Posi Traction Stock Rear Axle - The 1947 - Present Chevrolet & GMC Truck Message Board Network

apachetrucks · 02-02-2005, 06:22 PM

Will The Stock Rear End In 60/61 1/2 Ton Pickup Convert To A Limited Slip Posi Set Up Without Changing The Housing???i Removed The Inspection Plate And Took A Look At What Is There Now And The Ring Gear Has 12 Bolts In It.the Code On The Rear Carrier Is "ma".any Help Is Appreciated.thanks

60-66 Nut · 02-03-2005, 10:16 AM

If it's the original 60-62 rear axle with a removable chunk and a rear cover, then it may be difficult to find limited slip or posi-trac parts to fit it. Later 12 bolt(63 up) axles are completely different. 12 bolt refers to the number of bolts in the cover. Hope that helps.

60-66 Nut

short66sickfleet · 02-03-2005, 02:12 PM

:tj: Can anyone help with this Question? Original 60 chevy axle, What do the #'s on the third member mean? Anything? They are:3707340,& under that are D 2. I would apreciate the help....Sorry for jacking the thread.thanks. She needs some love..

apachetrucks · 02-03-2005, 02:23 PM

More information that I discovered.The 1960 GM shop manual has about 20 or so pages of information on the stock rearend and 2 pages on the Posi.Basically the 2 pages states that Eaton posi is available as an option and that the basic service is the same for both rearends and that the housing is the same for both,then it goes on to show an exploded view of the posi unit.
I noticed that the ring gear attaches to the Posi with 10 bolts whereas in the stock unit the ring gear has 12 bolts.This seems bassacwards to me!
I always thought that the ring and pinion where heavier and larger and would not fit in a standard housing?????
HELP!!!!! I know some of you are running with Posi's and any guidance or suggestions would be greatly appreciated.Thanks

apachetrucks · 02-03-2005, 02:59 PM

Hey Short66sickfleet,the number you gave looks to be a part number for the 3rd member,maybe someone with a parts book can help.The actual code for the gear ratio and designation of the rearend (that is stock or posi) is located on the other side of the housing and its very hard to locate.I took a steel brush to mine and was finally able to get her clean enough to read.You will be looking for a 2 digit code and here is what that will tell you provided its stock. MA or MD=3.90 RATIO ALL 1/2 TON EXCEPT POSI,MB or ME= ALL 3.38 RATIO,MC or MF 3.90 POSI 1/2 TON.
Hope this helps

short66sickfleet · 02-03-2005, 08:18 PM

cool, thanks that does help. now I know what i need to look for. wire brush is in my hands.

xextr3m3 · 02-03-2005, 11:51 PM

They can be found, the rear end in my current truck (62)has a posi, someone had it build recently also

apachetrucks · 02-04-2005, 10:37 AM

xextrm3m3,please look at the housing for me and see if it is 10 bolt cover and also if it is the one piece housing.Thanks for your input.

xextr3m3 · 02-04-2005, 10:25 PM

It's an Eaton rear end. 10 bolts on the removeable cover. probibly ten on the third member also

bpmcgee · 02-05-2005, 03:18 AM

My 1960 parts catalog doesn't have a section for the rear axle. Neither does it have a listing for that part number. So, my post here is pretty pointless isn't it?

02-02-2005, 06:22 PM	#1
apachetrucks Registered User Join Date: Jan 2005 Posts: 40	Posi Traction Stock Rear Axle Will The Stock Rear End In 60/61 1/2 Ton Pickup Convert To A Limited Slip Posi Set Up Without Changing The Housing???i Removed The Inspection Plate And Took A Look At What Is There Now And The Ring Gear Has 12 Bolts In It.the Code On The Rear Carrier Is "ma".any Help Is Appreciated.thanks

02-03-2005, 10:16 AM	#2
60-66 Nut Professional Beer Tester Join Date: Aug 2004 Location: Louisiana Posts: 453	If it's the original 60-62 rear axle with a removable chunk and a rear cover, then it may be difficult to find limited slip or posi-trac parts to fit it. Later 12 bolt(63 up) axles are completely different. 12 bolt refers to the number of bolts in the cover. Hope that helps. 60-66 Nut __________________ 60 Ford F100 Custom Cab 61 Apache Short Fleetside 64 C10 Short Stepside 65 C80 409 V8 5spd(X-Firetruck) 83 GMC 350 Olds Diesel 85 GMC Short Bed 86 GMC Short Bed 90 GMC R3500 Crew Cab 92 GMC 1500

02-03-2005, 02:12 PM	#3
short66sickfleet Registered User Join Date: Jan 2005 Location: So.CAL Posts: 22	:tj: Can anyone help with this Question? Original 60 chevy axle, What do the #'s on the third member mean? Anything? They are:3707340,& under that are D 2. I would apreciate the help....Sorry for jacking the thread.thanks. She needs some love.. Attached Images __________________ My fleet..... 1958 Apache s.b fleetside,tubbed,clipped,nailed. 1966 s.b fleetside,tubbed,disc,air half way done. 1960 l.b fleetside,orginal#matching,soon tb copped,& stay original#match truck.

02-03-2005, 08:18 PM	#6
short66sickfleet Registered User Join Date: Jan 2005 Location: So.CAL Posts: 22	cool, thanks that does help. now I know what i need to look for. wire brush is in my hands. __________________ My fleet..... 1958 Apache s.b fleetside,tubbed,clipped,nailed. 1966 s.b fleetside,tubbed,disc,air half way done. 1960 l.b fleetside,orginal#matching,soon tb copped,& stay original#match truck.

02-03-2005, 11:51 PM	#7
xextr3m3 Registered User Join Date: Aug 2003 Location: Fremont, CA Posts: 96	They can be found, the rear end in my current truck (62)has a posi, someone had it build recently also __________________ 62 c10 short fleet 350/350 dropped 87 toy: SAS 35" MT/R's, 5.29's, detroit rear, exocage

02-03-2005, 02:23 PM	#4
apachetrucks Registered User Join Date: Jan 2005 Posts: 40	More information that I discovered.The 1960 GM shop manual has about 20 or so pages of information on the stock rearend and 2 pages on the Posi.Basically the 2 pages states that Eaton posi is available as an option and that the basic service is the same for both rearends and that the housing is the same for both,then it goes on to show an exploded view of the posi unit. I noticed that the ring gear attaches to the Posi with 10 bolts whereas in the stock unit the ring gear has 12 bolts.This seems bassacwards to me! I always thought that the ring and pinion where heavier and larger and would not fit in a standard housing????? HELP!!!!! I know some of you are running with Posi's and any guidance or suggestions would be greatly appreciated.Thanks

02-03-2005, 02:59 PM	#5
apachetrucks Registered User Join Date: Jan 2005 Posts: 40	Hey Short66sickfleet,the number you gave looks to be a part number for the 3rd member,maybe someone with a parts book can help.The actual code for the gear ratio and designation of the rearend (that is stock or posi) is located on the other side of the housing and its very hard to locate.I took a steel brush to mine and was finally able to get her clean enough to read.You will be looking for a 2 digit code and here is what that will tell you provided its stock. MA or MD=3.90 RATIO ALL 1/2 TON EXCEPT POSI,MB or ME= ALL 3.38 RATIO,MC or MF 3.90 POSI 1/2 TON. Hope this helps

02-04-2005, 10:37 AM	#8
apachetrucks Registered User Join Date: Jan 2005 Posts: 40	xextrm3m3,please look at the housing for me and see if it is 10 bolt cover and also if it is the one piece housing.Thanks for your input.

02-04-2005, 10:25 PM	#9
xextr3m3 Registered User Join Date: Aug 2003 Location: Fremont, CA Posts: 96	It's an Eaton rear end. 10 bolts on the removeable cover. probibly ten on the third member also __________________ 62 c10 short fleet 350/350 dropped 87 toy: SAS 35" MT/R's, 5.29's, detroit rear, exocage

02-05-2005, 03:18 AM	#10
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	My 1960 parts catalog doesn't have a section for the rear axle. Neither does it have a listing for that part number. So, my post here is pretty pointless isn't it?



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.