CRG Discussion Forum

Camaro Research Group Discussion => Restoration => Topic started by: R68GTO on June 11, 2019, 12:09:36 AM

Title: BE COPO rear questions
Post by: R68GTO on June 11, 2019, 12:09:36 AM

Working on cleaning up my BE rear and have a couple of questions.  Is this the correct pinion yoke for a COPO application?  I've read where the joints should be held by straps/bolts instead of u-bolts like this one?  Also noticed a "58" mark above the cast date tag.  Anyone know what that is for?  And, finally, Noticed a "D" stamped below and left of the BE stamp.....any idea what that is for?

Title: Re: BE COPO rear questions
Post by: william on June 11, 2019, 12:39:15 AM

Not the correct yoke for any '69 12 bolt. Should have the larger strap/cap screw yoke. That's why '69 drive shafts are slightly shorter.

Title: Re: BE COPO rear questions
Post by: R68GTO on June 11, 2019, 09:40:21 AM

Thanks William.  What part number should I be looking for?

Title: Re: BE COPO rear questions
Post by: william on June 11, 2019, 02:00:59 PM

The original part number was 3954393. I'm sure it was a vendor sourced part, maybe from Dana. Likely still available from drivetrain suppliers.

Title: Re: BE COPO rear questions
Post by: WorkinProgress on June 21, 2019, 10:26:20 PM

Part number 3954393 is the original part number. On February of 1972 it was superseded to 3996118. That part went discontinued on November, 2004.

                                       - Warren

Title: Re: BE COPO rear questions
Post by: z28z11 on June 22, 2019, 10:01:34 PM

Quote from: WorkinProgress on June 21, 2019, 10:26:20 PM

Part number 3954393 is the original part number. On February of 1972 it was superseded to 3996118. That part went discontinued on November, 2004.

                                       - Warren

Still around as reproductions form Yukon Gear. Used pop up on eBay (one for $50.00 on now)

https://www.ebay.com/itm/Yukon-Gear-Axle-YY-GM3996118-Pinion-Yoke/163704322782?epid=193131065&hash=item261d89bade:g:DooAAOSwfr5c5-1H

Regards,
Steve

Title: Re: BE COPO rear questions
Post by: R68GTO on June 23, 2019, 10:26:36 AM

Thanks everyone for your help both online and offline!  The appearance of the Yukon gear replacement is very different especially in the "inside area where the u-joint sits.  I found a good used original.....one less part on my list to get!