1997 Dodge Truck Cold Start Cavitation?

  • 1 POST
  • 1997 DODGE TRUCK

Transmission problem
1997 Dodge Truck V8 Two Wheel Drive Automatic 124000 miles

I have a '97 Dodge Ram P/U w/124,000 mi. For about 5 minutes after I start it, (only when it's cold out) the transmission sounds like an old Ford Power Stering Pump, like it's cavitatiing. It only does this in Park and Reverse, Neutral and Forward gears are OK.
When its warm out all positions are OK.
I'm wandering if this is slowly damaging the Trans?
It was totally rebuilt at 97,000, never low on fluid, and has always done this before and after rebuild. Is this typical Mopar or an unusual Problem?
Thanks, Dave

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Thursday, March 12th, 2009 AT 12:40 PM

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Here's the bulliten on it:
46RE TRANS BUZZ IN REVERSE - REVERSE BUZZ KIT TECHNICAL SERVICE BULLETIN Reference Number(s): 21-11-97 REV. A, Date of Issue: September 5, 1997 Superceded Bulletin(s): 21-11-97, Date of Issue: August 15, 1997 Related Ref Number(s): 21-11-97 REV. A ARTICLE BEGINNING REVERSE BUZZ (46RE) Model(s): 1996-97 Dodge (AB) Ram Van, Wagon; 1996 Dodge (AN) Dakota; 1996-97 Dodge (BR) Ram Truck Group: Transmission Bulletin No.: 21-11-97 Rev. A Date: September 5, 1997 SYMPTOM/CONDITION Buzz sound when shifting into reverse. This condition may be more noticeable on a cold vehicle that has been parked outside overnight. DIAGNOSIS Starting with a cold vehicle (parked outside overnight), start the engine and shift the transmission from park to reverse and from drive to reverse several times while listening for a buzz sound when in reverse. The buzz may be more noticeable with the windows down or from outside the cab. If the buzz occurs when in reverse, perform the Repair Procedure. PARTS INFORMATION
NOTE: This bulletin supersedes Technical Service Bulletin 21-11-97 with an effective date of August 15, 1997 which should be removed from your files. All revisions include changes to the reverse band adjustment procedure.


REPAIR PROCEDURE This bulletin involves removing the overdrive unit, propeller shafts, and (transfer case if applicable) and replacing the rear band adjusting lever, reaction lever and strut with high ratio components along with replacement of the regulator valve pressure plug and sleeve. PROCEDURE PROPELLER SHAFT AND TRANSFER CASE (IF EQUIPPED) 1. Shift the transmission into park and the transfer case into neutral. 2. Record all radio presets and disconnect the negative battery cable. 3. Raise and support the vehicle on a hoist. 4. Remove the transfer case skid plate if so equipped. 5. Mark the front and rear propeller shafts and U-joints for alignment reference and remove the shafts. 6. Disconnect the wires at the vehicle speed sensor. 7. Disconnect the vent hose and vacuum harness at the transfer case switch, if equipped. 8. Disconnect shift rod from grommet in transfer case shift lever, or from floor shift arm whichever provides easier access. 9. Support transmission with a jack stand. 10. Remove the rear cross member. 11. Support the transfer case with a suitable jack (secure the transfer case to the jack with safety chains). 12. Remove nuts attaching transfer case to the transmission. 13. Move transfer case rearward until it is free of the transmission output shaft. 14. Lower the jack and move the transfer case from under the vehicle. PAN/FILTER/VALVE BODY REMOVAL 1. Remove the gear shift and throttle levers form shaft of valve body manual lever. 2. Disconnect wires at solenoid case connector. 3. Position a drain pan beneath the transmission oil pan. 4. Loosen the oil pan bolts to allow the transmission to drain into the drain pan. 5. While supporting the oil pan, remove all bolts and lower the oil pan away from the transmission. Drain the remaining fluid into the drain pan. 6. Remove the fluid filter from the valve body. 7. Remove the valve body to transmission case bolts. 8. Lower valve body enough to remove accumulator piston and springs. 9. Work manual lever shaft and electrical connector out of transmission case. 10. Lower valve body, rotate valve body away from case, pull park rod out of sprag, and removevalve body. OVERDRIVE REMOVAL 1. Remove the bolts attaching the overdrive unit to the transmission. 2. Carefully slide the overdrive unit off the intermediate shaft. DO NOT tilt unit during removal. Keep the unit as level as possible. 3. Insert alignment tool 6227-2 into the splines of planetary gear and overrunning clutch to prevent the splines from rotating out of alignment. 4. Remove and retain the overdrive piston thrust bearing and spacer. REVERSE BAND LEVERS AND STRUT REPLACEMENT 1. Loosen the locknut and unscrew the reverse band adjusting screw but DO NOT remove the screw). 2. Using a small punch and hammer, tap the reverse band reaction pin out from the front until it can be removed. Remove the shaft so both levers can be removed. See Fig. 1 . Discard the removed levers and strut. 3. Inspect the shaft "O" rings and replace them if necessary P/N 06030910. 4. Compress the rear servo piston enough to permit snap ring removal. 5. Remove the servo piston snap ring. Use caution when removing to prevent servo bore scratching. 6. Remove the rear servo retainer, spring, and piston assembly. See Fig. 2 . 7. Measure the distance from the end of the rear servo piston plug to the face of the piston. See Fig. 3 . Record this measurement for future use when adjusting the rear band. 8. Reinstall the rear servo retainer, spring, and piston into the transmission. Secure it with the snap ring. 9. Install the band adjusting screw (from old lever) and partially install the (new) band adjusting lever by pushing the reaction shaft through one flange of the lever P/N 04897877M. 10. Using PETROLEUM JELLY, assemble the replacement strut and reaction lever P/N 04897877AA. NOTE: The overdrive unit must be fully supported during removal. This is necessary to prevent damaging the intermediate shaft. DO NOT allow the shaft to support the entire weight of the overdrive unit. NOTE: Use care when separating the overdrive unit from the transmission to prevent gasket damage. NOTE: If misalignment occurs, the overdrive unit will have to be disassembled in order to re-align the splines. NOTE: The bearing may remain on the piston or in the clutch hub during removal.11. Install the assembled strut and reaction lever inside the adjusting lever and push the reaction pin completely through the assembly until it is flush with the back of the transmission case. OVERDRIVE INSTALLATION 1. Inspect the gasket to make sure it was not damaged during removal. If damaged, refer to the service manual for replacement. 2. Install the thrust bearing and spacer in overdrive unit sliding hub. Use petroleum jelly to hold it in place. 3. Carefully slide the alignment tool 6227-2 out of the unit. 4. Raise the overdrive unit and carefully slide it straight onto the intermediate shaft. 5. Install the attaching bolts and tighten the bolts to 34 N.m 25 ft-lb) in a diagonal pattern. 6. Install the transmission mount and tighten to 41 N.m (30 ft-lb). 7. Connect speed sensors and speedometer wires. REVERSE BAND ADJUSTMENT 1. Remove the plug in the rear servo test port. 2. Based on the measurement taken in step 7 of REVERSE BAND LEVERS AND STRUT REPLACEMENT select the appropriate size drill bit from the following table: DRILL BIT INFORMATION 3. Insert the butt end of the appropriate drill bit into the test port 3 inches deep and centered beneath the servo plug. 4. With the bit properly located, tighten the reverse band adjusting screw to 8 N.m (72 in-lb) and back off the screw 2 1/4 turns. 5. Loosen the adjusting screw and repeat step 4. While holding the adjusting screw, tighten the adjusting screw lock nut to 34 N.m 25 ft-lb). 6. Remove the drill bit and replace the rear servo test port plug. PRESSURE PLUG AND SLEEVE REPLACEMENT 1. Without disassembling the valve body, remove the regulator valve cover hiding the pressure plug and sleeve. See Fig. 4 . NOTE: Make sure the strut is installed correctly into the low reverse band. To check installation, apply the adjusting lever by hand and note the movement of the band. If it is not installed correctly, loosen the adjusting screw until the strut can be put in place without disassembling the levers. NOTE: DO NOT tighten the adjusting screw at this point. Year/Vehicle Measurement Drill Bit Diameter Early 96 vehicles .115 - .135 .272 - letter I drill Late 96/97 vehicles .150 - .170 .312 - 5/16" drill2. Remove the existing pressure plug and sleeve and discard the old parts. Install the replacement parts from the kit. 3. Reinstall the regulator valve cover and tighten the screws. REINSTALLATION OF REMAINING COMPONENTS 1. Place valve body manual lever in low (1 position) so ball on rod will be easier to install in sprag. 2. Position valve body in case and work end of park lock rod into and through pawl sprag. Move rod to check engagement. 3. Install accumulator piston and springs. The inner spring has a smaller diameter. 4. Swing valve body over piston and outer spring to hold it in place. Align accumulator piston and outer spring, manual lever shaft and electrical connector in case. 5. Seat valve body in case and install the bolts. Alternately tighten each bolt to 11 N.m (100 in- lb). 6. Install the fluid filter. Replace as necessary P/N 03515996. 7. Install throttle and gearshift levers on valve body manual shaft. 8. Check and adjust front band if necessary. 9. Connect solenoid case connector wires. 10. Install the oil pan with a new gasket P/N 02464324. Tighten the pan bolts to 17 N.m (13 ft-lb). 11. If applicable, mount the transfer case on a jack and secure with chains. 12. Align transfer case and transmission shaft and install transfer case on transmission. Tighten the transfer case bolts to 35 N.m 26 ft-lb). 13. Connect the vent hose. 14. Connect indicator switch harness to transfer case, if necessary. Secure wire harness to clips on transfer case. 15. Align and connect propeller shafts. Tighten attaching bolts to 19 N.m (170 in-lb). 16. Lower vehicle. 17. Fill transmission with Mopar ATF +2, type 7176 fluid P/N 04798233. 18. Reconnect the negative battery cable and set radio presets recorded in step 2 of the first procedure 19. Adjust the gearshift linkage and throttle valve cable if necessary. Fig. 1: Rear Band Adjusting Lever/Pin, Reaction Lever & Band Link Fig. 2: Rear Servo Retainer, Spring & Piston Fig. 3: Measurement Of Rear Servo Piston Plug To Piston Fig. 4: Valve Body Components WARRANTY INFORMATION POLICY: Reimbursable within the provisions of the warranty.Labor Operation No: 21-15-05-96 Time Allowance: 2.7 hrs. Optional Equipment: 21-15-05-60 4x4 Equipped BR - 1.7 hrs. 4x4 Equipped AN - 1.5 hrs. Failure Code: P8 - New Part

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Thursday, March 12th, 2009 AT 12:50 PM

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