Author Topic: B O P Axle article  (Read 3041 times)

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Offline Weldar

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B O P Axle article
« on: December 16, 2012, 09:17:15 PM »
Some interesting information.

Dwaine
65 Skylark GS HT Auto - Under restoration
65 Skylark GS HT 4sp - Driver
2 x 65 Skylarks for parts

"If you stay ready, you don't have to get ready" - Les K.
"The closer to the wellhead the better" - Oilfield Oldtimer

Offline Brian

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Re: B O P Axle article
« Reply #1 on: December 17, 2012, 09:07:52 AM »
Thanks for posting the article.  I read this magazine too and saw it.  I was pleased to see the BOP axles get some print space.  I do feel compelled to point out one detail in that article that may mislead some people.  On the 3rd column of the 1st page, it lists the Buicks as having the BOP axle form 64-71.  In reality, Buick purchased all the A-body rears from Pontiac from 64-67.  Most of the 64-66 Buick cars I have worked on even  had "Pont" stamped on the upper rear control arms.    In 68, Buick designed their own rear that is very similar to the Pontiac rear, but very little interchanges--this is the rear that has different size bearings on each side of the carrier, has a larger big pinion bearing, and uses 7/16" bolts to hold the ring gear to the carrier (pontiac rear used 3/8" bolts).   
   I hope this helps keep down confusion amongst the Buick folks. 
'64 Skylark 2dr ht 4 speed, 300-4
'65 GS ht, 4 speed,2-4s,AC,PS,PB,PW,Pseat,Tilt
'66 Skylark 2dr ht 300-2 automatic
'78 Yamaha DT 400 2 stroke
'88 Ford F-150 4x4 (used to be 4x2)
'89 Ford F-350 4x4
'03 Honda Accord Coupe V6 6-speed manual (daily driver)

Offline WkillGS

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Re: B O P Axle article
« Reply #2 on: December 17, 2012, 11:36:20 PM »
   The early Pontiac rears do have differences from the Buick and Olds versions. As Mentioned in the article, Pontiac rears have an extra rib on the center section.
   I'm not convinced the width increased in 1966 as the article stated. My 65 GS rear is the same width as my 66 and a 67 rear. I've read Pontiac rears might be an inch wider.... Remember the Pontiac 'Wide Track' ad campaign?
I do have a narrower '64 Olds F-85 rear. It was a 3.08 posi and also had the smaller upper control arm bushings. '65-up bushings were a larger diameter.

Jim Monzaz has a very informative site here:
http://www.jdrace.com/diff_id/10bBOP_Early.htm
He's also a good source for parts and service. He's a Buick guy too :thumbsup:
« Last Edit: December 18, 2012, 12:03:47 AM by WkillGS »
Walt K
Eastern Pa

66 GS Astro Blue/blue 425 auto
66 GS Silver Mist/black 401 4 spd
66 GS Flame Red/black 401 5 spd
66 GS Saddle Mist/black 401 L76 auto
66 Special Flame Red/black 300 5 spd
65 GS vert Verde Green/ Saddle buckets 401 4 spd
79 Turbo Regal