"Free wheeling" tires off the ground, or in snow or ice etc., at high speeds does what to an axle?
High RPM's on no load axle...what happens?
- Thread starter Greaser
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You mean like my Dodge mini-van did twice,sending the pinion shaft thru the entire transmission case
Driving home in a horrible snowstorm blew out my BMW rear end in a few hours. It's **** on spider gears, to have one side spinning, and the other stationary.
Positraction differentials help immensely
Positraction differentials help immensely
I don't get it. Open diff(not posi), no/low load, well lubed, with gears working like gears do, and they blow? They put up with horrid abuse during hard starts and while running under deep throttle without problem. Anyone out there who can 'splain it to me. Use big words if you wanna. I have some engineering background.
Main problem I have seen are the cross shaft/spider shaft and spider gears wallowing out and getting loose. I have seen a fair share of torn up cross shafts. The cross shaft galls, welds to the spider and tears loose/breaks and makes it's own path. There really is no "bearing" per se between the spider and cross shaft, it is just steel on steel and when you get one spinning on the other for any amount of time it galls them both.
Differential internals are made to cope with stress, but not much speed delta between moving parts. Excapt for the pinion bearings and case bearings, there isn't much movement occurring during normal operation (internal to the diff case).
Once in awhile you will get a side gear that will gall the diff case as well.
I do not miss rebuilding them.
Differential internals are made to cope with stress, but not much speed delta between moving parts. Excapt for the pinion bearings and case bearings, there isn't much movement occurring during normal operation (internal to the diff case).
Once in awhile you will get a side gear that will gall the diff case as well.
I do not miss rebuilding them.
Makes sense. Thanks.
Differential gears don't turn, or turn very little, in relation to each other in normal driving. The load is applied at 90 degrees, and not through turning gearsets.
Only when taking a turn is there a difference between left and right, and one will rotate around the other a little.
When wheelspinning, one side is stationary, and the other is rotating madly around. This wipes out oil quickly on the bearing cups, and the gears don't take well to this kind of movement - they will pit, chip, and gall.
Only when taking a turn is there a difference between left and right, and one will rotate around the other a little.
When wheelspinning, one side is stationary, and the other is rotating madly around. This wipes out oil quickly on the bearing cups, and the gears don't take well to this kind of movement - they will pit, chip, and gall.
Also, when unloaded (particularly on stands), there's all sorts of torsional things happening to the axles withthat great big flywheel (wheel hanging on the end). That can load and unload teeth with great rapidity.
But I do think that single wheel burnouts are murder on them. Spinning on gravel, then hitting tarmac...another thing altogether.
But I do think that single wheel burnouts are murder on them. Spinning on gravel, then hitting tarmac...another thing altogether.
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