Flexplate

Remove and replace the flexplate on a 2005 Dodge Viper with 8.3L V10 engine, requiring transmission removal to access the flexplate mounted between the crankshaft and torque converter.

Warnings

Tools required

Parts

• Flexplate × 1 — Use OEM specification
• Transmission pan gasket × 1 — Use OEM specification
• Transmission filter (if applicable) × 1 — Use OEM specification

Fluids

• ATF+4 automatic transmission fluid — 12 qt

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect negative battery cable to prevent electrical shorts
3. Allow exhaust system to cool completely if vehicle has been recently operated
4. Raise vehicle securely on jack stands at all four corners to provide clearance for transmission removal
5. Remove rear wheels to access rear suspension and exhaust components
6. Place transmission jack under transmission for support during removal

Procedure

1. 1

   Drain transmission fluid
   The 2005 Viper's T56 manual transmission uses gear oil, not a serviceable pan/filter. If the transmission must be drained for removal, locate the fill and drain plugs on the case and drain the manual transmission fluid into a suitable pan. Inspect the drained fluid for metal particles indicating internal damage.
2. 2

   Remove exhaust system components
   Disconnect exhaust system at collector flanges behind the catalytic converters. Support exhaust with jack stands or wire and remove the complete exhaust system from catalytic converters rearward to provide clearance for transmission removal. Remove heat shields if they obstruct access to transmission bellhousing or crossmember.
3. 3

   Disconnect driveshaft
   Mark driveshaft position relative to differential flange for proper reinstallation balance. Remove the 4 driveshaft-to-differential flange bolts. Support driveshaft and slide forward out of differential. Cap or cover differential output to prevent fluid loss. Secure driveshaft out of work area.
   ⚠Driveshaft must be reinstalled in original orientation to maintain balance. Mark clearly before removal.
4. 4

   Disconnect transmission cooler lines and wiring
   Disconnect the hydraulic clutch line at the slave cylinder or bellhousing. Disconnect the vehicle speed sensor and backup lamp/reverse lockout connectors on the T56. Cap the hydraulic line to prevent fluid loss and secure wiring away from the transmission removal path.
   ⚠Use flare nut wrench on cooler line fittings to prevent rounding of soft aluminum threads.
5. 5

   Remove transmission crossmember and shifter linkage
   Support transmission securely with transmission jack. Disconnect shift linkage at transmission lever. Remove crossmember mounting bolts at frame rails. There are typically 4 bolts securing the crossmember. Remove transmission mount-to-crossmember bolts, then remove crossmember from vehicle. Lower transmission slightly on jack to improve access to bellhousing.
6. 6

   Access torque converter bolts
   Remove the clutch inspection/dust cover from the bellhousing area. With the transmission removed, mark the pressure plate position relative to the flywheel, then loosen the pressure plate bolts evenly in a criss-cross pattern to relieve spring tension before removing the pressure plate and clutch disc.
7. 7

   Remove torque converter bolts
   After transmission removal, remove the six clutch pressure plate bolts in a criss-cross pattern, loosening evenly. Support the pressure plate and clutch disc, then remove the pressure plate and disc from the flywheel. Inspect the clutch components for wear.
   ⚠Ensure torque converter remains fully seated in transmission during removal to prevent pump damage.
   Torque spec

   Torque Converter Bolts50 Nm (37 lb-ft)
8. 8

   Remove transmission bellhousing bolts
   Locate all transmission-to-engine bellhousing bolts around the perimeter of the T56 manual transmission bellhousing. Remove all bellhousing bolts (verify exact count and positions against the factory service manual) while supporting transmission weight with a transmission jack. Note different bolt lengths and positions for correct reinstallation.
   Torque spec

   Transmission-to-Engine Bolts55 Nm (41 lb-ft)
9. 9

   Remove transmission
   With bellhousing bolts removed and transmission supported on jack, carefully pull transmission straight back away from engine to disengage the input shaft from the clutch disc splines and to clear the alignment dowels. Maintain transmission level during withdrawal. Lower transmission on jack and remove from under vehicle.ling.
   ⚠️Keep transmission level and secure on jack during removal. Transmission weighing approximately 200 pounds dropping can cause severe injury.
10. 10

    Remove flexplate from crankshaft
    Install a flywheel holding tool to lock crankshaft rotation. Remove the flywheel-to-crankshaft bolts using a socket and breaker bar (verify exact bolt count against the factory service manual). Keep bolts organized as they may be different lengths at different positions. Remove flywheel from crankshaft flange. Inspect crankshaft flange and dowel/pilot for damage or wear.
    ⚠Crankshaft must be locked to prevent rotation when removing flexplate bolts. Do not use starter motor bumping method.
    Torque spec

    Flexplate Bolts85 Nm (63 lb-ft)
11. 11

    Inspect and clean mounting surfaces
    Thoroughly inspect crankshaft flange for cracks, wear, or damage. Check flexplate bolt holes in crankshaft for thread damage or elongation. Clean crankshaft flange and alignment dowel pins with wire brush and solvent. Remove all old threadlocker residue from bolt holes. Inspect torque converter pilot hub in crankshaft for wear or scoring. Verify crankshaft endplay is within specification if flexplate failure was caused by excessive endplay.
    ℹ️Flexplate failure is often caused by misalignment, excessive crankshaft endplay, or loose torque converter bolts. Address root cause before installing new flexplate.
12. 12

    Install new flexplate
    Position new flywheel on crankshaft flange, aligning with the crankshaft dowel/index. Apply threadlocker per the factory specification to the flywheel bolt threads. Install all flywheel bolts finger-tight (verify count against factory manual). Lock crankshaft rotation with holding tool. Torque flywheel bolts to the factory-specified value in a criss-cross pattern, making multiple passes.ern, making multiple passes to reach final torque evenly.
    ⚠Follow proper torque sequence for flexplate bolts in multiple passes to prevent warping. Verify sequence with service manual as specified.
    Torque spec

    Flexplate Bolts85 Nm (63 lb-ft)
13. 13

    Prepare transmission for installation
    Install the new clutch disc and pressure plate onto the flywheel using a clutch alignment tool to center the disc. Torque the pressure plate bolts in a criss-cross pattern to the factory specification. Inspect and, if necessary, replace the pilot bearing. Apply a light coat of high-temperature grease to the input shaft splines.revent converter from sliding forward during installation.
    ⚠Torque converter must be fully seated in pump before transmission installation or pump damage will occur during bellhousing bolt tightening.
14. 14

    Install transmission to engine
    Raise transmission on transmission jack to engine height. Align transmission with engine, ensuring the input shaft aligns with the clutch disc splines and pilot bearing. Slide transmission forward, ensuring alignment dowels engage bellhousing holes. It should slide forward smoothly until the bellhousing contacts the block. If resistance is felt, do not force; verify disc alignment and dowel engagement. Install all bellhousing bolts finger-tight (verify count against factory manual), then torque to specification in a star pattern. dowels are properly engaged. Install all 6 bellhousing bolts finger-tight, then torque to specification in a star pattern.
    ⚠️Never use bellhousing bolts to draw transmission to engine. Transmission must slide forward freely until bellhousing contacts block. Forcing will damage transmission pump.
    Torque spec

    Transmission-to-Engine Bolts55 Nm (41 lb-ft)
15. 15

    Install torque converter bolts
    This step does not apply to the manual-transmission 2005 Viper. Clutch and pressure plate installation is performed before transmission installation (see clutch installation step). Omit torque converter bolt installation.tions and verify smooth rotation with no binding.
    ⚠Verify torque converter bolt sequence with service manual as specified. Uneven torque can cause flexplate failure.
    Torque spec

    Torque Converter Bolts50 Nm (37 lb-ft)
16. 16

    Install torque converter cover and crossmember
    Install the clutch inspection/dust cover to the bellhousing and torque cover bolts to specification. Raise transmission with jack and position crossmember under transmission mount. Install crossmember-to-frame bolts and torque to specification. Install transmission mount-to-crossmember bolts and torque to specification. Reinstall the direct-mount shifter assembly and reconnect the clutch hydraulic line if it was disconnected.
17. 17

    Reconnect transmission cooler lines and wiring
    Remove caps from transmission cooler lines. Connect cooler lines to transmission fittings using flare nut wrench and torque to proper specification to avoid leaks. Reconnect all transmission wiring harness connectors including speed sensor, range sensor, and solenoid pack. Verify positive engagement of all connectors and proper routing of wiring harnesses away from exhaust and moving components. Note: Disconnect the clutch hydraulic slave cylinder line (or slave cylinder) as required. Disconnect the vehicle speed sensor, backup lamp switch, and reverse lockout solenoid connectors on the T56. Secure wiring away from the transmission removal path.
18. 18

    Install driveshaft
    Align driveshaft with marks made during removal to maintain original balance orientation. Slide driveshaft into differential output shaft, ensuring full engagement of splines. Align driveshaft flange with differential flange and install 4 flange bolts. Torque driveshaft flange bolts to specification in a criss-cross pattern.
19. 19

    Install exhaust system
    Position exhaust system and align with collector flanges. Install exhaust flange bolts and torque to specification. Install heat shields removed during disassembly. Verify exhaust system has proper clearance from driveshaft, transmission, and chassis components throughout full suspension travel.
20. 20

    Fill transmission with fluid
    Reinstall the transmission drain plug. Fill the T56 manual transmission through the fill plug with the factory-specified manual transmission fluid to the bottom of the fill hole (approximately 3-4 quarts; verify capacity and fluid type against the factory service manual). Reinstall the fill plug and torque to specification.tick with engine running at operating temperature. Total capacity is approximately 12 quarts.
    ⚠Check transmission fluid level with engine running and at operating temperature. Overfilling can cause fluid aeration and shift problems.

Reassembly

1. Install rear wheels and torque lug nuts to specification
2. Reconnect negative battery cable
3. Lower vehicle from jack stands
4. Perform final fluid level check with engine at operating temperature and vehicle on level surface

Verification

• Start engine and verify no unusual noises from flexplate or transmission area
• Check for transmission fluid leaks at pan, cooler lines, and bellhousing
• Road test vehicle through all gear ranges verifying smooth shifts and proper operation
• Verify no vibration or noise during acceleration indicating flexplate balance issues
• Recheck transmission fluid level after road test and top off as needed
• Inspect for any exhaust leaks at collector flanges
• Verify driveshaft does not contact exhaust or chassis during suspension travel

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