kendall Posted August 30, 2017 Report Share Posted August 30, 2017 My 47 came with this rear-end and was told it was not a Dodge. Any input is appreciated. Quote Link to comment Share on other sites More sharing options...
Merle Coggins Posted August 30, 2017 Report Share Posted August 30, 2017 It appears to have the DPCD (Dodge, Plymouth, Chrysler, DeSoto) logo, so I would say it is likely a Mopar axle. Quote Link to comment Share on other sites More sharing options...
WarriorDog Posted August 30, 2017 Report Share Posted August 30, 2017 WOW!!! Nice, clean underside on that vehicle! Can't help with identifying the rear end, though. Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted August 30, 2017 Report Share Posted August 30, 2017 (edited) that rear carrier is a later model 8 3/4 Mopar.........the 742 casting as it is commonly referred to in the muscle car arena...the pinion snubber is a dead give away to later application... Edited August 30, 2017 by Plymouthy Adams 1 Quote Link to comment Share on other sites More sharing options...
LazyK Posted August 30, 2017 Report Share Posted August 30, 2017 742, the mid size pinion diameter of the 8-3/4 MOPAR. 741 and 489 are the other two casting numbers 1-3/4" large stem pinion (aka. '742')Carrier casting numbers: 1634985 (1957-1964), 2070742 (~1961-1969). This assembly was replaced by a phase-in of the 1-7/8" pinion starting in the 1969 model year. 1970 RW (Plymouth and Dodge mid-size) were the last models to use the 1-3/4" which appeared in a 2881489 case. This assembly was typically used in high weight/medium horsepower applications through high weight/high horsepower applications. 1 Quote Link to comment Share on other sites More sharing options...
kendall Posted August 31, 2017 Author Report Share Posted August 31, 2017 Thanks for the info. I'm glad it's mopar and more than enough to handle the original flathead. Now, does anyone want to speculate on the ratio and whether it could be posi-trak? Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted August 31, 2017 Report Share Posted August 31, 2017 it will never ever be a posi-track......now a sure grip could be in the question........ Quote Link to comment Share on other sites More sharing options...
John Rogers Posted August 31, 2017 Report Share Posted August 31, 2017 (edited) 1 hour ago, kendall said: Thanks for the info. I'm glad it's mopar and more than enough to handle the original flathead. Now, does anyone want to speculate on the ratio and whether it could be posi-trak? I don't know if it is still there or not but they originally had a small metal tag with the ratio stamped into it attached to one of the upper mounting studs that pass thru the third member / pumpkin. John Edited August 31, 2017 by John Rogers Quote Link to comment Share on other sites More sharing options...
LazyK Posted August 31, 2017 Report Share Posted August 31, 2017 16 hours ago, kendall said: Thanks for the info. I'm glad it's mopar and more than enough to handle the original flathead. Now, does anyone want to speculate on the ratio and whether it could be posi-trak? If the tags are not there jack up with both rear wheels off the ground. trans in neutral spin one wheel by hand if the other wheel turns the same direction you have a sure grip. if the opposite wheel turns in the opposite direction you have an "open" differential. while jacked up turn one wheel by hand, one revolution, and count the number of time the drive shaft turns. 3-1/4 turns of the drive shaft =3.23, 3-1/2 turns =3.55, 2-3/4 turns = 2.73, almost 4 turns =3.91 these are the common MOPAR ratios 1 Quote Link to comment Share on other sites More sharing options...
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