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#1
01-25-2026, 04:29 PM
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8.2 Nodular Diff Missing Bearing Caps
I acquired a basket case 1965 GTO Tri-Power car, that came with a Nodular case '67 3.55 posi diff that was all disassembled. I popped the cover off and discovered that the bearing caps are missing. Car was bought from the widow of the PO, and she has no clue about any of this.
How difficult would it be to install caps from a donor BOP diff and get it line bored? Maybe I should just junk it and get a QP 9 inch or build an 8.5 BOP, since it is not original to the car anyways? I'm an hour north of the WA/Canada border, and Pontiac parts are scarce up here. Cheers, Brian
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1965 GTO Coupe project in the works. PHS documented Mayfair Maize, Tri-Power, 4 Speed, 3.55 Posi |
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#2
01-25-2026, 05:02 PM
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I don’t know even where you would get the spec’s for the bore even if you found a shop with in a non crazy travel distance that could hone it.
I guess it’s done though because I think they offer steel caps for the Ford rears.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#3
01-25-2026, 05:46 PM
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Ya, I see they make billet caps for 9 inch and 12 bolts. Maybe I'll call Moser tomorrow and see what they have to say.
It is a pretty desirable rear end from what I gather. ZH code nodular 4 pinion for a 1967 GTO should have some value to the right guy, if I can salvage it.
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1965 GTO Coupe project in the works. PHS documented Mayfair Maize, Tri-Power, 4 Speed, 3.55 Posi |
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#4
01-25-2026, 10:08 PM
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I've used Strange billet aluminum caps on GM 8.5" and 12-bolt rears and they work great. Just need assembly, ID measurement and possible machining.
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1967 Firechicken, 499", Edl heads, 262/[email protected]" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. [email protected] mph with a 1.45 60'. Still WAY under the rollbar rule. |
| The Following User Says Thank You to AG For This Useful Post: | ||
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#5
01-26-2026, 01:40 AM
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I don’t see why line boring would necessarily be needed. I’d get some caps off a junk rear and install them with bearings and races see how they fit the rear should be inline with the axle bearings but I can tell you having launched stick cars hard for many years the rear ends can banana and still run really well. In fact stock eliminator cars set the rear up so under load they get straight which means the rest of the time they are bent. lol. So as long as the caps clamp the bearings and races properly that’s all you need to worry about
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Happiness is just a turbocharger away! 960 HP @ 11 psi, 9.70 at 146. Iron heads, iron stock 2 bolt block , stock crank, 9 years haven't even changed a spark plug! selling turbos and turbo related parts since 2005! |
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