JDM-BR9-LEGACYGT

Hiya, if you head over to the Aussie forums (being migrated at the moment so give it a few days) http://forum.liberty.asn.au/index.php?sid=2b72fc63c64cd1624739ea7e232ed2e0

They are up again - use this link: http://forum.liberty.asn.au/viewtopic.php?f=73&t=35044

There are a couple of people with similar issues as we have the Auto GT here, dropping out of gear and back in. The suspicion was that one of the valve body solenoids was acting up but no result yet and can't see bc forum is temporarily out.

I and others with auto GTs have had the occasional soft thump/push like someone had rear-ended you softly, often at low speeds in slow moving traffic when you are lightly on/off the throttle, we think due to catching the auto between downchanges and the extra throttle grabs the gear too quick.

The auto and valve body is the same between 3.6 and GT and it's nothing like the previous 5 speed. The only difference is the TC, it's more slippy in the GT, high torque.

Sounds like a good start with a flush and check of the basics, also a reset to forget whatever it has learned may help.

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Thanks for the info, I will reach out to the guys at XRT and hear what they have to say also.

 

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The 5eat has been known to be a bit slow reacting to gear changes and throttle input, especially abrupt input like you are describing. I seem to remember someone either on this forum or the Tribeca forum having a similar issue.

 

I personally would shoot a pm over to XRT tuning and see what they say, or take it in to the dealer and see if there is an updated ROM for the transmission.

 

For the DIYr there are only a few things you can do, check front diff play, change trans fluid, check rear diff play. Maybe if you download freessm there is transmission relearn you can do yourself which may temporarily "fix" the issue.

Thanks for the info, I will reach out to the guys at XRT and hear what they have to say also.

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You've got the 5-speed auto in there, correct? Does this only happen when you really stomp on the gas, or does it happen under light throttle input as well? Sounds like a clutch isn't engaging correctly in the transmission. I'm not sure how the 5EAT is set up, but it almost sounds like either an overrunning clutch that's not reliably re-engaging when you get back on the power, or maybe a sticky solenoid valve that's delaying engagement of a clutch pack. Hopefully one of the 3.6R guys knows more about these transmissions than I do- USDM 5th-gen LGTs are manual trans only, and the 3.6R has the 5EAT that went into the LGT elsewhere.

What your saying about the clutch not engaging at times seems to Make sense, I will be doing some further checks into that.

Thanks for your input

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I have a 2011 JDM Legacy GT Wagon. Sometimes after applying the brake to slow down then back to stepping on the gas pedal the engine revs as if the car is in neutral for about a second then gets back into gear.

This is when it slams/jerks as if the car was hit from behind. The first time it happened I thought someone rear ended me.

I am assuming it may be the rear diff or something transmission wise.

Anyone ever experienced or having this issue. Or a diagnosis as to what is causing this?

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