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Old 12-05-2003, 11:32 AM
killerformula's Avatar Moderator
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Lightbulb Interchange question!

Hey experts,

I've done some searches on this site and haven't found the info I needed yet, so I figured I'd drop a quick line and see if I can get some info.

Kind-of a two part question: First I have a 273 10-bolt posi in my formula (yeah, I know, don't laugh...) and I'm pretty sure its an 8.5. I am pretty sure the carrier will support the higher gears (its 2.56 and lower for one and 273 or higher for the other right?) so what would be required to put some steeper gears in there? Just the ring and pinion right? And what would one expect to pay to have that done, ya know, reasonably priced work.

Second, I was thinking I might just swap to a 12 bolt, but I have no idea how to find out which 12-bolts will work for my chassis. The car is a 77 bird, how do I know which ones will swap in?



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Old 12-05-2003, 11:53 AM
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My friend was quoted 350 for change of the ring & pinion. That's including the gears. I don't know how good that price is since it's the first quote I've heard.
As for the 12 bolt, if you're not going to be building a high HP motor, it's not neccessary. The 10 bolt can handle some pretty good numbers, just nothing too big. I blew two trannys in my camaro with a 454 and the 10 bolt never let go.
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Old 12-07-2003, 10:03 AM
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There are books out there that explain the GM swaps in detail for you or you might ask here: these guys might know of a Pontiac site for you too.


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