Also, whether tis’ nobler to use the “sport” vs normal setting on the shocks. I can’t tell a difference.
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Yes, it does change the shifting patterns. Engine revs higher before shifting and the torque converter does not lock up until a much higher speed. The torque converter also seems to slip more.
It's sort of a false power thing. I never use it anymore and don't recommend it. Stick in the normal mode and you'll get better economy and run more like a diesel should.
It'll lock-up in 3rd gear at 70km/h, if you leave it in the normal mode. I think the power mode lock-up is more like 90km/h. Being in lock up means the torque converter is not slipping, and this means less heat into the radiator. Being in lock-up also means more power to the wheels. The torque converter in these transmissions is dyno proven to loose 10kW (13hp) in heat!! The surge of power you feel when it locks up is that 13hp coming back.
The OD switch is however VERY useful. It does not impact the lock-up speed, but is great for hills, passing etc. The OD switch shifts between 3rd/4th, and still allows lock-up in both.
If you need more power for taking off from a stop (like if you're towing for example), put the shifter into 2nd, and the vehicle will take off in 1st gear, you'll get a nice hard shift with solid power from 1st to 2nd. Then manually shift into D when the rpms get up there. If you have your OD switch off, it'll shift into 3rd, again you can ride the rpms up, then hit the OD switch and it'll put you in 4th.
So basically, just using the shifter between 2nd/D and using the OD button On/Off, you can have full control of your transmission, with low torque converter slip, and quick torque converter lock-up. This shift also allows you to use engine braking on hills. Even when I tow my camper trailer the engine compression is enough to hold it all back on an 8% grade with minimum application of brakes.
Is mine busted, or is this a "feature" that later disappeared for good reason?
Wow. Thanks for the explanation GTS I can see the O/D button really helping me out now I know how it works in practice!
I've just finished dialing in the first iteration of the FMIC on my LJ71, its running strong and cool thanks to your super informative posts. Now I'm making more power the transmission is behaving better but is still really annoying, I never saw myself ever buying an automatic vehicle and a 5 speed swap isn't in the cards especially considering I have a spare transmission with 50k. So I've resigned myself to embracing the auto!
gonna be that guy and revive this, but i need to know Im understanding this rightYes, it does change the shifting patterns. Engine revs higher before shifting and the torque converter does not lock up until a much higher speed. The torque converter also seems to slip more.
It's sort of a false power thing. I never use it anymore and don't recommend it. Stick in the normal mode and you'll get better economy and run more like a diesel should.
It'll lock-up in 3rd gear at 70km/h, if you leave it in the normal mode. I think the power mode lock-up is more like 90km/h. Being in lock up means the torque converter is not slipping, and this means less heat into the radiator. Being in lock-up also means more power to the wheels. The torque converter in these transmissions is dyno proven to loose 10kW (13hp) in heat!! The surge of power you feel when it locks up is that 13hp coming back.
The OD switch is however VERY useful. It does not impact the lock-up speed, but is great for hills, passing etc. The OD switch shifts between 3rd/4th, and still allows lock-up in both.
If you need more power for taking off from a stop (like if you're towing for example), put the shifter into 2nd, and the vehicle will take off in 1st gear, you'll get a nice hard shift with solid power from 1st to 2nd. Then manually shift into D when the rpms get up there. If you have your OD switch off, it'll shift into 3rd, again you can ride the rpms up, then hit the OD switch and it'll put you in 4th.
So basically, just using the shifter between 2nd/D and using the OD button On/Off, you can have full control of your transmission, with low torque converter slip, and quick torque converter lock-up. This shift also allows you to use engine braking on hills. Even when I tow my camper trailer the engine compression is enough to hold it all back on an 8% grade with minimum application of brakes.
A343F is great transmission. Having been in my friends HDJ81 with A442 many times, I must say I like my A343F much better.