Auto transmission jumping out of gear over bumps

Joined
Jun 21, 2018
Messages
5
Location
Victoria
Hi Guys,
My auto transmission (hydraulic A440) starting jumping in and out of 1st and 2nd gears in low range whilst bouncing over bumps heading uphill on steep tracks on the weekend. i..e the indicator light on the dash was blinking and I could feel momentary loss of drive (on-off-on-off-on). This has never happened before and we do a fair bit of decent 4wding.

I suspect that this may be occurring due to excessive movement of the auto transmission relative to the body causing the shifter to toggle in and out. I checked the shift lever linkage adjustment - all good. Thinking may be the transmission mount is moving around too much although it looks good. The engine mounts were recently replaced with genuine.

Has anyone experienced this issue before?
Cheers
 
Joined
Feb 7, 2015
Messages
863
Location
Eastern Washington
Mine did that once but it sounds like you've already eliminated the cause, which was mis adjusted linkage. The shift lever physically moved in my case, you could see it jump from drive to neutral.
 

alia176

SILVER Star
Joined
Aug 21, 2003
Messages
14,135
Location
Tijeras, NM
Since our vehicles are getting quite old, this would be a good time to replace the two motor mounts and the transfer case crossmember mount, all at the same time. At least this will eliminate any movements of the drivetrain.
 
Joined
Jun 21, 2018
Messages
5
Location
Victoria
Since our vehicles are getting quite old, this would be a good time to replace the two motor mounts and the transfer case crossmember mount, all at the same time. At least this will eliminate any movements of the drivetrain.
You're probably right - the engine mounts are almost new but it wouldnt hurt replacing to eliminate any chance of movement.. Cheers
 
Joined
Jun 21, 2018
Messages
5
Location
Victoria
Are you sure it wasn't the drive flanges slipping at high torque moments?

I assume you had the CDL on?
CDL defintely engaged. Fairly sure it wasnt the drive flanges as I could feel loss at the rear wheels, and have aisin hubs on the front. The indicator light on the dash was blinking which coincided with the temp power loss. Definitely worth checking the hubs.
 

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