1973 Olds 98 12 bolt posi rare? interchanges with??
#1
1973 Olds 98 12 bolt posi rare? interchanges with??
I have access to this carrier at a local yard.
Are they rare or desirable with Big olds guys?
Is the carrier the same as the pontiac bigs in a 70 bonneville?
What can you tell me about these? WIW?? to sell?
Thanks
Are they rare or desirable with Big olds guys?
Is the carrier the same as the pontiac bigs in a 70 bonneville?
What can you tell me about these? WIW?? to sell?
Thanks
#2
Those are what I call the large 12-bolts. It's a 12-bolt cover,with a 12-bolt ring gear,but the guts inside are larger than a 12-bolt chevy,and will not interchange.It's a nice piece for someone with a fullsize car,wanting to have a posi.
#3
12 bolts
The rear pictured is a 12 bolt 'O' type FULL SIZE (12 bolt roaund symetrical cover and 12 bolts holding the ring gear in place) - They were used in the 1967-1976 Full size Olds. in 1971 -1976 all the big block FULL SIZE cars received this rear and the FULL SIZE wagons with BIG BLOCK MOTORS
31 spline bolt in axles (olds posi picture 1)
DO NOT confuse the A-bolt 'O' type 12 bolt (cutlass, 442) This rear has 12 bolt cover and 10 bolt guts)
The 1970 Bonneville and the 65 66 67 68 69 for that matter use the 8.875 FULL SIZE Pontiac 10 bolt cover 12 bolt ring gear rear. Rear cover and posi picture 2 and 3)
AGAIN the 10 bolt cover / 12 bolt ring PONTIAC FULL SIZE rear was used into the 1971-1977 Full Size cars and went from 31 spline to 28 spline and degraded from Bolt in axles to c-clip axles...
A-body GM cars had a optional 10 bolt cover 12 bolt gut 8.750 (derived from the older full size 10/12 rears) with a smaller 1.625 shaft (really the same as 10 bolt 8.5 shaft) They used a form of this axle assemble into the FULL SIZE caddies, olds, pontiac, etc. 1978-1984 85 ish That was as heavy duty as they had then... cars were not exactly putting out GOBS of HP in the late 70's and early 80's
31 spline bolt in axles (olds posi picture 1)
DO NOT confuse the A-bolt 'O' type 12 bolt (cutlass, 442) This rear has 12 bolt cover and 10 bolt guts)
The 1970 Bonneville and the 65 66 67 68 69 for that matter use the 8.875 FULL SIZE Pontiac 10 bolt cover 12 bolt ring gear rear. Rear cover and posi picture 2 and 3)
AGAIN the 10 bolt cover / 12 bolt ring PONTIAC FULL SIZE rear was used into the 1971-1977 Full Size cars and went from 31 spline to 28 spline and degraded from Bolt in axles to c-clip axles...
A-body GM cars had a optional 10 bolt cover 12 bolt gut 8.750 (derived from the older full size 10/12 rears) with a smaller 1.625 shaft (really the same as 10 bolt 8.5 shaft) They used a form of this axle assemble into the FULL SIZE caddies, olds, pontiac, etc. 1978-1984 85 ish That was as heavy duty as they had then... cars were not exactly putting out GOBS of HP in the late 70's and early 80's
Last edited by monzaz; November 2nd, 2011 at 11:58 PM.
#4
The rear pictured is a 12 bolt 'O' type FULL SIZE (12 bolt roaund symetrical cover and 12 bolts holding the ring gear in place) - They were used in the 1967-1976 Full size Olds. in 1971 -1976 all the big block FULL SIZE cars received this rear and the FULL SIZE wagons with BIG BLOCK MOTORS
http://www.drivetrainspecialists.com...ies/gm/gm-930/
#5
I have a 12bolt cover on my car. I havent checked into it more than counting the bolts. I figured I would get to it when I was at that point, but I am now curious - what would a desirable rear end be out of the olds options? I dont know alot about this so if the question is naive i apologize.
#6
I have a 12bolt cover on my car. I havent checked into it more than counting the bolts. I figured I would get to it when I was at that point, but I am now curious - what would a desirable rear end be out of the olds options? I dont know alot about this so if the question is naive i apologize.
#7
9.3 rear
Is this the 9.30" axle? If so, DTS sells parts:
http://www.drivetrainspecialists.com...ies/gm/gm-930/
http://www.drivetrainspecialists.com...ies/gm/gm-930/
Not the same as the 9.3 Full Size mid 60's to mid 70's 12 bolt cover 12 bolt ring 1966-1976. Which is a integral housing.... Not a third member housing like the 1964 and older car rears.
The 12 bolt 'o type pictured on the first post was used in OLDSmobiles only until 1970 then in 1971 it became the one for heavy duty application in all the buick Olds and Pontiac FULL size BIG BLOCK cars and WAgons. The Buick 9.3 rear was dropped totally in 1971 and the PONTIAC 10 bolt cover 12 bolt ring gear was the intermediate heavy duty rear and the 8.5 was the new base rear for most all CARS...full size and A-body.
Hope this info helps some. I know it is confusing and that is why I am trying to help. Take care, Jim
J D
#8
Just an Olds Guy
Join Date: Jul 2008
Location: Edmonton, AB. And "I am Can 'eh' jun - eh"
Posts: 24,525
I have a 12bolt cover on my car. I havent checked into it more than counting the bolts. I figured I would get to it when I was at that point, but I am now curious - what would a desirable rear end be out of the olds options? I dont know alot about this so if the question is naive i apologize.
Also, 12 bolt doesn't mean the number of bolts on the cover, it refers to the number of bolts that hold the ring gear to the carrier.
If you really want to do something for your car hook up with Brian or Jim (507 or Monzaz). Both of them are experts on rear ends and know their stuff. I've bought from Jim and am very happy with the posi he sold me. Mine now has 3:23 gears. Originally it was going to have 3:42's but that was before my 455 project cratered.
#9
12 bolt full size
ditto I double that. I am answering the OP the first one full size car. Just to double confirm that ...If the other guy wants to start a post please do as it will get too confusing to discuss the B-body and a-body OLDS 12 bolts...lol.
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