4 wheel drive - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 21 (permalink) Old 10-28-2007, 07:12 PM Thread Starter
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4 wheel drive

My friend is telling me that i shouldnt have to lock the hubs to have 4 wheel drive. He thinks that i should be able to pull the 4x4 lever to put it in 4 wheel and power should go to the front wheels. but it doesnt do that.

i disagree with him. if that were true, then i shouldn't be able to spin my front driveshaft with my hand when the hubs are unlocked and the transfer case is set at 2 wheel drive. but i can.

someone shed some light for me.

2000 F250 7.3L CC Lariat 4X4 SB;

Performance:TS Performance Tuner///K&N Intake///Custom 5" Straight Pipe///6.0 Intercooler///B&M Trans Cooler///Foil Delete///Zoodad///CCV.
Interior: Autometer Gauges: Pyro, Trans, and Boost///Alpine In-Dash DVD Player///Audiobahn Sound System///Cobra 29 CB.
Exterior: Pro Comp 4" Lift///36" Super Swampers///16" wheels///Dual Hadley Peterbilt Horns///Viair 380c Compressor///Two 3 gallon air tanks///20% Tint///Warn Standard Hubs.

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post #2 of 21 (permalink) Old 10-28-2007, 07:22 PM
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he must be from dodge or chevy land where they have fulltime 4wd, meaning the front axle is always engaged and the front driveshaft is always spining, fortunatly for use we have automatic or manual locking hubs that disengage the front axle and driveshaft to save on gas and wear/tear. and we have the advantage to use lo range in 2wd

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post #3 of 21 (permalink) Old 10-28-2007, 07:26 PM Thread Starter
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Quote:
Originally Posted by Power Stroke
he must be from dodge or chevy land where they have fulltime 4wd, meaning the front axle is always engaged and the front driveshaft is always spining, fortunatly for use we have automatic or manual locking hubs that disengage the front axle and driveshaft to save on gas and wear/tear. and we have the advantage to use lo range in 2wd

f***ing A dude. Thank you, i thought i knew my vehicle. Thanks for your input.

2000 F250 7.3L CC Lariat 4X4 SB;

Performance:TS Performance Tuner///K&N Intake///Custom 5" Straight Pipe///6.0 Intercooler///B&M Trans Cooler///Foil Delete///Zoodad///CCV.
Interior: Autometer Gauges: Pyro, Trans, and Boost///Alpine In-Dash DVD Player///Audiobahn Sound System///Cobra 29 CB.
Exterior: Pro Comp 4" Lift///36" Super Swampers///16" wheels///Dual Hadley Peterbilt Horns///Viair 380c Compressor///Two 3 gallon air tanks///20% Tint///Warn Standard Hubs.

-Marshall-
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post #4 of 21 (permalink) Old 10-28-2007, 07:47 PM
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If you have a 4X4 switch in the dash it should go into 4X4 with out locking the hubs because the hubs have a vacuum line going to them that will lock them for you. the manual lock part is just there in case you have a vacuum leak, which is pretty common. now if you just have a lever in the floor I bet it doesnt have the vacuum part of it and you will have to lock them manually, but i have never been around a super duty with the lever to know for sure.

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post #5 of 21 (permalink) Old 10-28-2007, 08:04 PM Thread Starter
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mine does not have shift on the fly, so yea i must lock them manually, lever on the floor.

but my friend just doesn't see how the hubs are not "attached" to the axle when the hubs are unlocked. its really annoying cuz he thinks he knows all about every car and he can't be wrong. So he tells me something is wrong with my truck.

Even with both hubs locked, does that necessarily mean that both tires will spin at the same time, like a LSD?

2000 F250 7.3L CC Lariat 4X4 SB;

Performance:TS Performance Tuner///K&N Intake///Custom 5" Straight Pipe///6.0 Intercooler///B&M Trans Cooler///Foil Delete///Zoodad///CCV.
Interior: Autometer Gauges: Pyro, Trans, and Boost///Alpine In-Dash DVD Player///Audiobahn Sound System///Cobra 29 CB.
Exterior: Pro Comp 4" Lift///36" Super Swampers///16" wheels///Dual Hadley Peterbilt Horns///Viair 380c Compressor///Two 3 gallon air tanks///20% Tint///Warn Standard Hubs.

-Marshall-
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post #6 of 21 (permalink) Old 10-28-2007, 08:33 PM
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Quote:
Originally Posted by AllOut0606

Even with both hubs locked, does that necessarily mean that both tires will spin at the same time, like a LSD?
no because the front differential is "open" meaning the tires can spin at different speeds.

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post #7 of 21 (permalink) Old 10-28-2007, 08:35 PM
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Quote:
Even with both hubs locked, does that necessarily mean that both tires will spin at the same time, like a LSD?
The front axle on Superduties is a open differential. The only way you'll get both wheels to spin (mud, ice, steep hill, etc) is if you install lockers.
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post #8 of 21 (permalink) Old 10-28-2007, 09:04 PM Thread Starter
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Quote:
Originally Posted by Pocket
The front axle on Superduties is a open differential. The only way you'll get both wheels to spin (mud, ice, steep hill, etc) is if you install lockers.

ok, so it is an open differential. but then why is it "jumping" when i turn the wheels on asphalt? i realize that the wheels are turning faster then one another in a turn, but shouldn't the diff take care of that jumping?

2000 F250 7.3L CC Lariat 4X4 SB;

Performance:TS Performance Tuner///K&N Intake///Custom 5" Straight Pipe///6.0 Intercooler///B&M Trans Cooler///Foil Delete///Zoodad///CCV.
Interior: Autometer Gauges: Pyro, Trans, and Boost///Alpine In-Dash DVD Player///Audiobahn Sound System///Cobra 29 CB.
Exterior: Pro Comp 4" Lift///36" Super Swampers///16" wheels///Dual Hadley Peterbilt Horns///Viair 380c Compressor///Two 3 gallon air tanks///20% Tint///Warn Standard Hubs.

-Marshall-
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post #9 of 21 (permalink) Old 10-28-2007, 09:40 PM
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does the front not even have limited slip on these trucks like the rear??

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post #10 of 21 (permalink) Old 10-28-2007, 09:53 PM
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Quote:
ok, so it is an open differential. but then why is it "jumping" when i turn the wheels on asphalt? i realize that the wheels are turning faster then one another in a turn, but shouldn't the diff take care of that jumping?
That "jumping" on a sharp turn is actually the front axle u-joints binding up. Look behind the wheel hub assembly and you'll see the u-joint knuckle.

Quote:
does the front not even have limited slip on these trucks like the rear??
Nope, all open. I've tested it out many times. Found a few steep trails that my truck is spinning both rear tires as well as one of the front ones, and barely makes it up. Those are always fun. I'll need to get a video sometime of my truck doing that. It's cool to watch. Got the power, but the weight and tire grip sometimes doesn't want to cooperate.
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