I was wondering if you guys drive with you overdrive button on or off. Trying to figure out what would be best for the tranny, engine and overall driveling.
Drive with OD on or off?
- Thread starter carlosfj80
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I agree with CreeperSleeper.
I leave mine on unless I'm about to climb a steep pass on the freeway, or my tranny is hunting for a gear. I can usually hold my speed up the passes with the OD off. Another great time to turn the OD off is coming down a steep pass, as you can lay off of your brakes in order to heating up your rotors, or even worse, warping them (ask me how I know). I have better control with the OD off coming down the pass, and then I can drop down into D2 from there to slow down further if necessary, all the while staying off the brakes, yet remaining in control.
I leave mine on unless I'm about to climb a steep pass on the freeway, or my tranny is hunting for a gear. I can usually hold my speed up the passes with the OD off. Another great time to turn the OD off is coming down a steep pass, as you can lay off of your brakes in order to heating up your rotors, or even worse, warping them (ask me how I know). I have better control with the OD off coming down the pass, and then I can drop down into D2 from there to slow down further if necessary, all the while staying off the brakes, yet remaining in control.
OD on unless you are trying to DD an 80 with 35" tyres and stock 4.10:1 gearing. Then you can try pushing all the buttons and you still won't be happy until you get lower gears.
-B-
-B-
I agree with most info as far as climbing passes with O/D off except if I have cruise control on. I've found that with CC on, the tranny generally stays happy with O/D left on. Some long grades are an exception and then I "help" the CC by turning O/D off until summit has been reached. All bets are off if you're towing, though. Then it's time for ECT and O/D off, unless it will stay in O/D on the flat at like 65 mph. The trick is to keep your tranny temp as low as possible. "Gear hunting" will cause your tranny to overheat if left unattended.
fj80toyman
...One Landcruiser at a time
One thing to remember is that with the O/D OFF, torque converter lockup in 3rd gear is allowed. If you simply downshift from 4th to 3rd with O/D ON, you're just in 3rd gear and the TC won't lock up.
What I do, is if I'm in 4th gear and deep throttle, say enough to unlock the TC, I decrease the throttle and turn O/D off and let the TC lockup in 3rd gear. You can see the RPM increase and then drop as it goes from 4th --> 3rd --> 3rd L/U.
The difference between 4th with TC unlocked and 3rd gear with TC locked is about 200 RPM (higher). That way the transmission runs much (much) cooler as the TC isn't creating heat as it does when it's multiplying torque.
Dan.
What I do, is if I'm in 4th gear and deep throttle, say enough to unlock the TC, I decrease the throttle and turn O/D off and let the TC lockup in 3rd gear. You can see the RPM increase and then drop as it goes from 4th --> 3rd --> 3rd L/U.
The difference between 4th with TC unlocked and 3rd gear with TC locked is about 200 RPM (higher). That way the transmission runs much (much) cooler as the TC isn't creating heat as it does when it's multiplying torque.
Dan.
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words to live by if you regularly climb mountain passes.
I always turn my OD off when climbing. Running 10+ miles uphill under WOT or near will make some heat if the torque converter is unlocked in 3rd. Well lets say there will be less heat with it locked up in 3rd.
