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I have recently fitted a lockup switch (2nd-5th) for my petrol auto. Why did I fit one. My previous 4wd had the ability to lock the transmission and my biggest disappointment with the Prado due to its high gearing was the constant locking and unlocking of the torque converter particularly when towing but even without towing on undulating roads. During my discussions with other Prado owners most indicate this is a possible issue however many just say its an auto I just drive it and let it do its own thing. I have noticed the majority of those I have spoken with do not know the difference between when an auto changes gears and when the torque converter locks and unlocks. I acknowledge it is difficult to tell the difference. I fitted one despite the expense of $400 for not much more than switch because driving with the torque converter unlocked can cause a lot more wear and overheating of the box. Also I suspect there must be a fuel advantage if used correctly. The unit consisted of 3 relays a switch and resistor plus wiring loom and took me 2 hours to fit without any major issues. 2 wires need to be cut and soldered on the ECU.
What is the result so far after about 1000kms and about half towing 2.5 tonne with a GCM of 5.2 tonne. With the switch on, the vehicle changes gears when required but the torque converter remains locked. Downshifts appear to occur later or at lower speeds (revs). When towing on undulating roads it is nice to have it remain locked but this requires more accelerator going up hills. My experience is that autos climb better with the trans unlocked. eg unlocked in 5th will climb better than locked in 4th. I haven't noticed any improvement in fuel consumption but I need to do more testing. I get 5kpl towing the above rig at 90 kph and 8-9kpl at 100kph on the road with an empty vehicle and around 7kpl around town. Is the switch worth it. Too early to say, but for me initial impressions are I like it. It does what I expected and is great cruising without towing. If you are a serious offroader then having it available on 1st and Rev would be very useful in steep conditions. Hope this is a help to someone.
What is the result so far after about 1000kms and about half towing 2.5 tonne with a GCM of 5.2 tonne. With the switch on, the vehicle changes gears when required but the torque converter remains locked. Downshifts appear to occur later or at lower speeds (revs). When towing on undulating roads it is nice to have it remain locked but this requires more accelerator going up hills. My experience is that autos climb better with the trans unlocked. eg unlocked in 5th will climb better than locked in 4th. I haven't noticed any improvement in fuel consumption but I need to do more testing. I get 5kpl towing the above rig at 90 kph and 8-9kpl at 100kph on the road with an empty vehicle and around 7kpl around town. Is the switch worth it. Too early to say, but for me initial impressions are I like it. It does what I expected and is great cruising without towing. If you are a serious offroader then having it available on 1st and Rev would be very useful in steep conditions. Hope this is a help to someone.
Matty80
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