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Old 06-28-2011, 10:35 PM   #1 (permalink)
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Unhappy Shifting into reverse transmission noise

I have a 2001 Suburu OB 6 cyl. w/ 121K. When I shift into reverse from a cold start the transmission makes a lout thunk sound. It sounds like the rear en is going to drop out. When I drive it around and park for for an hour or so, it does not make the noise when shifting into reverse. Just when it has sat all day or over night.

Any suggestions
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Old 06-29-2011, 01:21 AM   #2 (permalink)
ETC
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Check the trans fluid

Check the center carrier bearing and mount for play, U-joints, input at rear diff.

If you skip over Reverse quickly, does it clunk going in to drive ?

If you drive it a short distance, shut it off, restart it and shift to Reverse ... does it still do it ?

Are you parked on an incline ? are you using the parking brake ? . I ask because someone else had a similar issue and after a lot of guessing we figured out that they parked on an incline and never used the parking brake, this puts huge strain on the pawl in the trans and it makes a "thwang" when pull it out of park.
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Old 06-29-2011, 11:57 AM   #3 (permalink)
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My old '99 Outback did that. It was the exhaust banging on something due to torque shifting the motor/trans when going in to reverse. Likely due to worn out motor mounts, but we sold the car before fixing it. It didn't do it when hot, I guess the exhaust expanded enough that it no longer hit anything. Or maybe due to higher idle speed when cold.

It's a simple thing to check - watch under the car while someone shifts it from P to R. See what (if anything) moves.
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