gear ratio

[HOrnbrod]

Not necessarily. The only positive way is to pull the cover and count the teeth of the R & P gears, then divide the number of ring teeth by the number of pinion teeth. Tags can sometimes lie.

[AW-100]

Yeah, an other positive way is to get the CAD to work, and try to drive in 4low...

[AW-100]

New Q:

 

How do you change the ratio of an axle? Is it enough to just pull out the driveshafts, yank out the differential and replace it with the new one?

[Pete M]

as nice as that would be, sadly no. gears need to be "set up" to run properly (a quick search for that should give you the details). it's not cheap, and not really good for beginners to tackle. one of the few things that I will happily leave to the pros. But that's not to say that i won't go out of my way to avoid paying for it. :D I prefer junkyard axles with the gears already in them. way cheaper and way easier. :) (unless you're looking for a ratio that doesn't exist out there)