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"thunk" Sound On Out Of P On Incline/decline


Bali26
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Hi,

My 91 LS400 makes a Thunk sound when i take it out of park when its on incline or a decline. Not on perfectly level ground.

Its like the drivetrain is under stress and removing from P unloaded it. The sound kinda comes from rear of car.

If I use parking brake then, there is no thunk. The mechanism that locks up drivetrain in P seems to be holding the weight of the car on incline. Is it supposed to be like that?

Is there a bushing that needs changing?

Bali

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Its like the drivetrain is under stress and removing from P unloaded it. The sound kinda comes from rear of car.

If I use parking brake then, there is no thunk. The mechanism that locks up drivetrain in P seems to be holding the weight of the car on incline. Is it supposed to be like that?

Is there a bushing that needs changing?

Bali

What you describe is normal. No bushing replacement needed, at least not for this. I always use the pk brk on inclines of any kind except in really cold weather. Keeps the brake in shape and takes the stress off the tranny.

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After three years of parking mine on a step driveway, I highly recommend you start using your e-brake to hold the car in place instead of the transmission. It's much cheaper and easier to replace e-brake shoes, than adjusting your transmission gates that gave out due to too much stress of holding a 4k+ car. When you park, put the car in N then set the e-brake, then put it in P. You'll feel the rear of the car squat down a little, which is normal. If the e-brake slips, then the tranny will hold the car. But a few more years of that god awful clunk/slam out of park will certainly create problems.

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