Back when Eddo came up with the idea of a reinforcing collar for the front differential - he used a steel McMaster part 60665K61 and machined/sanded the inside to match the differential.
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?t=5187&highlight=diff+collar

I ordered one but never got around to installing it - and then there was a group buy for an Aluminum version - well the Aluminum was too large and didn't fit CRD's




Well over the holidays I finally tried installing the steel version and it seems to fit - close to the frame but no rattles (street driving right now)

_________________
2005 CRD
stuff
Skeptic quod gratis asseritur, gratis negatur

Did you have to do anything special to slip the collar into place? That is a very tight fit.

_________________
2005 Liberty Sport CRD, Lt Khaki, sunroof

Thankful to now be an EX-CRD owner.

Well - I had the diff out to put the Truetrac in and bolted on the collar at the same time - I think there's room to slip it around - but I didn't try that.

_________________
2005 CRD
stuff
Skeptic quod gratis asseritur, gratis negatur

Do these accually work?

_________________
2003 liberty sport v-6 5spd
light khaki
frankenlift
als arm's
rusty'sdiff cover
rusty's lower rear arms
rusty's skids and custom shackle's
rusty's rock rails
rusty's air tube
magnaflow exhaust
trueflow cone filter
throttle body spacer
oem renegade fog light's
bf goodrich 245/75/16 all terain ko
16X8 cragar black d's

The best answer is that no one knows for sure, it's a precaution, costs about $50 and some time maching/sanding.
I've fairly sure no one with the collar has broken a Differential case, and a couple of them have been wheeled fairly hard.
However I've only heard of a few people (4 or 5?) breaking the case without it - a fairly small percentage.
So to prove it you'd need a statistically significant sample - over a statistically significant timeframe - that hasn't happened.

_________________
2005 CRD
stuff
Skeptic quod gratis asseritur, gratis negatur