2H to 4H shifting

[Gohon]

According to the owners manual with 4x4 trucks we are suppose to be able to shift from 2H to 4H while the vehicle is moving. I have only attempted this twice, both times at 25 to 30 mph. Both attempts resulted in a clashing or grinding noise from the transfer case. Not a pretty sound to my ears. If I come to a stop there is no problem. Both times I attempted the shifts I let up from the throttle for a few seconds and shifted fast and with a lot of force, but still the noise. Now the second time I tried this it did go into 4H after a second or two but that grinding scares the hell out of me. Of course I can always come to a stop but when you swing around a corner and your faced with snow, slush and ice for a couple hundred yards it’s nice not to have to stop first. Am I doing something wrong or is my transfer system out or sync? Not sure if I’m in the right forum on this one.

Jerry

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1999, 2500 QC 4X4, Driftwood,Auto, Stock, Cab High Shell, Tow Package, Camper Package.

 

[CCCRAM]

I had the same problem, until I looked in the owner's manual and discovered I had to shift the auto into neutral before shifting the transfer case. Makes sense and it worked very smoothley after that.

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Y2K, QC, 2500, 4x4, LB, White, Auto, 4. 10, SLT+, Camper-Tow-Snowplow pkgs. , 4wABS, HD transfer case, trans cooler. For Fun: Better-built SS nerf bars, Lear bed topper. 8,000 miles (9/22/00).

 

[zman]

I've been having the same problem recently. I have always shifted to neutral before shifting into 4H when not moving, but in my 97 gasser, I was always able to shift into 4H while on the move without the gears clashing and without shifting to neutral.

It is has been pretty cold here in the last few days - less than 10 degrees. I wonder if that has anything to do with it.

Steve

 

[jeepit]

I am suppose to be shift on the fly with my truck and Jeep but never do I always stop, put it in neutral and shift.

 

[K_Arts]

This is kinda interesting to hear. . cause my truck doesn't have that problem at all. I have actually shifted from 2H to 4H many times going in between 30 and 40 mph.


My truck is equipped with the Standard Transfer case.

Kev

[This message has been edited by K_Arts (edited 12-18-2000). ]

 

[Mike Vonada]

Mine shifts real easy in and out when on the fly. Have not had the problems you guys have had.

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2001 4X4 ETH 6 spd, QC, SLT,SB, 3:54, Flame Red,camel tan leather, 4" exhaust turbo back, EGT,boost guages, Line-X bedliner.

-------------------------
Project that got way out of hand: total "BOMB"
95 Wrangler 4. 0L, NV4500, Reverse cut Dana 60 rear 44 front, Altas II, Quarter Eliptic suspension in rear, coils up front, Warn 10,000 lb to turn me right side up and the list goes on!

 

[Chad Sheets]

Who has the standard transfer case that comes in the gassers, and who has the heavy duty transfer case option?? That might be the difference. There are two transfer cases for our trucks. I have the heavy duty one, but never tried to shift "on the fly". I always pull down into 4H from park before I leave if I think I will need it.

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Always ready to help!
2000 2500 Red Sport quad cab, 4x4, K&N, DDI's, straight piped, boost, pyro and fuel pressure gages, Hot Power Edge, mean looking set of 33. 5" tires, Snap On diamond tool box, Marine Corps window sticker, Semper Fi!

1972 340 Cuda'. Original tripple Black, 340 car w/air. Good clean car, super stock springs, Weld Prostars, shaker hood, strong 340 with a 727/4000 stahl, 4. 56... . Bombs away!
NRA Life Member. http://www.geocities.com/chadsheets

 

[Steve St.Laurent]

I haven't had any problems with my shift on the fly working. I do have the LD transfer case but it's not the same one as in the gassers. The gassers use an NV231, the V-10 and diesel have either the NV241LD or NV241HD. I wish I had the HD case for durability but I bought the truck used and that was the only thing it didn't have - I'll just put an HD on when and if I break the one I have. I've shifted it into and out of 4wd up to 50 mph or so, the owners manual says below 60mph I believe. Up here when the snow is drifting there are large areas that are bone dry and then large areas drifted over - stopping to shift in and out of 4wd each time would be a PIA.


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-Steve St. Laurent - President of the Great Lakes TDR
'98 QC LB (CMNSPWR), 4x4, ISB, 5sp, 4. 10 LSD, TST Powermax, 275hp RV injectors, SW fuel pressure gauge, BD exhaust brake, Isspro turbo temp monitor, front Draw-Tite receiver, rear Draw-Tite class V receiver, BFG 285/75R16 AT KO's, (all the common stuff clipped)

 

[Sean Flanagan]

Doesn't sound right to me but I dont have an auto transmission.

Mine shifts 2H-2H fine. I routinely shift it at 70 mph! No grinding. It engages (the little 4WD light comes on) faster if I push in clutch when I shift it.

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98. 5 2500 QC LB 4x4 5spd, white. BFG 285x75x16
Cummins 24v w/ TST PowerMAX w/EGT and Boost gauges on A-Pillar. VanAaken CPC. K&N In the factory air box. Stock Injectors, Stock Exhaust (Geno's Muffler Eliminator). Re-routed breather stink tube, 2WD-low kit, SnugTop, JJ Stainless Running boards, Tow Hooks, Bushwacker Street Flares, and a Cup Smoothie.
78,000 miles (11/17/00)

 

[willyslover]

my old rig [98. 5] went many times on the fly it was a 3500 which had the hd transfer and 5sp never a gear grind... have not had the snow depth to warrent the on the fly use on the new 3500 6sp

 

[Phil Stuart]

Yeah,whats the deal? I have a hard time also when trying to shift from 2H to4H with the clutch pedal depressed and going say 30-40 MPH. Makes a real nice grinding noise like some others on this post. I have the HD 241 transfer case if this makes any difference. I read that I SHOULD be able to shift on the fly but it's not happenin' #ad
. !.
Any more clues people or is it just the nature of the beast?

Phil S

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`01 2500,4x4,QC,LB,ETC,DDX,DHG
3. 55 LSD,Tow Pkg. ,Snow plow pkg. ,Forest Green PC,Mopar alum. side steps,Mopar mud flaps with Cummins logo,Mist grey seat covers,Tekonsha brake controller,Hadley air horns,Pacbrake.
Built in St. Louis
THE BIG GREEN MACHINE

Phil Stuart

 

[Archive]

<font color=blue>Sean I think your only supposed to do it upto 55mph lol.

I have the HD transfercase and it shifts fine, ocasionally its a lil difficult to throw so I let up on the throttle and it usually goes into 4h. I shift in and out of 4wd on a regular basis, usually highways are plowed but the side streets are not. I like it. One reason I got the HD transfercase (snow plow prep) was it specifically stated "Shift on the Fly".

I do it anywhere from 10mph to 55mph.

 

[wdixon]

I have the HD transfer case as well and I have not had any of the problems you are stating. I have shifted as has as 40 MPH once but mostly it is at fairly low speeds, Less than 30 MPH, when I do it. Always pops right in place. Now getting it to go out of 4 low is the problem for me. I always seem to have to attempt it 2 or 3 times before it goes back to 2 high.

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Y2K 2500, Auto, 4x4, QC, Short Box, Garnet Red, Westin Nerf Bars, K&N. Synthetic Lubes, Reese 15k Side-to-Side Piviot Hitch

1998 Sea Breeze 37 Ft Triple Slide 5th Wheel.

 

[Mr. C]

I have the 241HD transfer case and regularly pull it into 4 high at 60 to 65 MPH with no noise,however when new I experienced the above problem. It turned out that I was not pulling it into gear with enough force. Pulling harder just doesn't seem like the right thing to do but there is some sort of sinchronising mechanism in there that brings the guts up to speed. The transfer case will actually engage before the slider in the front axle connects the power to the ground.

I would recomend first checking the fluid level in your transfer case then try pulling in to gear with a firm continous motion,the lever should make a solid "clunk" when it hits home. If you release engaging pressure before the guts are up to speed you get the grind when you continue pulling the lever into the 4WH position.

If this deosn't work you may have a problem for the dealer to adress. The tranfer case is designed to "shift-on-the-fly" to speeds up to 50 MPH or so, per the owners manual.

My humble oppinion.

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99,QC,3500,Sport Black,4x4,Auto,3. 54,Anti-spin,Camper pkg,Carpet delete,all options except leather.
Silencer ring?? We don't need no stinking silencer ring!!!
Self installed goodies,
OEM Running boards,Mud flaps&Bed liner, Tinted windows,Jacobs E-Brake,BD Torque Loc. Whimpy stock class 4?? hitch fell off-replaced it with a Super Hitch(1200# tongue,15000# trailer) on the house from DC thanks for the recall!!

 

[blackbeast]

A couple of tips that might help... ...

Tip number 1.
Don't let up on the throttle or depress the clutch. Keep solid pressure on the driveline.

Tip number 2.
Shift quickly and firmly. Don't hesitate when you shift or half shift.

Tip number 3.
It is imperative that all wheels are moving at the same speed. i. e. no tight corners or wheel spinning.

I've never had a problem, and have seen more problems by shifting into neutral on the fly because it aloows parts of the drivline to loose energy, which means they are moving at a different rate than the rest of the driveline. The only time I ever stopped was going from 4 low to 4 hi. When in an auto I usually put it in park.

My father in law always shifts into neutral on the fly and he just grenaded the front diff on a 2k Nissan. I don't know if there is any connection, but I have never had any trouble shifing on the fly. We were coming back from the woods (bambi hunting). He shifted his auto to neutral, shifted out of 4X and put the truck back into drive at about 30 mph. We got up to about 50 and then BOOM! and the truck lunged forward. Then it broke loose. Dealer said that the front diff was trashed.

Another note.
Don't shift from 4 low to neutral on the transfer case. while the transmission is in gear. If you do, shut the engine off and put the truck into drive. (autos only)

 

[DHatfield]

I have a HD241 transfer case and I usaually shift in and out of 2H to 4H and back at speeds between 10-55 MPH with not problems. I just press in on the clutch, move transfer case lever quick and firmly, let out clutch and go. It has never clashed or had problems, except for when it was new and I shifted with-out using the clutch then I would get the aweful gear grind.

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2001 2500HD Quad Cab SLT SB 4x4, HO Cummins, 6-speed, 3. 55 gears, LSD, brightwhite/driftwood, 4w ABS, camper and trailer tow packages, HD transfer case, snow plow prep, group, cab lights, Isspro Boost and Pyrometer gauges mounted on A-pillar, 4" JRE exhaust, BD exhaust brake. 22500 miles as of 11/11/00.

1980 CJ-5, Modified for off-road use, bobbed fenders, 350 TBI, NP435 trans, 4. 56 gears, Dana 300, Dana 44 front, Dana 60 reverse-cut rear axle, ARB air lockers front and rear, 15/35/15 Super Swamper TSL on 10X15 steel rims, Cobra CB, Warn 9000I winch, nerf bars, 1/4" steel rock crawler bumper front and rear, jerri can/spare tire rack, custom roll cage.

 

[SteveAZ]

Ditto on Diesel Dougs post. Had the same problem. I wasn't shifting positivly and firmly, thus causing the "grind". Now it's no problem.

You should be moving at least 2 to 3 MPH minimum to shift.

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99' Qcab, 4x4, auto, chrome nerf bars, VA, Boost elbow, DiProcal Pillar mount gauges,

 

[HC]

Those with the clash - do you replace 4 tires at a time, or buy in sets of 2 according to tire wear? Different tires, including even different brand or amount of wear on same brand, means different diameter. This could cause some mild clashing...

(p. s. - NV241HD, no clash)

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2001 ETH, QC, LWB, 4WD, 3. 54, SPA Pyro & Boost, K&N RE-880 w/foam pre-cleaner, ARE Z-series Cab-high shell, Rear ARB locker, and all kinds of synthetic fluids...

 

[Gohon]

Took the truck around the block a few times today to experiment with Diesel Doug’s tips. First couple times I shifted I thought, okay he was right, keep steady throttle while shifting. However this did not always hold true. What I discovered was that on a flat stretch of road and holding steady throttle in the 20 plus mph the transfer case shifted smoothly to 4H. If there was any kind of incline or decline this was not the case. Shifting does seem to be normal when the transmission is in 3rd lockup but not in 1st or 2nd gear. This is leading me to think us guys with the automatics may simple have to live with this problem because of the built in slippage of the torque converter while in first and second gears which simply won’t allow a good sync of the gears. The owners manual does not address the type of transmission you may have, just how to shift. I have the 241 transfer case but it is not the 241HD so there may be a difference here also. Any thoughts on this.

NOTE: After reading some of the other posts a little closer I realized some of you who are not having this problem also have a automatic transmission so I guess the above theory is out. Guess it is time for a visit to the dealership. Trick now is to find a good dealership in the Tulsa Oklahoma area as I just recently moved into the area.

Jerry

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1999, 2500 QC 4X4, Driftwood,Auto, Stock, Cab High Shell, Tow Package, Camper Package.

[This message has been edited by Gohon (edited 12-18-2000). ]

 

[Fireman Dave]

Both transfer cases are supposed to be shift on the fly. I had a heck of a time trying to get someone to define the difference between the two when I ordered. The dealer didn't really know, and it took me a few calls to the Dodge 800 number to find an answer. They finally told me the difference was that the HD had a pto. I've since learned on this site that it's also built heavier.
Mine (not the HD) works fine so far, but I haven't used it a lot yet. Also, the owner's manual says to shift into 4 low while going 2-3 mph. I tried it, and it works. It's a reach when you're moving, though.

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2001 2500; SLT; 4x4; QC; LWB; Auto; 3. 54 LS; 265s; Camper; Tow; Sliding Rear Window; Travel Convenience Group; Cab Clearance Lamps; Forest Green