Type O 3.42:1 Ring and Pinion Wanted
November 30th, 2016 | 11:40 AM
#1
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Joined: Dec 2011
Posts: 38
Type O 3.42:1 Ring and Pinion Wanted
I am looking for a good used set of Type O 3.42:1 Ring and Pinion gears, 28 (or is it 27?; unable to clarify) spline which I will be installing in the 2.73:1 - 3.23:1 carrier. If anyone has a set please let me know. Thanks.
November 30th, 2016 | 11:47 AM
#2
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Joined: May 2011
Posts: 3,688
From: Delta BC Canada
fyi
Won't work without a spacer for OEM gear set. 3.42s were never meant to be installed on the 3.08-3.23 carrier.
You need the Richmond aftermarket 3.42 gears to achieve your goal.
Do you know if you have a 3.08-3.23 carrier or a 2.56-2.78 carrier? Are you sure you even have a 68-70 Type O? Your original post of 2.73-3.23 concerns me.
Good luck with your search
Last edited by oldsmobiledave; November 30th, 2016 at 11:50 AM.
November 30th, 2016 | 08:25 PM
#3
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Posts: 38
Thanks For The Information
There is no 2.73-3.23 carrier. It is 3.08-3.23 (perhaps a typo on your part?).
Won't work without a spacer for OEM gear set. 3.42s were never meant to be installed on the 3.08-3.23 carrier.
You need the Richmond aftermarket 3.42 gears to achieve your
Do you know if you have a 3.08-3.23 carrier or a 2.56-2.78 carrier? Are you sure you even have a 68-70 Type O? Your original post of 2.73-3.23 concerns me.
Good luck with your search
Won't work without a spacer for OEM gear set. 3.42s were never meant to be installed on the 3.08-3.23 carrier.
You need the Richmond aftermarket 3.42 gears to achieve your
Do you know if you have a 3.08-3.23 carrier or a 2.56-2.78 carrier? Are you sure you even have a 68-70 Type O? Your original post of 2.73-3.23 concerns me.
Good luck with your search
FYSA, Yukon also produces the 3.42 and 3.90 for Type O as well but they run about $150.00 more than Richmond.
Thanks for the help. Much appreciated.
December 1st, 2016 | 08:38 AM
#4
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Joined: Oct 2013
Posts: 104
From: Long Island
hello fellows,
Not to hijack the post but have a similar question.
I have a 68 cutlass with a 12 bolt housing and 10 bolt open differential. Who sells a posi diff hat I could just simply swap in? Not to knowledgeable about rears.
Rich
Not to hijack the post but have a similar question.
I have a 68 cutlass with a 12 bolt housing and 10 bolt open differential. Who sells a posi diff hat I could just simply swap in? Not to knowledgeable about rears.
Rich
December 1st, 2016 | 10:19 AM
#5
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Joined: Jan 2016
Posts: 49
supercarsunlimited.com got a set in june oem spec #46-148carrier $ 629. 46-036 3.42 ring&pinion 349.95 inst kit ie bearings shims chrush sleave ect worked well took 4hrs to install and set up I replaced axle bearins and seals it the same time mine is 68 442 type o had 2.23more snap off the line. they were great to work with rog
December 1st, 2016 | 12:42 PM
#6
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Joined: May 2013
Posts: 277
From: Alsip, Il
Monzaz is the member here you should talk to for a posi swap. I personally went the slow/expensive route and found a whole tm coded 3.42 posi rear.
December 1st, 2016 | 05:50 PM
#7
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Joined: May 2011
Posts: 3,688
From: Delta BC Canada
your 68 gears
supercarsunlimited.com got a set in june oem spec #46-148carrier $ 629. 46-036 3.42 ring&pinion 349.95 inst kit ie bearings shims chrush sleave ect worked well took 4hrs to install and set up I replaced axle bearins and seals it the same time mine is 68 442 type o had 2.23more snap off the line. they were great to work with rog
December 2nd, 2016 | 06:02 AM
#8
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Posts: 38
Richmond Is Way To Go
Rich
Sounds like Rog is the go-to guy on differentials. I'm going to go with the Richmond 3.42:1 gears as it is the easiest COA as there is no carrier change. My car was originally ordered as walk-in-and-buy-a-'68 442-dealer stock when new (equipped as a base automatic model with PS and PB as primary options) with the 3.08:1 axle. I swapped the OE SSI 14" x 6' wheels for the Wheel Vintiques reproduction SSI 15" x 7" with P22560R15 rubber. The 3.08:1 functions more like a higher 2.98:1 (no such thing in GM of course) ratio due to the larger rolling stock necessitating the change to the lower ratio for improved street performance and drivability.
If you have the Cutlass S with a 350 your axle should be the Type BOP 8.25" ring gear if it's original. The big-block 400/455 A-Bodies (442 and H/O) were equipped with the Type O. Your new replacement posi unit and gears should be far less costly as that axle went into three A-Bodies and I believe even some of the full size models in Buick, Oldsmobile, and Pontiac. Both Eaton and Auburn produce posi units for your axle and though not cheap they are less costly than Type O units. You get a small break by having the more common axle thus parts are less costly for those guys to produce due to higher volume sales. Capitalism economics at work.
Sounds like Rog is the go-to guy on differentials. I'm going to go with the Richmond 3.42:1 gears as it is the easiest COA as there is no carrier change. My car was originally ordered as walk-in-and-buy-a-'68 442-dealer stock when new (equipped as a base automatic model with PS and PB as primary options) with the 3.08:1 axle. I swapped the OE SSI 14" x 6' wheels for the Wheel Vintiques reproduction SSI 15" x 7" with P22560R15 rubber. The 3.08:1 functions more like a higher 2.98:1 (no such thing in GM of course) ratio due to the larger rolling stock necessitating the change to the lower ratio for improved street performance and drivability.
If you have the Cutlass S with a 350 your axle should be the Type BOP 8.25" ring gear if it's original. The big-block 400/455 A-Bodies (442 and H/O) were equipped with the Type O. Your new replacement posi unit and gears should be far less costly as that axle went into three A-Bodies and I believe even some of the full size models in Buick, Oldsmobile, and Pontiac. Both Eaton and Auburn produce posi units for your axle and though not cheap they are less costly than Type O units. You get a small break by having the more common axle thus parts are less costly for those guys to produce due to higher volume sales. Capitalism economics at work.
December 2nd, 2016 | 06:42 AM
#9
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Joined: May 2011
Posts: 3,688
From: Delta BC Canada
Rich
Sounds like Rog is the go-to guy on differentials. I'm going to go with the Richmond 3.42:1 gears as it is the easiest COA as there is no carrier change. My car was originally ordered as walk-in-and-buy-a-'68 442-dealer stock when new (equipped as a base automatic model with PS and PB as primary options) with the 3.08:1 axle. I swapped the OE SSI 14" x 6' wheels for the Wheel Vintiques reproduction SSI 15" x 7" with P22560R15 rubber. The 3.08:1 functions more like a higher 2.98:1 (no such thing in GM of course) ratio due to the larger rolling stock necessitating the change to the lower ratio for improved street performance and drivability.
If you have the Cutlass S with a 350 your axle should be the Type BOP 8.25" ring gear if it's original. The big-block 400/455 A-Bodies (442 and H/O) were equipped with the Type O. Your new replacement posi unit and gears should be far less costly as that axle went into three A-Bodies and I believe even some of the full size models in Buick, Oldsmobile, and Pontiac. Both Eaton and Auburn produce posi units for your axle and though not cheap they are less costly than Type O units. You get a small break by having the more common axle thus parts are less costly for those guys to produce due to higher volume sales. Capitalism economics at work.
Sounds like Rog is the go-to guy on differentials. I'm going to go with the Richmond 3.42:1 gears as it is the easiest COA as there is no carrier change. My car was originally ordered as walk-in-and-buy-a-'68 442-dealer stock when new (equipped as a base automatic model with PS and PB as primary options) with the 3.08:1 axle. I swapped the OE SSI 14" x 6' wheels for the Wheel Vintiques reproduction SSI 15" x 7" with P22560R15 rubber. The 3.08:1 functions more like a higher 2.98:1 (no such thing in GM of course) ratio due to the larger rolling stock necessitating the change to the lower ratio for improved street performance and drivability.
If you have the Cutlass S with a 350 your axle should be the Type BOP 8.25" ring gear if it's original. The big-block 400/455 A-Bodies (442 and H/O) were equipped with the Type O. Your new replacement posi unit and gears should be far less costly as that axle went into three A-Bodies and I believe even some of the full size models in Buick, Oldsmobile, and Pontiac. Both Eaton and Auburn produce posi units for your axle and though not cheap they are less costly than Type O units. You get a small break by having the more common axle thus parts are less costly for those guys to produce due to higher volume sales. Capitalism economics at work.
December 2nd, 2016 | 06:51 AM
#10
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Joined: Dec 2011
Posts: 38
So only Buick and Pontiac shared the BOP in the A-Body models? The Cutlass line was all Type O for those four model years? Good to know and sort of bad news for the small block crowd for parts locating and cost-wise.
December 2nd, 2016 | 06:15 PM
#11
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Posts: 3,688
From: Delta BC Canada
December 2nd, 2016 | 06:48 PM
#12
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Posts: 38
Good Information
Roger...tracking all. You're a great information source. I can understand why GM wanted to consolidate their axles into a corporate design. Unfortunately, they went with the Chevy axle which (in my opinion) was OK (due to 8.75" ring gear) but not great due to the u-joint shaft clips instead of bolts. I really do believe the Type O is a better quality axle. Would have improved the billions of Chevys that were made back then. Just my 1.5-cents worth of input.
December 5th, 2016 | 11:28 AM
#13
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Joined: Oct 2013
Posts: 104
From: Long Island
Rich
Sounds like Rog is the go-to guy on differentials. I'm going to go with the Richmond 3.42:1 gears as it is the easiest COA as there is no carrier change. My car was originally ordered as walk-in-and-buy-a-'68 442-dealer stock when new (equipped as a base automatic model with PS and PB as primary options) with the 3.08:1 axle. I swapped the OE SSI 14" x 6' wheels for the Wheel Vintiques reproduction SSI 15" x 7" with P22560R15 rubber. The 3.08:1 functions more like a higher 2.98:1 (no such thing in GM of course) ratio due to the larger rolling stock necessitating the change to the lower ratio for improved street performance and drivability.
Thank you for your info - appreciate it -
If you have the Cutlass S with a 350 your axle should be the Type BOP 8.25" ring gear if it's original. The big-block 400/455 A-Bodies (442 and H/O) were equipped with the Type O. Your new replacement posi unit and gears should be far less costly as that axle went into three A-Bodies and I believe even some of the full size models in Buick, Oldsmobile, and Pontiac. Both Eaton and Auburn produce posi units for your axle and though not cheap they are less costly than Type O units. You get a small break by having the more common axle thus parts are less costly for those guys to produce due to higher volume sales. Capitalism economics at work.
Sounds like Rog is the go-to guy on differentials. I'm going to go with the Richmond 3.42:1 gears as it is the easiest COA as there is no carrier change. My car was originally ordered as walk-in-and-buy-a-'68 442-dealer stock when new (equipped as a base automatic model with PS and PB as primary options) with the 3.08:1 axle. I swapped the OE SSI 14" x 6' wheels for the Wheel Vintiques reproduction SSI 15" x 7" with P22560R15 rubber. The 3.08:1 functions more like a higher 2.98:1 (no such thing in GM of course) ratio due to the larger rolling stock necessitating the change to the lower ratio for improved street performance and drivability.
Thank you for your info - appreciate it -
If you have the Cutlass S with a 350 your axle should be the Type BOP 8.25" ring gear if it's original. The big-block 400/455 A-Bodies (442 and H/O) were equipped with the Type O. Your new replacement posi unit and gears should be far less costly as that axle went into three A-Bodies and I believe even some of the full size models in Buick, Oldsmobile, and Pontiac. Both Eaton and Auburn produce posi units for your axle and though not cheap they are less costly than Type O units. You get a small break by having the more common axle thus parts are less costly for those guys to produce due to higher volume sales. Capitalism economics at work.
December 5th, 2016 | 11:32 AM
#14
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Joined: Oct 2013
Posts: 104
From: Long Island
spoke to Monzaz- great guy - he said - 12 bolts on housing 10 bolts inside - could only be one carrier- forgot which he said - but after the holidays ill be in touch with him and let you know tha outcome - appreciate all the responses and help.
December 5th, 2016 | 12:29 PM
#15
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Joined: Feb 2013
Posts: 14,849
From: Phoenix, AZ
As for factory units, there were four different posi carriers for the O-Type rear: three different carriers depending upon the gear ratio and another carrier for the heavy duty 31 spline rear.
#673 = 2.56 & 2.78 ratios, 28 spline
#671 = 3.08 & 3.23 ratios, 28 spline
#588 = 3.42 & anything numerically higher, 28 spline
#672 = 3.42 & anything numerically higher, 31 spline
***The 31 spline axles were offered in late 67-68 OAI cars only.
December 5th, 2016 | 03:40 PM
#16
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Joined: Jul 2006
Posts: 178
Monzaz built a drum to drum rear for my 76 Cutlass about 8 years ago and I am Totally satisfied with it! He even sent me progress pics while he was building it. And break-in instructions. I strongly recommend him. A real nice guy too. Straight shooter.
Tom
Tom
Last edited by Pfiffle; December 5th, 2016 at 04:07 PM.
December 6th, 2016 | 06:24 AM
#17
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Joined: Oct 2013
Posts: 104
From: Long Island
the sport needs more guys like that!
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