KQ rear with 4.56 gears
 

I found a KQ rear that has the COPO 4.56 gears in it.
Were any COPO/Yenko Chevelles ordered with 4.56's like the Camaros or would this has been switched by the dealer?
Thanks
Eric

Re: KQ rear with 4.56 gears
 

If the rearend came from the factory with 4.56-1 gears it would have a different two letter code to identify it. You could even tell if it was posi or non posi by the code. Each one was specific.

Re: KQ rear with 4.56 gears
 

Not to start an arguement but, I have seen original "BE" rears with 4.56's.
I have also seen "CBW" rears with 4.10's, and 4.56's
that were supposed to be orignal to the cars.
The gears matched the window stickers for the cars and the axle codes matched the POP's.

Has anyone heard of a COPO/Yenko Chevelle ordered with 4.56's

Re: KQ rear with 4.56 gears
 

I reckon that'd be the *ideal* gear set to have...https://www.yenko.net/ubbthreads/imag...ns/naughty.gif

Re: KQ rear with 4.56 gears
 

GM shows "KM" for 4.56 and "KO" for 4.88 12 bolt posi rearends. What am I missing? Always willing to learn.

Re: KQ rear with 4.56 gears
 

What does the white COPO out of TN have for a rear end code? It is a factory 4.56 car.

Re: KQ rear with 4.56 gears
 

Keith,
The "KM" is the standard duty 4.56 (3862515-3862527) rear just like the "KK" is for the standard duty 4.10.
This KQ rear has the correct 3916234 posi unit and the 3917973, HD 4.56 (3916230-3916231)special heat treat, gearset in it.

It is possible that someone ordered the correct COPO 4.56 gears and replaced the 3917971 4.10 gears, but how many people knew that GM had two different 4.56 gear sets back then.

Thanks,
Eric

Re: KQ rear with 4.56 gears
 

Our L78 car has the KK 4.10 rearend while the COPO has the KQ. Until people got into restoring these cars, very few knew the difference or even realized that there were two different rearends. The drag race crowd would be the first to realize that there was a difference. My feeling is that anything but 4.10 gears in a KQ rearend would have been swapped in at some point in the past. Could be wrong though. This is what makes this hobby interesting.

Re: KQ rear with 4.56 gears
 

I thought 4.10 was the lowest gear as factory installed on 69 COPO Cars and if you ordered 4.56s the parts came with the car for dealer installation. It was noted on the Window Sticker and POP with the "right" code, but not the rear axle tube. https://www.yenko.net/ubbthreads/imag...lins/dunno.gif

Re: KQ rear with 4.56 gears
 

My 69 L78 Nova was ordered with (possibly copo'd from what people have told me) and still has it's original BW coded 4:56 12 bolt, car is an April 69 build

Re: KQ rear with 4.56 gears
 

Grats on the find! https://www.yenko.net/ubbthreads/imag...lins/beers.gif

I have been looking for a KQ rear (ahem ... Chuck https://www.yenko.net/ubbthreads/imag...ns/naughty.gif) send me a PM if your thinking of selling

Thanks -

Jeff

Re: KQ rear with 4.56 gears
 

Ummm... me too https://www.yenko.net/ubbthreads/imag...-I-Have-It.gif

I've got a KQ rear that's dated 02 25 which is far too early for my Chevells's 07D build date. I'm prepared to swap or sell my KQ once I can find a better dated KQ rearend for my car. Anyone got a late 69 KQ rearend to sell or trade?

Re: KQ rear with 4.56 gears
 

Where, and in what did you see a 4.56 in a CBW that was original?

Re: KQ rear with 4.56 gears
 

Silver Duece in Middletown about 20 years ago.
It is still sitting in the same spot it was parked in 1973 when it threw a rod.

And no it is not for sale. The owner has told me repeatedly that someone can buy after he dies. And I am not in a hurry for that because he has been a great friend of mine for many years.

Re: KQ rear with 4.56 gears
 

Very interesting. Is there a special notation on the Yenko window sticker showing it? Or maybe on the invoice?

Re: KQ rear with 4.56 gears
 

"9511DT REAR AXLE 456 RATIO"

Re: KQ rear with 4.56 gears
 

Cool. In talking with Marlin there was rumored to be some with 4.56 gears, and one with 3.73s. Some things get confused, or assumed without proof. Sould this gentleman allow it, it would be great to see that option notation.