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Need help with 8 3/4 identification #1086983 10/02/11 08:00 PM 10/02/11 08:00 PM
Joined: Jan 2007 Posts: 125 Stockbridge, GA 7 7D9LRE OP member
7D9LRE OP member 7 Joined: Jan 2007 Posts: 125 Stockbridge, GA	I've got an 8 3/4 out of a '67 Monaco that does not have casting numbers. Is there a way to identify which case this is without taking it apart to measure the pinion diameter? Numbers on the ring gear: BRJ 11-66, DMS277, HELIXFORM 2070684 2.76

Re: Need help with 8 3/4 identification [Re: 7D9LRE] #1086984 10/02/11 09:10 PM 10/02/11 09:10 PM
Joined: Aug 2003 Posts: 12,291 Kent, Wa 340SHORTY Truck Nut
340SHORTY Truck Nut Joined: Aug 2003 Posts: 12,291 Kent, Wa	741 or poss a 742 I am truckless..

Re: Need help with 8 3/4 identification [Re: 7D9LRE] #1086985 10/02/11 09:13 PM 10/02/11 09:13 PM
Joined: Jul 2008 Posts: 30,469 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,469 Florida STAYcation	PROBABLY so much grease or dirt build-up hiding those #'s ... but it is probably a 741. NOTHING wrong with that.

Re: Need help with 8 3/4 identification [Re: 7D9LRE] #1086986 10/02/11 11:58 PM 10/02/11 11:58 PM
Joined: Aug 2003 Posts: 43,274 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,274 Bend,OR USA	Try scraping and cleaning on the drivers side of the housing under where the pinion gears is I have not seen a Mopar third member in 40 yrs that didn't have a casting number there I'm thinking it is probally a 741 due to the 2.76 ratio but it might be a 742 Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Need help with 8 3/4 identification [Re: 7D9LRE] #1086987 10/03/11 10:23 AM 10/03/11 10:23 AM
Joined: Sep 2003 Posts: 1,688 Marlboro, NY, USA R Rick_Ehrenberg top fuel
Rick_Ehrenberg top fuel R Joined: Sep 2003 Posts: 1,688 Marlboro, NY, USA	That part number is 8.75 X 1.875" stem, i.e., ...489 case. Home run. Rick

Re: Need help with 8 3/4 identification [Re: Rick_Ehrenberg] #1086988 10/03/11 10:48 AM 10/03/11 10:48 AM
Joined: Jul 2008 Posts: 30,469 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,469 Florida STAYcation	Quote: That part number is 8.75 X 1.875" stem, i.e., ...489 case. Home run. Rick 489 ?.. possible ... but the 2.76 gear that is now in my 62 is a 741 case ...and it came out of a 74 Monaco.

Re: Need help with 8 3/4 identification [Re: Rick_Ehrenberg] #1086989 10/03/11 05:24 PM 10/03/11 05:24 PM
Joined: Jan 2003 Posts: 25,933 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,933 Rio Linda, CA	Quote: That part number is 8.75 X 1.875" stem, i.e., ...489 case. Home run. Rick The 2070684 ring gear was used in the 741, 742 and 489 cases; the 11-66 date on the gear pretty much narrows it down to a 741 or 742 because the 489 didn't arrive until late '68. The INTERNET, the MISinformation superhighway

Re: Need help with 8 3/4 identification [Re: John_Kunkel] #1086990 10/03/11 08:58 PM 10/03/11 08:58 PM
Joined: Jan 2007 Posts: 125 Stockbridge, GA 7 7D9LRE OP member
7D9LRE OP member 7 Joined: Jan 2007 Posts: 125 Stockbridge, GA	Thanks for the replies. Here's a cell phone pic. Last edited by 7D9LRE; 10/03/11 09:10 PM.

Re: Need help with 8 3/4 identification [Re: dOc !] #1086991 10/03/11 11:26 PM 10/03/11 11:26 PM
Joined: Sep 2003 Posts: 1,688 Marlboro, NY, USA R Rick_Ehrenberg top fuel
Rick_Ehrenberg top fuel R Joined: Sep 2003 Posts: 1,688 Marlboro, NY, USA	Sorry, that was a ring gear that was used in combo with a few different pinions, as stated. Rick

Re: Need help with 8 3/4 identification [Re: 7D9LRE] #1086992 10/03/11 11:59 PM 10/03/11 11:59 PM
Joined: Aug 2003 Posts: 43,274 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,274 Bend,OR USA	Quote: Thanks for the replies. Here's a cell phone pic. you just reinforced what I tell a lot of people about Mopar cars and parts, never say never Thanks Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: Need help with 8 3/4 identification [Re: Cab_Burge] #1086993 10/04/11 01:06 AM 10/04/11 01:06 AM
Joined: Feb 2010 Posts: 18,493 Granite Bay CA Kern Dog Striving for excellence
Kern Dog Striving for excellence Joined: Feb 2010 Posts: 18,493 Granite Bay CA	The Phantom chunk..... Thats spooky!

Re: Need help with 8 3/4 identification [Re: Kern Dog] #1086994 10/04/11 05:23 AM 10/04/11 05:23 AM
Joined: Jan 2003 Posts: 21,668 San Jose,CA migsBIG YouTube is my go-to news source
migsBIG YouTube is my go-to news source Joined: Jan 2003 Posts: 21,668 San Jose,CA	there were a few units without numbers on them, but pretty rare. Heard they might have been used for off road/racing use. When there were left over stock, they were put into production cars to clean out remaining inventory. I noticed that the case looks silver. Could be factory non-number, aluminum/magnesium case/modified stock unit. [IMG]http://i130.photobucket.com/albums/p265/migsbig/Hippo_skull_dark-1.jpg[/IMG]

Re: Need help with 8 3/4 identification [Re: migsBIG] #1086995 10/04/11 10:20 AM 10/04/11 10:20 AM
Joined: Jan 2003 Posts: 75,082 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,082 U.S.S.A.	Quote: there were a few units without numbers on them, but pretty rare. Heard they might have been used for off road/racing use. When there were left over stock, they were put into production cars to clean out remaining inventory. I noticed that the case looks silver. Could be factory non-number, aluminum/magnesium case/modified stock unit.

Re: Need help with 8 3/4 identification [Re: migsBIG] #1086996 10/04/11 10:23 AM 10/04/11 10:23 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: Could be factory non-number, aluminum/magnesium case/modified stock unit. I'd kill for one of those (in a 742 case) live every 24 hour block of time like it's your last day on earth

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