Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSACURA20043.5RLREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSAUTOMATIC TRANSMISSION OVERHAUL - M5DAADJUSTMENTSDRIVE PINION HEIGHT
2004 Acura 3.5RL
Drive Pinion Height
2004 Acura 3.5RLSECTION Drive Pinion Height
NOTE:
If drive pinion and ring gear are replaced, drive pinion height must be set. Drive pinion height may also need to be set if incorrect gear tooth contact pattern exists.
- Drive pinion height is controlled by thickness of drive pinion thrust shim located between pinion bearing and drive pinion shaft. When installing used drive pinion and ring gear and gear tooth contact pattern is incorrect, see GEAR TOOTH CONTACT PATTERNS article in GENERAL INFORMATION to determine if thrust shim should be thicker or thinner.
- When installing NEW drive pinion and ring gear, calculate drive pinion thrust shim thickness by noting etched mark located on side of drive pinion. See Fig 1.
- Etched mark is a positive (+) or negative (-) mark along with a numerical digit indicating drive pinion size. Etched mark is positive or negative in thousandths of a millimeter.
- If etched mark on old drive pinion is positive (+), add it to old drive pinion thrust shim thickness. If etched mark on old drive pinion is negative (-), subtract it from old drive pinion thrust shim thickness.
- If etched mark on NEW drive pinion is positive (+), subtract it from drive pinion thrust shim thickness obtained in step 4. If etched mark on NEW drive pinion is negative (-), add it to drive pinion thrust shim thickness obtained in step 4.
- For example: if old drive pinion thrust shim thickness is 2.00 mm and old drive pinion etched mark is +20 (.02 mm) and NEW drive pinion etched mark is -10 (.01 mm), replacement drive pinion thrust shim thickness should be 2.03 mm.
- Select drive pinion thrust shim that is closest to but not more than determined drive pinion thrust shim thickness. Drive pinion thrust shims are available in thicknesses of .064-.089" (1.64-2.27 mm) in .001" (.03 mm) increments. Part numbers are 41410-P5D-000 to 41431-P5D-000 in numerical sequence.
NOTE:
Etched mark is indicated in thousandths of a millimeter. If etched mark is -20, this is a negative .02 mm.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.