My twelve bolt has unusual perches on it, they are semi circular on either end and about 5 inches long on the sides with what looks like mounting or line up holes approx the size of a quarter in the middle, for leaf springs. I saw a simular rear end on the Year One 69 pro touring car, can any one shead any light on this situation? Mono leaf/multi leaf etc?

Thanks

do they look like this?
http://www.jegs.com/photos/312P4120074.jpg
if so, that is what a "normal" spring perch looks like. GM was the only company to use any other style on passenger cars. it is pretty common for someone to put these on when swapping a rear from a different application- it's what i used to put an 8.5 that was from a 73 Nova with multi leafs into my 71 with monoleafs.

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1971 Nova(looks like 69 camaro from underneath!)
355sb, vortec heads, HOT cam,T-10 tranny, 3.70 gears 16X8" IROC wheels. 12" Corvette brakes on the way.
see pics here http://community.webshots.com/user/novaderrik

Stock GM pads look the the ones at the bottom of the page in this link: http://www.tomsdifferentials.com/cat111.htm

The pads shown above are actually Ford/DANA type.

Tom

Novaderrick

That is exactly the ones, but I do not see evidence of a perch being removed and the welds look "virgin". Thanks for the answer, are these correct for my application? or are they from another car like a Nova, etc.,

Jim

they aren't "correct", but they are functional, and i prefer them. they leave all your options open as far as leaf spring thickness is concerned.

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1971 Nova(looks like 69 camaro from underneath!)
355sb, vortec heads, HOT cam,T-10 tranny, 3.70 gears 16X8" IROC wheels. 12" Corvette brakes on the way.
see pics here http://community.webshots.com/user/novaderrik

Aren't the perches in different locations between a Nova and a Camaro?

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69 convertible
LT1 4L60E

Yeah, they are impossible to collapse and I prefer them also.