LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

Shifting from Park to Drive

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Old 06-07-06, 12:25 AM
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ls400boi
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Default Shifting from Park to Drive

My 1990 LS400 has been in my family since early 1990. The problem I am experiencing is very hard engagement when shifting from Park into Drive. Oddly, shifting into Revers is very normal. The car doesn't show any high RPM's, yet it still engages with a "leap". I'm afraid to drive it this way for a long period of time because I don't want to tear up the differential or anything... much less the tranny itself. Does anyone have a clue as to what the problem is? I haven't taken it to a dealership because they have ridiculous prices for everything. Thanks.
Old 06-07-06, 02:36 AM
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GRAND_LS 4
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So did this problem occure out of nowhere, gradually, or your're not sure?
Old 06-07-06, 04:11 AM
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ls400boi
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It began doing this like 3 months ago. Also, I should add that the silky smooth shifting which used to be undetectable is now noticeable. Also, I don't think it's the transmission that is the problem. The problem seems to be related to the differential in some way.

Last edited by ls400boi; 06-07-06 at 04:16 AM.
Old 06-07-06, 11:29 PM
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RA40
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There is a whole list of things listed in the UCF2X service manual for harsh engagement form N-D:

on vehicle repair

Accumulator control valve
Solenoid modulator valve
accumulator
orfice control valve


Off vehicle repair
forward clutch
Old 06-08-06, 02:22 AM
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ls400boi
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Thanks for that information. I will begin checking those things out as soon as I get some time. Right now the car is parked in the garage, so I'm not driving it. I have an economy car that I drive around town. I will keep the club updated. ;-)
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