75 Monza V8 rear - were they all 7.5?

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75 Monza V8 rear - were they all 7.5?

Postby Wheezercowboy » Sat Aug 21, 2021 5:22 pm

Looking at an original 75 V8 Monza that’s a cheap rusted heap tomorrow. Figured I would try to strip it for my 76 Vega build (mounts, oil pan, exhaust manifolds, etc.). I’ll try to confirm the axle code but wondering if all V8 Monzas would have had the 7.5 rear?
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Re: 75 Monza V8 rear - were they all 7.5?

Postby 283vega » Sat Aug 21, 2021 8:08 pm

I think all v8s would be 7.5s but you can verify by how the swing arm bolts on. THe 7.5 has 2 long through bolts ,the 6.5 has 4 large screws.
283 vega
70 corvette


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Re: 75 Monza V8 rear - were they all 7.5?

Postby Wheezercowboy » Tue Dec 07, 2021 11:18 am

Just an update. No 75 Monzas had the 7.5", even the 262s. The long bolt vs short bolt identifier is not correct. Original 75 2+2 had the EB code rear (6.5").
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Re: 75 Monza V8 rear - were they all 7.5?

Postby gregh » Tue Dec 07, 2021 4:39 pm

Nope.
I have a 75 2 + 2 built in Quebec November 1974 and it has a 7.5" diff. The original differential was 256 open rear end that I swapped in a set of S10 axles but then I lucked out and found a 308 posi in the local wreckers and swapped in the whole diff this spring.
Both diffs are absolutely 7.5", I confirm that with the part number on the gear sets.
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Re: 75 Monza V8 rear - were they all 7.5?

Postby sirrick4 » Tue Dec 07, 2021 5:17 pm

My 75 Monza has the 7.5 rear as well.
Rick ......1975 Monza 2+2
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Re: 75 Monza V8 rear - were they all 7.5?

Postby cjbiagi » Wed Dec 08, 2021 9:40 am

75's had the new 7.5" rearend. My 75 which was ordered in Sept of 74 has one.
Clyde.........75 Monza 2+2
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1975 Chevrolet Monza


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