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Front drive axle


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Pretty vague question.....in any live tandem axle setup the torque generated is always transmitted to wheel end with the least amount of traction. If that is enough traction to overcome the load then the truck moves. If not the wheel spins. If you engage the power divider then you force the torque into both axles, hopefully by doing this you can put down enough torque to get moving. With that being said the front drive doesn't necessarily transmit torque/power to the ground unless the power divider is engaged. Do you have a power divider? Is it engaged? On vendor axles like Meritor/Eatons it will be a manual air switch. A lot of the Mack tandems have an automatic "peanut" power divider that uses clutches.

Please provide more information.

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Are there any drive setups that use a "straight-thru" drive shaft (no inter-axle differential)?  If so, then ANYTHING wrong in the front drive would cause it to do nothing, but still let the rear axle drive.  Like, broken spider gears, side gears, ring/pinion.

If there IS an "open" inter-axle differential in there, then a broken front drive should just allow the front driveshaft to spin and do nothing. In that case (with everything intact), if you jack up ANY wheel and put it in gear, that wheel would spin all day without the truck moving.  That same setup, with an optional inter-axle differential lock, would give you the option of locking the IAD and forcing the rear axle to drive as well as the front.

With some type of torque-biasing power divider (like what I suspect 67RModel is talking about), I suppose a broken front drive could still allow the rear drive to move somewhat, because of the effects of the "automatic" power divider.

Still, more information as to exactly what setup is in there would help the guys on here narrow it down for you.  What kind of truck is this even in?  Pictures always help, too!

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"Eagles may soar, but weasels don't get sucked into jet engines."

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Can you jack up a wheel on the front axle, leave the rear axle on the ground, put it in neutral, and see what happens as you turn the driveshaft by hand?

Edited by doubleclutchinweasel
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"Eagles may soar, but weasels don't get sucked into jet engines."

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air operated power divider. did you take the line off to see if air is coming through??  did you flip dash switch to send air through???  yes on both questions   ; possible set screw backed off on slide fork. 

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clean around the small side cover plate  (4bolts) remove cover . activate the switch== fork should slide . might have to jack up one wheel AFTER you block tires ;;spin the drive shaft.  the rear rear drives the truck . auto divider ( has the wedges inside) takes hold when the rear rear spins . have seen the cog slider in the auto dividers split ;; 1 -you don't have an auto divider;;;2- noise would definately be heard. 

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take a clean pail ; pull gear oil sample from front rear. 

1 hour ago, raybing said:

The rear set drives and both axles shafts are repaired. But only rear set moves truck

both axle shafts ?? both from rear rear or all 4 from  both rear ends. no big pieces in banjo i would check the front rear axles. as earlier stated jack up one side at a time on front = spin the wheels. have seen axles break clean like machine shop did it. broken axle shows up, you know the "broom handle technic' for axle removal ? saves dropping the broken pieces in housing hopefully eliminating pulling chuck.

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