# 2004 Lexus GX 470 transmission slams **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** transmissions, lexus\ **Created:** [June 25, 2018, 8:11pm UTC](https://community.cartalk.com/t/2004-lexus-gx-470-transmission-slams/119815 "2018-06-25T20:11:05Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![MelanieNevill](https://avatars.discourse-cdn.com/v4/letter/m/6de8d8/32.png) [@MelanieNevill](https://community.cartalk.com/u/MelanieNevill)\ **Post date:** [June 25, 2018, 8:11pm UTC](https://community.cartalk.com/t/2004-lexus-gx-470-transmission-slams/119815/1 "2018-06-25T20:11:05Z")
my transmission slams when idling while in drive ---
**Author:** ![VDCdriver](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/vdcdriver/32/48514_2.png) [@VDCdriver](https://community.cartalk.com/u/VDCdriver)\ **Post date:** [June 25, 2018, 9:32pm UTC](https://community.cartalk.com/t/2004-lexus-gx-470-transmission-slams/119815/2 "2018-06-25T21:32:54Z")
I’m not quite sure what the transmission “slamming” might mean, but the first thing that I would have my mechanic check would be the transmission mounts, as well as the motor mounts. ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [June 25, 2018, 10:12pm UTC](https://community.cartalk.com/t/2004-lexus-gx-470-transmission-slams/119815/3 "2018-06-25T22:12:01Z")
Is the Check Engine light on? Tester ---
**Author:** ![MelanieNevill](https://avatars.discourse-cdn.com/v4/letter/m/6de8d8/32.png) [@MelanieNevill](https://community.cartalk.com/u/MelanieNevill)\ **Post date:** [June 27, 2018, 7:01pm UTC](https://community.cartalk.com/t/2004-lexus-gx-470-transmission-slams/119815/4 "2018-06-27T19:01:01Z")
Yes, check engine light is on ---
**Author:** ![shadowfax](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/shadowfax/32/13026_2.png) [@shadowfax](https://community.cartalk.com/u/shadowfax)\ **Post date:** [June 27, 2018, 7:34pm UTC](https://community.cartalk.com/t/2004-lexus-gx-470-transmission-slams/119815/5 "2018-06-27T19:34:47Z")
And the transmission fluid… ---
**Author:** ![Tester](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/tester/32/15976_2.png) [@Tester](https://community.cartalk.com/u/Tester)\ **Post date:** [June 27, 2018, 9:29pm UTC](https://community.cartalk.com/t/2004-lexus-gx-470-transmission-slams/119815/6 "2018-06-27T21:29:13Z")
You need to get the codes read to see if any are related to the transmission. From what you describe, it sounds like the transmission is neutralizing and then going back into gear. Tester ---
**Author:** ![MelanieNevill](https://avatars.discourse-cdn.com/v4/letter/m/6de8d8/32.png) [@MelanieNevill](https://community.cartalk.com/u/MelanieNevill)\ **Post date:** [June 30, 2018, 1:59am UTC](https://community.cartalk.com/t/2004-lexus-gx-470-transmission-slams/119815/7 "2018-06-30T01:59:12Z")
The 2004 is the only closed transmission, you can’t check the fluid level. I did get it flushed and refilled about 5 years ago. It’s suppose to not need filling for 100,000. ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [July 1, 2018, 1:44am UTC](https://community.cartalk.com/t/2004-lexus-gx-470-transmission-slams/119815/8 "2018-07-01T01:44:40Z")
> [@MelanieNevill](#): > > you can’t check the fluid level. While it probably isn’t a simple thing to do on your driveway, a shop can check it for you. Shouldn’t cost much, if all they do is check the tranny’s fill level. After reading out all the diagnostic codes, that’s where I’d start w/this problem. ---
**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\ **Post date:** [July 1, 2018, 7:17am UTC](https://community.cartalk.com/t/2004-lexus-gx-470-transmission-slams/119815/9 "2018-07-01T07:17:11Z")
Failing engine or transmission mounts would be unusual on this vehicle. What is the frequency of the “slamming”? Once a second, once every 5 seconds? The fault codes may show that the transmission has failed.