Originally posted by ttektek
What is the advantages of a solid rear diff, as opposed to one a gear diff?
A solid axle should be used when two or more of this conditions are meet:
- Large flowing track.
- High traction (not as high to make you traction roll, but almost).
- Rear tyre wear isn't a issue (high abrassive tracks, beware: can destroy a rear tyre set on only 3 or 4 tanks).
- You have guts to control it (car handling change a lot).
Basically a solid axle eliminates the drag associated with a gear diff (and their differential action), also eliminates rotating weight (if it's fine crafted, but some units add weight).
Some handling aspects of the car are modified. You can nail the throttle without any kind of concerns that one wheel will slip and make you a donut, all the two rear wheel push the same (ever you have the same amount of toe-in and the two tyres are of the same diameter).
A side effect of lacking of differential action at the rear, some push will be experienced (that's why is used on high traction tracks). Tyre wear (rear) will be really fast (quite scary the first times).
Nailing throttle going out of turns will be some times kinda scary as you see the rear end slides (and the one you can do is pray and nail harder the throttle).
Probably you don't need a solid axle many times, you will be ok putting a thicker oil on the diff (I went up to 50K on my rear diff), only two times I went to a solid axle.
Probably are more, but this is mainly what is and how reacts a solid axle.