant OEM part number 82300234 thread locker and a clean work area 6 Make sure you have the time needed to perform this conversion without being rushed STEP 1 Remove the transfer case from the Jeep Drive shafts speedometer drive unit linkages etc must be removed The case must be separated from the transmission Refer to your service manual for details STEP 2 Remove front yoke nut and yoke Note the position of the speedometer drive and then remove speedometer drive unit Shift the range lever into the 4 Low position Remove the selector lever All of these parts will be re used STEP 3 Remove the output shaft boot and dust shield Some newer models may have a harmonic balancer There may be other slight model variations Refer to your service manual for details STEP 4 Remove the spacer and snap ring Remove the seal
10. ork them into position with the main shaft and case Once they are properly located replace the mode spring onto the shift rail Pg 4 Photo 4 NP231 after completion of the first 9 steps The rear case half is now ready to be installed STEP 11 Make sure all parts are clean and ready to install Be sure the oil pump and pick up tube are properly located Use RTV sealant OEM P N 82300234 on the case halves A good seal will prevent oil leaks Slide the rear case half on and into position Do not force the case together The mode fork shift rail needs to extend through the rear case half Install all the bolts in their proper locations and torque to 20 25 ft Ibs Reinstall the selector lever STEP 12 Install speedometer drive gear snap ring in the groove on the shaft near the pump Next install the speedo drive gear and then the second snap ring STEP 13 IMPORTANT Some Cherokees use a vacuum actuator on the rear output housing that attaches to the mode fork shift rail Check your old housing for the vacuum actuator A fitting 1s provided for it on the new output housing On most Jeeps the fitting will not be used A plug with a seal has been provided On some other transfer cases the shift rail may need to be shortened Determine the steps required by shifting the transfer case while observing the mode fork shift rail Find the position where the rail protrudes the farthest out of the case Test fit the rear output housing on the rear
11. shaft OE Main Shaft 9 Remove these cage bearings if 2 equiped Early 231 Drive Sprocket Drive Chain Pg 3 STEP 8 Be sure all parts are clean and serviceable Prelube all parts before installation Place the mode hub sprocket and retaining ring into position on the new shaft NOTE you may need to remove cage bearings from the drive sprocket on early NP231J See diagram above These bearings will not be needed Discard Photo 3 Mode hub drive sprocket and retaining ring positioned on the new main shaft These parts are now ready to re install AGAIN Early model 231 s might require the removal of the needle bearing cage from the drive sprocket before it can be installed Discard needle bearing cages as they are no longer needed Mode Shift Fork Rod Should measure 9 380 long STEP 9 With the case disassembled inspect the mode fork shift rod see image above If the shift rod measures 10 2 than you will need to cut it down to a length of 9 380 This has been found to be a common problem for 1988 1989 YJ models You will need to cut the shift rod at the end located on the back side of the transfer case Yoke side Make sure that after cutting all burs and ruff edges have been cleaned STEP 10 Lubricate the shaft assembly chain and shaft bearing surfaces Install the main shaft assembly into the front case half planetary assembly Place the front output shaft on the chain and w
Download Pdf Manuals
Related Search