Re: BE axle Posi unit...
 

Here is a pic I took of a pic that I took years ago. The gears on the left are non posi, center are BE and right are standard posi. Notice the spiders are the same size for the non posi and the BE but they are bigger than the posi.

Re: BE axle Posi unit...
 

Yes, These are what is in my unit. I was interested in replacing the originals with new gears, if available.... https://www.yenko.net/ubbthreads/imag...lins/beers.gif

Re: BE axle Posi unit...
 

I guess I'm confused. Colvin's book says that a posi with gearing of 3.90:1 and up was an Eaton 4-series, with no mention of anything special for COPO's (p.303). This was the casting that I attached before. Cunneen makes no mention of the carrier guts being special. Attached is a photo of the inside of my carrier. It came out of my BE rear end. It is quite possable that it was swaped out sometime in the past, but I have no history of the car prior to 1989.
Thanks for your help, as I am now as curious as Mark.
Andy

Re: BE axle Posi unit...
 

This is the ring gear prior to dissasembly.
Andy

Re: BE axle Posi unit...
 

Yes,it is date coded (101)st day. Yes, the Small spiders are still available from GM over the counter. The larger axle spiders are not avaialble nor are the springs or spring plates.

Re: BE axle Posi unit...
 

Where is the date code located? Also, could you tell from the pictures that I attached if this was the original carrier? Thanks for your help.
Andy : https://www.yenko.net/ubbthreads/imag...s/confused.gif

Re: BE axle Posi unit...
 

Where did the first day start in the Calendar year; for example: Sept, Aug, July-68? https://www.yenko.net/ubbthreads/imag...lins/beers.gif

Re: BE axle Posi unit...
 

[ QUOTE ]
Where did the first day start in the Calendar year; for example: Sept, Aug, July-68?

[/ QUOTE ]

This might help:

1968, 1969, and 1970 Julian Dates

101st day 1968 = Wednesday April 10, 1968