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4WD qusetion. because i dont know.

Ranger850

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Not that I'll ever own or drive a true 4x4 truck, I was wondering about the front end gears. I noticed rear end gears are always specified, (i.e. 3:7.3 & 4:1.0) but what about the front wheel drive gears on a 4WD. Are they the same ratio as the rears? essentially rear ends with steering capabilities. If that's the case, could you put a front end of a 4wd on the rears and someway have 4 wheel steering. Just a rambling thought in my head.:icon_confused:
 


JamesH

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You have about 80% right. Front and rear are geared the same. (baring custom purpose builds where the front might be slightly higher ratio). The front gear set is Revere cut usually, because it will pull not push, some axles can have the same center houses, and different tubes/ends, so you could put regular cut gears in it and make it a rear steer.

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A now inactive member here, Gwaii, did exactly that with an Explorer. It involved taking two of them and putting the front portion of one frame on the rear of the other.

Basically the skills needed are far more than the average person is likely to ever achieve.
 

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G M had some rear/all wheel steer trucks a few years ago.

there are lots of specialized all wheel steering vehicles in agriculture and industry and the monster trucks.

another point to ponder, for lane changing you want all 4 wheels to turn the same way.
for going around a corner the fronts will turn opposite of the rears.

that brings up an engineering challenge, how do you change lanes while turning a corner? :icon_confused:
 

Ranger850

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I remember a Honda prelude in the 90's had four wheel steering " for quicker lane changes". My buddy had one, it was a fast car but rws was barely noticeable. I think it was just a few degrees, not like full steering. The one in the GMC's didn't last very long either. That lane changing around a corner question is for an engineer to figure out. I guess you would have to pick, cornering or lane changes. lol
 

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IIRC the big selling point on the GMs were backing up trailers.

Not sure how in the many years before, and after that quadrasteer BS, anyone has managed to back up a trailer.

Or in dodges case, SEE the trailer.

To answer the OP, yes, front and rear axles need to be geared the same, unless the axles spend most of their time spinning (as in mud), youll tear shit up in a hurry if you run different ratios on anything remotly hard packed.

Also, running different size tires on the front and rear of a 4x4 is a bad idea, unless the gears have been swapped to compensate.
 

Ranger850

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IIRC the big selling point on the GMs were backing up trailers.

Not sure how in the many years before, and after that quadrasteer BS, anyone has managed to back up a trailer.

Or in dodges case, SEE the trailer.

To answer the OP, yes, front and rear axles need to be geared the same, unless the axles spend most of their time spinning (as in mud), youll tear shit up in a hurry if you run different ratios on anything remotly hard packed.

Also, running different size tires on the front and rear of a 4x4 is a bad idea, unless the gears have been swapped to compensate.
Ford 1up'ed GM with the "little backup button" that supposedly does all the work for you. Hasa anyone ever seen one of these in action. I'm curious as to how much better it is than sticking your head out the window and looking backwards.
 

rusty ol ranger

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Ford 1up'ed GM with the "little backup button" that supposedly does all the work for you. Hasa anyone ever seen one of these in action. I'm curious as to how much better it is than sticking your head out the window and looking backwards.

Id like to see that thing wedge my 32ft travel trailer in my 12ft wide driveway off a 2 lane in town street...
 

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Front differential is offset to one side to clear the engine, and it is OPEN on most 4x4s not Limited Slip, yes you can change that but why start off with it, lol.

Ford does have 8.8" Independent rear suspension(IRS), using CV joints which gets you a bit of turning ability, weld on brackets to hold differential
2002 and up Explorer/Mountaineer's had them, if from a 4x4 then it should be limited slip

Adding the stock upper and lower A-frames(reversed sides) to the rear shouldn't be too tough, but I am not the one doing it :)
I think the rear of the frame at the axle is 2" wider than front, so you may have to cut upper A-frame and shorten it, lower can just go in farther toward the middle

You could use the stock torsion bars, running forward, as suspension, not sure there would be enough room for a strut setup in wheel well.
You would need custom axles most likely, to match length and splines between Ranger hub and IRS differential.
But it is an 8.8" differential so there might be matchups
 
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pjtoledo

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the GM trucks used a conventional front straight axle with the differential relocated to fit/work in the rear steer setup. the axles were wider to push the wheels out farther to clear the leaf springs when turned. easy to spot from the rear because the knuckle mounts are exposed.

they are fantastic at parallel parking. the TV commercial showed a cute chickee wedging her truck in between 2 big bad bikers. :icon_thumby:


P. S.
are we still allowed to say "chickee"?
 

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rusty ol ranger

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the GM trucks used a conventional front straight axle with the differential relocated to fit/work in the rear steer setup. the axles were wider to push the wheels out farther to clear the leaf springs when turned. easy to spot from the rear because the knuckle mounts are exposed.

they are fantastic at parallel parking. the TV commercial showed a cute chickee wedging her truck in between 2 big bad bikers. :icon_thumby:


P. S.
are we still allowed to say "chickee"?
I always spot them by the half ass looking flareside box :icon_thumby:
 

Ranger850

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are we still allowed to say "chickee"?[/QUOTE]

Did we ever say " Chickee" to begin with? lol
 

Ranger850

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Denisefwd93

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Because the thread drifted into rear wheel steering and I thought this was rather appropriate in childish way, sometimes I wonder how humor escapes so many people,
why is this pic in this thread?
 

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