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Front Driveshaft Always Suppose To Spin?

Mckenzie

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Mckenzie Senior Enthusiast

Mckenzie

Posted
Posted

I was making a video of my trucks exhaust and for the hell of it i backed over the camera to get an underside shot and i noticed that my front drive shaft is clearly spinning when the truck is 2WD. Is this suppose to be?

tyhuck Senior Enthusiast

tyhuck

Posted
Posted

Im pretty sure that everything that spins in 4wd also apins in 2wd, the only difference is that its not "locked in" like it is in 4wd............I think.

greentourismo Enthusiast

greentourismo

Posted
Posted

i dunno if its the same as the 900's, but if they have the auto transfer case and it is in auto mode, it will spin all the time even tho its not locked in. If it is in 2wd mode it wont spin.

jro909 Senior Enthusiast

jro909

Posted
Posted

all the 4wd systems i've seen regardless of brands have always had it spinning even if 4x4 isen't engaged

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted
all the 4wd systems i've seen regardless of brands have always had it spinning even if 4x4 isen't engaged

 

Unless you have locking hubs. The only reason they spin now is because the wheels are attached to the axles, and that makes the front diff spin, which makes the drive shaft spin.

dewfpo Senior Enthusiast

dewfpo

Posted
Posted

Manual transfer cases don't spin the front driveshaft in 2WD. My 2007 Toyota FJ Cruiser and 1985 Ford F150 did not spin the front driveshaft in 2WD. I haven't checked my 2005 Silverado 2500HD to see if it spins in 2WD.

 

DEWFPI

Bluedog Enthusiast

Bluedog

Posted
Posted
Manual transfer cases don't spin the front driveshaft in 2WD. My 2007 Toyota FJ Cruiser and 1985 Ford F150 did not spin the front driveshaft in 2WD. I haven't checked my 2005 Silverado 2500HD to see if it spins in 2WD.

 

DEWFPI

 

The front drive shaft will turn no matter what transfer case you have unless you have locking front hubs - that are unlocked.

pm26 Senior Enthusiast

pm26

Posted
Posted

This sucks. There should be manual or automatic locking hubs on the front axle. Without them, one pays a hefty fuel economy penalty. Spinning those axles and the differential uses energy due to friction. I sort of assumed that these trucks had automatic locking front hubs.

rodram Enthusiast

rodram

Posted
Posted
This sucks. There should be manual or automatic locking hubs on the front axle. Without them, one pays a hefty fuel economy penalty. Spinning those axles and the differential uses energy due to friction. I sort of assumed that these trucks had automatic locking front hubs.

 

the automatic locking front hubs on the 80's era GM/Chev trucks had a lot of problems (primarily, they would not unlock when you thought they were ... ) .. whatever is on the new trucks is considered by GM to be better ... (I still think manual locking hubs are the best,.... but omg you actually have to stop and get out of your 4wd vehicle and manually lock them .... omg, how inconvenient!!! ... and then when you are done with 4wd you have to stop AGAIN and manually unlock them!)

dewfpo Senior Enthusiast

dewfpo

Posted
Posted
Manual transfer cases don't spin the front driveshaft in 2WD. My 2007 Toyota FJ Cruiser and 1985 Ford F150 did not spin the front driveshaft in 2WD. I haven't checked my 2005 Silverado 2500HD to see if it spins in 2WD.

 

DEWFPI

 

The front drive shaft will turn no matter what transfer case you have unless you have locking front hubs - that are unlocked.

 

 

Maybe in a GM product but that is not necessarily true of other manufacturers.

 

My 2007 Toyota FJ Cruiser with Part Time 4WD, does not spin the front driveshaft and does not have unlockable hubs. It does have an "Automatic Differential Disconnect". When I manually shift the transfer case into 4Hi or 4 Lo it mechanically engages the front driveshaft and thru an electrical actuator, connects the CV shafts to the front differential. The Part-time 4WD FJC"s get about 2 mpg better than the Full Time 4WD FJC's with a 3rd differential (Gleason-Torsen) in the Transfer Case.

 

Other manufactures may use different technologies but not all 4WD vehicles spin the front driveshaft in 2WD, even without unlockable hubs, that's a fact.

 

DEWFPO

frdfandc Enthusiast

frdfandc

Posted
Posted

My old 1988 F-150 with a manual t-case and auto locking hubs did not spin the front drive shaft.

 

The new trucks use CV axles mated to a differential. The differential is still hooked up to the front drive shaft, even though the actuators are not engaged, still causing the front drive shaft to spin some what due to friction, but not as much as when the vehicle is in 4wd.

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