X5 Towing- Problem with Reverse

[blue dragon]

Originally Posted by ingenieur

This ZF box will not handle uphill tow in reverse - you are lucky it was not damaged.

Elaborate, where are you getting this info?

[bawareca]

Originally Posted by blue dragon

Elaborate, where are you getting this info?

+1.

[KenFox]

More info from my digging... Talked to a ZF-certified transmission shop owner, and he thought I was describing a properly operating transmission. He's never heard of any issues with reverse like I was describing on the ZF8HP. Since the RPMs were staying low, that is an indicator that the transmission wasn't slipping.

I also removed "X5" from my google searches on backing uphill with trailers, and it is not an uncommon problem with vehicles that do not have a 4wd-low gear range.

Now trying to figure out how to fit that circular driveway in our front yard.

[ingenieur]

On this 8HP45 car - in reverse if the load is high as determined by the DME - engine torque is reduced (engine rpms reduced as you experienced) to protect the transmission...had to look up my notes about this complaint from another car.