are D300s shift on the fly or do you need to stop to put it in 4hi?

shift on the fly refers to twist a knob or push a button and the transfercase is engaged, im gonna say NO they are not

with my hubs locked I can pull my D300 into 4hi on the fly, works on a Scout should be the same for a heep! :flipoff2:

Originally posted by Brad
shift on the fly refers to twist a knob or push a button and the transfercase is engaged, im gonna say NO they are not

Shift on the fly refers to being able to shift into, and out of, 4 wheel drive while moving. My wrangler, with a shift LEVER, is shift-on-the-fly.

I ask because I think on my 89 I can put it in 4hi up to 35 MPH or something.

Originally posted by apeters89


Shift on the fly refers to being able to shift into, and out of, 4 wheel drive while moving. My wrangler, with a shift LEVER, is shift-on-the-fly.

see what i know :laughing: oh well Bob answered right:D

I'd say its shift on the fly, now the more important question at what speed should you not shift on the fly?
With my Dana 300 and twin stick I've gone to shifting when stoped or very slow, with my old J3000 I'd "shift on the fly" up to about 30mph...

luke

Originally posted by YJ4LIFE
are D300s shift on the fly or do you need to stop to put it in 4hi?

I wouldn't think so considering there isn't really any synchros like a 231.

I remember helping with a rebuild and seeing the inside of the 300 and it's Gear into another gear... (sort of speak) no chain, blah blah blah

I would vote NO, final answer

I imagine it would depend on what type of hubs (or lack there of) you are running. With the front hubs locked, I always thought you could shift the t-case at any resonable speed as long as your front and rear wheels were going the same speed (ie don't try and shift while you spinning a tire). The term shift-on-the-fly came about with the advent of vacumn disconnect front axles that would engage the front, and synchronize the speed during the shift. If you are using this type of front end with an old style t-case, it might not be able to handle a true "shift on the fly" Of course if your replacing the t-case you should have already gotten rid of any "shift on the fly" front axle.

chad

Originally posted by jeepclub


I wouldn't think so considering there isn't really any synchros like a 231.

I remember helping with a rebuild and seeing the inside of the 300 and it's Gear into another gear... (sort of speak) no chain, blah blah blah

I would vote NO, final answer

Ditto. No synchros, no shift on the fly... Whether the D300 has them or not, I don't know. Never taken one apart.

I can confirm it has no syncros and is NOT shift on the fly. It can go in but it is very notchy. Better to come to a slow roll to engage.

Phil
Got one in my TJ and had it apart to install the 4to1 and HD rear output.

300 is not officially shift on the fly. No syncros so the front gears will not match speed and it will grind.

However, if you lock the front hubs and are not flying it will do it because the gears are all spinning at the same speed.

I wouls dtill come to at least a very slow roll before engaging 4wd, it's better for all the parts, even in a true shift on the fly case.

Originally posted by chadl
I imagine it would depend on what type of hubs (or lack there of) you are running. With the front hubs locked, I always thought you could shift the t-case at any resonable speed as long as your front and rear wheels were going the same speed (ie don't try and shift while you spinning a tire). The term shift-on-the-fly came about with the advent of vacumn disconnect front axles that would engage the front, and synchronize the speed during the shift. If you are using this type of front end with an old style t-case, it might not be able to handle a true "shift on the fly" Of course if your replacing the t-case you should have already gotten rid of any "shift on the fly" front axle.

chad

You right on the money chad. Any transfercase can be shifted at any speed if your hubs are locked or the front end is otherwise engaged. Shift on the fly transfercases can do this up to a certain speed without the need for the hubs to be locked or the front end engaged. This capability doesn't gain you much unless you have automatic hubs or a vacumn disconnect.

i dont know about the rest of you all but shifting a dana 300 into any gear aint easy! you have to yank and pull on the levers just to get it outa 4 low. every dana 300 i have seen is like that...well or at least kina tough to move.

i would be lucky just to get the beast in gear while moving. ha i would have to say NO to the shift on the fly thing.

Chris G.

i have shifted my D300 from 2hi to 4hi at speeds of over 65mph (on the highway) with no problems. with the front hubs locked in, and assuming your tires are all the same size, all the gears in the x-case should be spinning at relative the same RPM, provided you are driving in a straight line (not going around a curve). it always shifted fine. i put some pressure on the shifter, push in the clutch, shift the x-case, and let out the clutch. no bad noises or stiff shifting. hope this helps! matt

The damn D300 in my CJ must be shift on the fly only.

I have to either roll forward or backward to get it engaged:flipoff2:

Originally posted by jeepnmatt
i have shifted my D300 from 2hi to 4hi at speeds of over 65mph (on the highway) with no problems. with the front hubs locked in, and assuming your tires are all the same size, all the gears in the x-case should be spinning at relative the same RPM, provided you are driving in a straight line (not going around a curve). it always shifted fine. i put some pressure on the shifter, push in the clutch, shift the x-case, and let out the clutch. no bad noises or stiff shifting. hope this helps! matt

Nobody's saying it can't be done. Hell almost all big trucks (semis, straight box trucks) have unsynchroed trannies. It's just a matter of having the engine and transmission (or in the case of a transfer case the front and rear driveshafts) going the same speed when you shift them. That doesn't make it "shift-on-the-fly" though--which is really just a marketing term coined when they started putting synchros in transfer cases.

Jake

D300's are not shift on the fly. You have to be almost completely stopped before shifting. I had to move slightly forward 7/or backwards to get mine engaged. When I had the auto in front of it, I had to shut the eng off before i could get it in or out of 4 low.
As for shifting it into 4 hi & 2 hi at speds, that's not that difficult for any t-case. With the same gears front & rear, and the tires the same size, the 'case gears are all spinning the same speed.

i had to do the same thing with my dana 300 w/ an auto infront of it. or shift between f on r and push it in or out when the gears were stoped for a split second....*grind...grind* BANG well she's in 4wd! hehehe


Chris G.

im glad to hear that im not the only one with a bitchy D300. after wheeling for a while it takes an act of congress to get it shifted out of 4 low. when i shift out of 2hi and go into any gear it is usually easier if i am rolling slowly.....

Originally posted by JeepinIan
D300's are not shift on the fly. You have to be almost completely stopped before shifting. I had to move slightly forward 7/or backwards to get mine engaged. When I had the auto in front of it, I had to shut the eng off before i could get it in or out of 4 low.
As for shifting it into 4 hi & 2 hi at speds, that's not that difficult for any t-case. With the same gears front & rear, and the tires the same size, the 'case gears are all spinning the same speed.

Uh hello, yes they are, shift on the fly refers to 4 hi not 4 low :rolleyes: If yours doesn't shift at speed maybe a rebuild is in order. :nuke: Who ever says the D300 is not shift on the fly should have to go back to training school meaning JU :flipoff2: :beer:

Originally posted by CJBoxer


Uh hello, yes they are, shift on the fly refers to 4 hi not 4 low :rolleyes: If yours doesn't shift at speed maybe a rebuild is in order. :nuke: Who ever says the D300 is not shift on the fly should have to go back to training school meaning JU :flipoff2: :beer:

Maybe you should try returning to JU. The D300 is NOT a shift on the fly case. a shift on the fly case will have a syncro in it. Most also have a switch in them to engage/disengage the front if it has a disco on it.

ANY case can go 2hi to 4hi while in motion as long as the front is moving at the same speed as the rear. If your D300 is so shift on the fly go out on dry pavement, lock the hubs, start doin' big circles and try to put it in 4-hi. Or maybe shift into 4-hi with out the hubs locked.

Originally posted by DUG


Maybe you should try returning to JU. The D300 is NOT a shift on the fly case. a shift on the fly case will have a syncro in it. Most also have a switch in them to engage/disengage the front if it has a disco on it.

Nah don't think so :flipoff2: Shift on the Fly was coined long before those fancy buttons and rotary knobs you see on Fords and other luxo vehicles. It has mainly to do with autolocking hubs and not because of some syncro in the T-case, like you say most T-cases can be shifted at speed but it doesn't do you much good if your hubs are not locked in. So in snowy conditions you run your hubs locked and when you come to a patch of snow or icy roadway you SHIFT ON THE FLY :idea: Take it from me or not here is a quote from Carlist.com

Older-style part-time Four-Wheel drive systems sometimes required drivers to stop and lock the front hubs before engaging four-wheel drive. Most SUVs now have automatic locking front hubs and the ability to shift "on-the-fly" (at speed) from two-wheel drive to four-wheel drive. However, many limit the speed at which this can be done (usually less than 50 mph and sometimes as low as 15 mph), and many still require the driver to stop and back up to fully disengage Four-Wheel drive.

Or maybe you will understand a womans perspective better :laughing: :girly: from Womanmotorist.com :bounce:

The ability of a four-wheel-drive vehicle to be shifted between two- and four-wheel drive while the vehicle is in motion.

:rolleyes:

CJBoxer

Uh...not tryin to be an ASS, but this is fawkin beatin the shit outa a simple point. The meaning of Shift on the fly doesn't matter. The point is that You CAN shift your D300 while moving, if you feel like it. The speed at which you do this is your own choice.