Correct rear axle for 1970 Camaro L78

[JHS]

I am trying to confirm what rear axle ratios could be ordered with the 70 L78. I have been told that one had two gear options and both had to be posi units: a 3.55 (COX code) which was std. and a 4.10. The only 4.10 units I can find in Colvin's book are COO and CRE codes and neither being posi units. Would a COO unit be correct for my car and should it be a posi unit?

[Mr70]

The 4:10 units are all posi,and redundant to list them as such so Colvin doesn't.
I agree with your gearing,and think the COO 4:10 posi is correct for your L-78 application.
I think the CRE 4:10 posi is the LT-1 360HP application.

[DarrenX33]

Check out NastyZ28... (http://www.nastyz28.com/index.php?page=1970camaro)

[Jeff H]

The COO would be correct for the 4.10 posi. My L78 came with the 3.55 posi originally but right now it has a COS housing with the original 3.55 posi setup in it. So I'm also trying to locate an origina COX rear but I need one dated 3rd week of Jan 70 or earlier which will be real tough to find. Someone on the 2nd gen board listed above had a COX rear and I think he told me it was a March rear. I'll forward his contact information when I get home from work.

[JHS]

Thanks guys for your input. Colvin had me confused as he denotes some units as posi so was not sure if that meant that the 4.10's were non-posi since they were not denoted as such.

[JHS]

Thanks Jeff for your help with the COX housing, will look forward to getting the contact info. and can be emailed at [email protected]

Joe

[COPO]

My Z-28 and L-78 both have COO 4.10 posi rears. I've never seen a car with a CRE rear.

[70-SS/RS-L78]

The COX 3:55 POSI is the Standard rear for the L78, The COO 4:10 POSI was optional rear.Colvin's book is a little confusing as it does not list the COO as a Locking rear. http://www.yenko.net/ubbthreads/images/graemlins/dunno.gif
How is the restoration going Joe?

[JHS]

Mark,
How are you? The resto is starting to pick up speed as I am completing the L78 Nova and just bought a really nice, highly documented and matching #'s LS5 El Camino. I would like to take this opportunity to thank you for all your help with my camaro, I know my questions drive you crazy.

[CamarosRus]

FYI, The 70 L-78 owners at nastyz28.com are TRYING to put together a registry of ALL known 70 Camaro L-78's. With only 600 having been originally built, WE are very much interested in gathering any and all info on how many remain with and w/o original powertrain.
Please communicate your info to Mike Steitz about ANY 70 L-78 Camaro or owner you know of, at this link

http://www.nastyz28.com/forum/showthread.php?t=36677

[JHS]

Will register the car ASAP