David*BJ70
Looking forward to reach the end of the world
I wonder want is the maximum speed for shifting in 4wd without damage the t-case ?
Top speed to shift in 4wd
- Thread starter David*BJ70
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you can't, you most be parked and in neutral gear. that's what the manual recomend
Tapage
Club 4X4 Panamá
I thought the issues is if you can " feel " the gears is the same thing as shift without syncro.. take care ( I always stop my TLC .. we have time to all things here 
)
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lowenbrau
SILVER Star
If the hubs are locked in and you want to shift to 4 high, you can do it at any speed. (The manual says up to 100 KPH I think) I'm not sure why you'd want to shift to 4WD and faster but mechanically there is no reason you couldn't.
This advise applies to any of the old, manual hub, mechanical shifter, part time 4WD Land Cruisers. All bets are off if you let a computor or vaccum do the shifting and hub enguaging.
This advise applies to any of the old, manual hub, mechanical shifter, part time 4WD Land Cruisers. All bets are off if you let a computor or vaccum do the shifting and hub enguaging.
You can do it but ...
Look at it this way.
If there is a mis-shift ... take you speed and *multiply* the damage by this factor to teh t-case.
This is why I shift when my truck is stopped. I like to multiply by "0".
To each their own,
Cahil
Look at it this way.
If there is a mis-shift ... take you speed and *multiply* the damage by this factor to teh t-case.
This is why I shift when my truck is stopped. I like to multiply by "0".
To each their own,
Cahil
lowenbrau
SILVER Star
cahilc said:
I'm on the other side of the fence. If you are on a mountian pass that varies between dry and slippery ( very commont on a spring day) I'd rather shift back and forth at speed than just leave it in 4WD over the dry sections. I have shifted back and forth dozens of times ona single trip with out slowing down or pushing in the clutch. I have also had many t-cases apart and I understand what is going on in them.
60wag
SILVER Star
Going from high to low, definitely don't shift when moving. Going from 2 to 4 to 2, shift any any speed since both the front and rear drive shafts are going the same speed. The t case merely couples them together. Although why anyone would want to put a part time 4wd vehicle in 4wd over 30mph, I don't understand but that's a whole 'nuther discussion.
It is amazing what you can do if you understand things.lowenbrau said:
I used to shift my 40 in and out of 4wd all the time up at Tahoe. And actually I still do it going to the trail.
Typically, if something is not right. It will not let you shift
Seem's like people really need to understand the question....If you are on a dirt road AND you have the locking hubs "locked" and are switching between 2 high and 4 high, you could do it at any speed
given you are traveling in a straight line. You can not under any circumstances switch from 2 high or 4 high to any low range with the vehicle traveling moere than 3-4 miles an hour.
hope that makes sense....
Dave
given you are traveling in a straight line. You can not under any circumstances switch from 2 high or 4 high to any low range with the vehicle traveling moere than 3-4 miles an hour.
hope that makes sense....
Dave
Mark W
Yep, I really don't really care that much I guess.
In the winter time I leave my hubs locked (basically from the beginning of November 'til the end April most years). Most of us do up here. I shift in and out of 4 wheel drive more times than I can remember everyday while at speed. For a 1985 vintage Cruiser (as the original poster lists in his sig) there is no speed limit. You could do it at 150mph if you can get your Cruiser moving that fast.
With manual hubs (locked) or driveplates, there is no "missing" of the shift to be concerned about and there is no damage potential. (You aren't really "shifting", rather you are just "locking".) Any other Cruiser with a manual activation of the T/C (not vacuum) and manual locking hubs (not auto) has the same "lack of issues"
As Bruce alludes to... If you understand how the T/C works you realize that there is no reason not to engage the front axle at speed.
Mark...
With manual hubs (locked) or driveplates, there is no "missing" of the shift to be concerned about and there is no damage potential. (You aren't really "shifting", rather you are just "locking".) Any other Cruiser with a manual activation of the T/C (not vacuum) and manual locking hubs (not auto) has the same "lack of issues"
As Bruce alludes to... If you understand how the T/C works you realize that there is no reason not to engage the front axle at speed.
Mark...
so whats your max speed while driving around in 4 high?
lowenbrau said:
I totally agree with this. But you should adjust the air pressure in the front/rear tires so that the front and rear drive shafts are running at the same speed. You can check this on a straight road at speed by shifting the xfer halfway into 4wd, to the point where the gears just touch each other, and feel the teeth rubbing past each other. Takes a little practice but fairly easy to do. If there is more than a tooth per second or so I like to adjust air pressure. You can tell which needs more pressure by doing the same thing while pressing hard on the gas. If the rate at which the teeth go past each other increases when you push on the gas then the rears need more air.
The proper pressure depends on how much weight and/or people you are running with, tire wear, etc.
Once adjusted you can shift in and out of 4wd any time you want by changing the throttle a bit to remove the loading on the gears. No need to stop or push in the clutch. As lowenbrau says this is very handy on roads with ice here and there.
Karl
Mark W
Yep, I really don't really care that much I guess.
60wag said:
Do a daily commute on roads that are completely covered with snow and ice for a while. Or even just unpredictably partially covered (kinda back to the origianl question). Drive the Alcan in the winter. Run a trapline on a frozen river for a couple of seasons. There's lots of reasons and lots of people who run 4 wheel drive at higher speeds on a regular basis.
Mark...
I remember this discussion coming up last winter.
My manual (or is it my dash-sticker...) says 55 mph MAX in 4wd. If you're going 70, you can be in 2wd.
As far as shifting back and forth... Lower == better, as far as I'm concerned.
My manual (or is it my dash-sticker...) says 55 mph MAX in 4wd. If you're going 70, you can be in 2wd.
As far as shifting back and forth... Lower == better, as far as I'm concerned.
Mark W
Yep, I really don't really care that much I guess.
brett76 said:
Me? depends on the conditions I am traveling in. Nothing to do with the drivetrain if that's what you mean. I've cruised the highway at 75 in 4wd pretty routinely.
Mark...
Exactly,Mark W said:
Heck stock 40's (and I assume 60's) had drive flanges.
What is the diffeence between running with the just the hubs engaged at 70 or the tcase in 4wd and the hubs engaged??? The Tcase still spins when you are not in 4wd with the hubs rolled.
David*BJ70
Looking forward to reach the end of the world
- Thread starter
- #18
Thank you all.
So no matter for 2H to 4H.
And don't worry. I understande the way for shifting 4H to 4L. Max 8km/h. It's write on the glove box
So no matter for 2H to 4H.
And don't worry. I understande the way for shifting 4H to 4L. Max 8km/h. It's write on the glove box
mace and mark w
thank you very much
thank you very much
Mark W said:In the winter time I leave my hubs locked (basically from the beginning of November 'til the end April most years). Most of us do up here. I shift in and out of 4 wheel drive more times than I can remember everyday while at speed. For a 1985 vintage Cruiser (as the original poster lists in his sig) there is no speed limit. You could do it at 150mph if you can get your Cruiser moving that fast.
With manual hubs (locked) or driveplates, there is no "missing" of the shift to be concerned about and there is no damage potential. (You aren't really "shifting", rather you are just "locking".) Any other Cruiser with a manual activation of the T/C (not vacuum) and manual locking hubs (not auto) has the same "lack of issues"
As Bruce alludes to... If you understand how the T/C works you realize that there is no reason not to engage the front axle at speed.
Mark...
Mark, Do you feel any difference when the hubs are locked and the TCase is still in 2WD (slower overall due to the additional hardware being engaged)? How about gas mileage change?
Bryan
