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Old 03-20-2022, 11:02 PM
Mark2002 Mark2002 is offline
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Default 1969 L78 4:56 gear

Hello, new member here, I've been reading the forum for a while and just joined.
I have a 1969 Chevelle L78 4 speed originally Butternut yellow. Black top, black interior.
My build sheet has a KM code which matches the stamp on the rear for a 4.56 gear. All the sources I can find on the web point to only one 1969 Chevelle ordered with this rear end ratio. Does anyone else out there have a documented factory 4.56 rear in their car?
Thanks

Last edited by Mark2002; 03-21-2022 at 01:05 PM.
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  #2  
Old 03-20-2022, 11:17 PM
TimG TimG is offline
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Wow, I’m no Chevelle expert, but I’m anxious to hear about this question.
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Old 03-20-2022, 11:34 PM
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'

There was a Black '69 Hardtop factory 4:56 car we looked a here a few years back.
Factory 4:56 is special as some info indicates Copo 9511 was necessary for '69 model cars.
Looking forward to seeing/hearing more about your car, welcome aboard!

~ Pete

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Old 03-20-2022, 11:41 PM
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Jerry B. Garnet Red '69 L-78 Chevelle has a factory 4.56 rear....not a COPO.
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Old 03-21-2022, 12:51 AM
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Default Jerry B.

Yep and Jerry has the build sheet on his car.
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Old 03-21-2022, 03:05 AM
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Quote:
Originally Posted by Mark2002 View Post
Hello, new member here, I've been reading the forum for a while and just joined.
I have a 1969 Chevelle L78 4 speed originally Butternut yellow. Black top, black interior.
My build sheet has a KM code which matches the stamp on the rear for a 4.56 gear. All the sources I can find on the web point to only one 1969 Chevelle ordered with this rear end ratio. Does anyone else out there have a documented factory 4:56 rear in their car?
Thanks
Which transmission does this beast have?
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Old 03-21-2022, 12:45 PM
Mark2002 Mark2002 is offline
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The build sheet has a XF code crossed out and XD written in. Seems strange that they would replace an M21 with another M21 code. A friend suggested to me that perhaps it was meant to be replaced with a M22. The transmission is in the car, so I haven't been able to verify the shaft or the angle on the gearing to confirm it as an M21 or M22.
I have not driven it yet which would make it much easier to tell which trans.
Unfortunately, it no longer has the original motor. The sheet metal appears to be all original and in great shape. Surprisingly for a NJ car, it has original quarters rockers and fenders. Floors and trunk are also very good. I'll post some pictures soon.
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Old 03-21-2022, 03:02 PM
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Welcome to this site and I'll look forward to seeing pictures and hearing more about your L78.
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Old 03-21-2022, 04:38 PM
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Welcome Mark and DO TELL! Lots of pictures too!
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Old 03-23-2022, 03:10 AM
enio45 enio45 is offline
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Sammy and his pictures :-)
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