Thread: Correct auto towing procedure

I think as long as you can maintain lockup there is little to be gained by changing down. By definition that is on relatively light throttle above 80Kmh.

AFAIK most heat is generated in an auto when the Torque converter is slipping and that is under about 2200RPM in an older V8 or 2800 RPM in a TD5.
I always try to keep above those revs if off road and that just about always means low ratio in sand.
I have never had a transmission light on even on sand on a hot day towing my camper trailer.
Regards Philip A

I'll back phillipA, its near enough..

I'll also add put it in sports when you need to move off or drive it hard up a hill and kick down out of drive when you know your going to have to climb.

are the discovery torque converters electronic lock up? could a circuit be made to lock them manually?

d2 yes, d1 no,

yes there are kits that let you override it...

IMHO, leave it alone, its pretty clever for what it is and if you're smart enough to know when you want the torque converter clutch to be locked up then your probably smart enough to be able to drive a manual instead of steering something thats making your driving choices for you.

Depends on what you're towing. With light trailers I use D and S mode to stop it from holding gears. With a heavy trailer I use 3 and S except on the open road to minimise labouring and unlocked time which happens between 3rd and 4th locked.

Originally Posted by R Miller

are the discovery torque converters electronic lock up? could a circuit be made to lock them manually?

The 4speed discovery is a ZF4hp22/24 , We have available a compushift that will control all shift characteristics for the Full Electronic version (ie No TV Cable ).
I am unsure of the year that this changes so you would need to check.
Cost would be around $1700.00 plus fitting

We also have available a lock-up switch for the electronic units that can control lock-up apply in all gears.
Wholesale Automatic Transmissions
Cost $ 325 . 00 plus $25 .00 freight

Gavin,, will this control un-locking?
as in "1st gear less than 40KPH" un-locking?

Shack, is it a rattler or V8?

Hi Pedro. From reading all the documentation from Wholesale Automatics, I think so, but until I can sort out some wiring issues in my RRC with 1999 D2 TD5 auto ECU (on another thread) and connect the unit up, I can't be 100% sure, especially as I don't know if there actually is a lockup for 1st and 2nd. Plus I have the heavier duty 4HP24. Will post when resolved, but might be a few weeks. Cheers Gavin