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Would a 12 bolt (with 373) out of a 1973 Monte Carlo be a direct bolt in for a 1977 El camino?

Thanks for the help
Danny
 

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I vote yes.
73-77 Chevelle, Monte, and El Camino used the same rear, as well as 77-90 Caprice and Impala. There are minor differences in mounting holes and bolts. The later ones use metric bolts, but I don't think that happened until around 79.
 

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I my be all wrong but I don't think 73-77 Chevelles/elkys/montes even had 12 bolt rears. I say that because I had a 75 SS454 Elcamino that had a 10 bolt.

Someone may have adapted the 12 bolt to it but it was not a direct bolt in, if i'm correct in that 12 bolts weren't in 73-77s
 

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I my be all wrong but I don't think 73-77 Chevelles/elkys/montes even had 12 bolt rears. I say that because I had a 75 SS454 Elcamino that had a 10 bolt.

Someone may have adapted the 12 bolt to it but it was not a direct bolt in, if i'm correct in that 12 bolts weren't in 73-77s
I agree

Pre 1973 rears do not bolt into 1973 and later cars without mods. The 12 bolt that many have come to know and love was not installed in any assembly line cars after 1972.

I have never heard of a 3.73 factory rear in a 1973 or later Monte Carlo regardless of what type rear was in it. By 1973 the cars were more or less ruined by the oil embargo and lower compression engines. 2.73 and 2.54 were more the order of the day in terms of factory rear end ratios by 1973. Further I doubt that 3.73 gears were ever an option with a Monte Carlo. OVer 25 years have passed and I am certain that someone makes a 3.73 Ring and Pinion that fits the the post 1972 Monte Carlo rear. If the rear in question has a 3.73 it almost has to be an aftermarket set up. As far as a factory 3.73 I would say the chances are slim and none.
 

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Yep, I just went looking for 73 year model 12 bolt parts and there are none.

Sometimes it all comes back to me in spite of "oldtimers" disease.!!!
 
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