John Rogers Posted June 13, 2016 Report Posted June 13, 2016 (edited) Good morning all, I have a 1949 B1B and the rear end housing has 11 studs rather than 10 like Im used to seeing. I have read on here that some do have the 11 stud housing but what is the difference between the two other than the number of fasteners? The gentleman I bought my truck from was the second owner and when I asked him about it he told me that it is the original rear end that came in it.He bought it in 1983 from the first owner which was the local school district here in Benson. Im getting ready to replace the inner and outer axle seals on it and I want to make sure that the seals that I buy are correct. With mine having the 11 hole third member will the axle bearing still be the same? Andy Bernbaum has the inner and outer seals for $9.50 each plus shipping. I gave them a call to check on them and they said that they are neoprene as well. I would really appreciate any insight on that that you can offer. Thank you, John Edited June 13, 2016 by John Rogers Quote
jpartington Posted June 13, 2016 Report Posted June 13, 2016 (edited) So are you referring to the differential cover? If so isn't the 11th bolt would be the lowest bolt? It is halfway in between 2 of the normally spaced bolts. I believe this is just a drain bolt. Anyone correct me if I'm wrong. Edited June 13, 2016 by jpartington 1 Quote
John Rogers Posted June 13, 2016 Author Report Posted June 13, 2016 Im sorry, I should not have said bolts.The housing has 11 studs. The rear end does not have a cover. 8 3/4 mopar or 9" ford with the removable third member/gear set. The rear diff in my truck looks just like the standard rear end for a B1B but instead of using 10 studs to secure the third member it uses 11. John Quote
jpartington Posted June 13, 2016 Report Posted June 13, 2016 Maybe I misunderstood, I'm not sure on that then. Quote
John Rogers Posted June 13, 2016 Author Report Posted June 13, 2016 (edited) The mistake is all mine. Studs and bolts are two different animals and I should have thought out and worded my question better . I do appreciate your reply, thank you . John Edited June 13, 2016 by John Rogers Quote
John Rogers Posted June 13, 2016 Author Report Posted June 13, 2016 I decided to call Bernbaums and ask them and they were able to answer my question so mow my inner and outer seals are on the way. I have a bad tendency to over think things and make things far more complicated than they need to be. John Quote
NiftyFifty Posted June 13, 2016 Report Posted June 13, 2016 A good hammer and chisel and you can have the standard 10 bolt design...LOL but most likely was just two different production runs and possibly another company that used that diff, but had 11 studs for their design..or an older version of the same axle and it was pulled as they used up stock, but good to know you found your seals. Sadly drain holes were not thought of in most mopar diff a that I've seen...my 67 Monaco doesn't have one and you have to suck out the fluid, which isn't ideal IMO 1 Quote
John Rogers Posted June 13, 2016 Author Report Posted June 13, 2016 That sounds like very likely. It wouldn't surprise me in the least to see parts used from different lots or production runs. As far as the rear end housing, there is a drain plug on the bottom right of the housing. When I was in still in HS I remember backing off the nuts that hold the third member and popping it loose to let the gear oil drain into one of Moms roasting pans while I was swapping out gears on my 69 Charger. It never even dawned on me to use a pump to remove the gear lube, Funny how that pan never surfaced again in the kitchen for some reason. I think it might have ended up getting "lost" permanently. I dont think Mom would have understood at all had she known. Luckily she had two of them John 1 Quote
NiftyFifty Posted June 13, 2016 Report Posted June 13, 2016 Sadly mine has no plug, but when I get ambitious and change the rear diff out to a different gear set, I'll drill and tap one in to that housing, or the spare I have from the exact same model/yr car. Finding 1967 Monaco parts is about as much fun as finding 48-53 Dodge side mirror brackets. Quote
Dodgeb4ya Posted June 14, 2016 Report Posted June 14, 2016 All the 1/2 and 3/4 ton trucks should use 11 studs to mount the differential. I Double checked this in three different dodge truck parts lists and from my history of swapping lots of rear ends. 11 stud truck differentials/housings are the same size as on all 1940's and early 50's Plymouth, Dodge, DeSoto and six cylinder Chryslers. 10 Stud ( larger Diameter Gasket size) differential's are the bigger heavier ones used in long wheel base Dodge, DeSoto and Chrysler wagons, all 8 passenger sedans , Saratoga and NewYorker 8 cylinder heavy cars. Why you have a 10 bolt in your 1/2 ton PU beats me! 1 Quote
John Rogers Posted June 14, 2016 Author Report Posted June 14, 2016 (edited) All the 1/2 and 3/4 ton trucks should use 11 studs to mount the differential. I Double checked this in three different dodge truck parts lists and from my history of swapping lots of rear ends. 11 stud truck differentials/housings are the same size as on all 1940's and early 50's Plymouth, Dodge, DeSoto and six cylinder Chryslers. 10 Stud ( larger Diameter Gasket size) differential's are the bigger heavier ones used in long wheel base Dodge, DeSoto and Chrysler wagons, all 8 passenger sedans , Saratoga and NewYorker 8 cylinder heavy cars. Why you have a 10 bolt in your 1/2 ton PU beats me! Mine has 11 so it appears that the one in mine is correct . For some reason I was under the mistaken impression that 10 was the norm and that for some reason the 11 stud rear end in mine might have been a oddity. Every time I tried to order a new gasket for the third member from both of the local auto parts stored here etc they all had 10 holes in them so Im sure thats what caused my confusion. My Dad had a '49 Pilothouse when I was a kid, in fact I learned to drive in it. Most of our driving here is hwy so a number of years later I swapped out the original rear end for the rear end out of a '69 Polara Mississippi state trooper cruiser which I had laying around in it. Man those were high gears.Probably too high but it worked. Dads truck has been gone since the mid 80s . I got this one because it reminds me of my Dad even though it isnt the same exact truck. Actually the one I have now is in much much better condition than Dads was. I loved driving Dads truck and ever since I was very young I have always had a thing for old vehicles. It might sound strange but having it is comforting and makes me feel a bit closer to him. Thank you everyone for the help and replies. You all have been a huge help. Its been such a long time since I had Dads truck around Im having to relearn or more to the point.... remember a lot of things which I forgot and Im loving every minute of it. John Edited June 14, 2016 by John Rogers 1 Quote
Jocko_51_B3B Posted July 12, 2016 Report Posted July 12, 2016 I have a 1951 b3b and yesterday for the first time I removed the differential. (My truck is still in pieces so I have the rear end on my workbench.) Mine also has 11 studs with a drain plug on the right side. Has anyone checked with Bernbaum or Roberts to see if they have the 11 hole gasket? Since the rear end is on my bench and easy to work on, are there any other parts worth replacing other than inner and outer seals? Quote
Brent B3B Posted July 12, 2016 Report Posted July 12, 2016 I have a 1951 b3b and yesterday for the first time I removed the differential. (My truck is still in pieces so I have the rear end on my workbench.) Mine also has 11 studs with a drain plug on the right side. Has anyone checked with Bernbaum or Roberts to see if they have the 11 hole gasket? Since the rear end is on my bench and easy to work on, are there any other parts worth replacing other than inner and outer seals? I made mine from bulk gasket material similar to this http://m.autozone.com/sealants-glues-adhesives-and-tape/gasket-material/fel-pro-10-x-26-x-1-16-in-cork-and-rubber-gasket-material-sheet/67679_0_0?location= Used the old gasket as a template and a hole punch set.... 2 Quote
JBNeal Posted July 12, 2016 Report Posted July 12, 2016 Inspect the differential bearings and races for galling and corrosion...these parts are prone to failure after sitting for several years and the housing collects condensation... Also check the differential preload and backlash for excessive wear 1 Quote
Jocko_51_B3B Posted July 13, 2016 Report Posted July 13, 2016 Brent, Looks like the 10" gasket width from Autozone will fit perfectly. JB, Thanks for your advice. (And I was lucky not to find any corrosion or evidence of water!) Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.