welding auto hubs

[Jspafford]

You may get a small amount of 'jerk' when turning at full lock. This is caused by the ujoints and yokes operating at full angle and is normal.

Otherwise, it is like having manual hubs locked all the time (I've had mine locked for almost 2 months) or using drive flanges.

 

[Jspafford]

the Live axle setups they have now have ferofluids which act like a third differential between the front and rear axles. . so don't run the 4x4 on dry clean pavement with the older style 4x4s.

Or thats my understanding anyways.

No, the newer style still cannot be used on pavement either. There is no 'third differential'. Just a standard Dana 35.

 

[LittleHorse]

No, the newer style still cannot be used on pavement either. There is no 'third differential'. Just a standard Dana 35.

sounds like he's talking about an AWD style system with a center differential or viscous coupling in the transfer case.

 

[BRUTUS_T_HOG]

why exactly did they start doing that anyway? Cheaper to manufacture I'm sure, but seems like the gas mileage would suffer.

they did it to eliminate the unreliable auto hubs, and to make shifting into 4wd very very easy. its the same process happening inside a manual transmission to make it smoother.

 

[Black_Splash]

I hubs stay locked most of the time. I don't notice any binding.

 

[feellnfroggy]

No, the newer style still cannot be used on pavement either. There is no 'third differential'. Just a standard Dana 35.

The newer style CAN be used onpavement just not fulltime. This is how the Auto4wd works in the explorers and expeditions. Its also part of the traction control system. If it didnt work on the pavement it wouldnt be an option on the vehicle. Older "true"(for lack of a better word) 4x4 cant be locked in on pavement though. The hubs however can due to open diff. Just look at the humvee, its a manual shift 4x4 with fulltime locked (not selectable) hubs. I have used 4 hi on the road with a hummer though but never 4 low.

 

[4x4junkie]

That's because the Explorer has a third differential in the t-case (or maybe it's a viscous coupling, I forget). The Ranger's 1354 case does NOT have this, therefore it's NOT suitable for use on dry pavement at all.

 

[AllanD]

That's because the Explorer has a third differential in the t-case (or maybe it's a viscous coupling, I forget). The Ranger's 1354 case does NOT have this, therefore it's NOT suitable for use on dry pavement at all.

Nope no third diff in the T-case, but 4wd-Auto only engages momentarily and the T-case has no actual "mechanical lockup" in that mode it is all done with a larger version of what was the "spin-up clutch" that was used in the 13-50 & 13-54 electric shift t-cases.
Basically by using the electromagnetic clutch in a "momentary mode" it mimics
being an "awd" system, engage the front for a second or so then a CLEAN release (no mechanical lockup

The 5.0 AWD explorer doesn't have a "Center diff" either, they simply installed a viscous coupling in the power path to the front axle to release windup tension (the rear axle is solidly connected through the t-case)

The Dana TC28 T-case (AWD Aerostar) DOES have a center dif, but it's
"Regulated" by an electromagnetic lockup clutch.
The system on those keeps comparing the front output to the rear output and if it varies more than a certain percentage it applies power to the clutch for three seconds

AD

 

[Jspafford]

The newer style CAN be used onpavement just not fulltime. This is how the Auto4wd works in the explorers and expeditions. Its also part of the traction control system. If it didnt work on the pavement it wouldnt be an option on the vehicle. Older "true"(for lack of a better word) 4x4 cant be locked in on pavement though. The hubs however can due to open diff. Just look at the humvee, its a manual shift 4x4 with fulltime locked (not selectable) hubs. I have used 4 hi on the road with a hummer though but never 4 low.

Your right...but your not comparing apples to apples.

The Auto4WD system does not use the 1350 or the 1354 case...therefore it is not the same in any way.

 

[riverviewcontracting]

ya you will wreck the transfer case becase if you drive to far with the hubs locked the front saft bering will not get enough fluid to it and will burn up i have seen it done on dodge, jeep, chevy and ford

 

[LittleHorse]

ya you will wreck the transfer case becase if you drive to far with the hubs locked the front saft bering will not get enough fluid to it and will burn up i have seen it done on dodge, jeep, chevy and ford

The 1350 and 1354, to the best of my knowledge, have the fluid pump on the rear output shaft, meaning as long as the rear driveshaft is spinning, it's getting fluid.

 

[4x4junkie]

Nope no third diff in the T-case, but 4wd-Auto only engages momentarily and the T-case has no actual "mechanical lockup" in that mode it is all done with a larger version of what was the "spin-up clutch" that was used in the 13-50 & 13-54 electric shift t-cases.
Basically by using the electromagnetic clutch in a "momentary mode" it mimics
being an "awd" system, engage the front for a second or so then a CLEAN release (no mechanical lockup

The 5.0 AWD explorer doesn't have a "Center diff" either, they simply installed a viscous coupling in the power path to the front axle to release windup tension (the rear axle is solidly connected through the t-case)

The Dana TC28 T-case (AWD Aerostar) DOES have a center dif, but it's
"Regulated" by an electromagnetic lockup clutch.
The system on those keeps comparing the front output to the rear output and if it varies more than a certain percentage it applies power to the clutch for three seconds

AD

The AWD case was the one I was thinking of. I had forgot about the electromechanical clutch one though.

 

[riverviewcontracting]

The 1350 and 1354, to the best of my knowledge, have the fluid pump on the rear output shaft, meaning as long as the rear driveshaft is spinning, it's getting fluid.

yes but it doesn't get enough fluid to the front bearing and it seizes up

 

[Black_Splash]

yes but it doesn't get enough fluid to the front bearing and it seizes up

So are you saying it's not a good idea to have the front hubs locked in when not in 4wd?

 

[4x4junkie]

yes but it doesn't get enough fluid to the front bearing and it seizes up

Never had that happen