1969 Nova L78 M22 4.88 on Lost Muscle Cars

[JoeC]

The window sticker shows the COPO number 9511CA

There is a RPO HF8 listed for 4:88 gear ratio but I don't know if that was used in 1969

[Bill Pritchard]

Hard to read the window sticker clearly, but I think I see '9511' followed by two letters on the left side of the line where it lists the axle ratio. Too bad there was no picture of the Trim Tag, but no one paid any attention to those back in the day.

[Mr.Nickey Nova]

I believe the 3.55 gears were standard for the L78 Novas. Anything lower, like 4.56 or 4.88 you could order.

[Mr.Nickey Nova]

Chevy By The Numbers shows rear axle code for Novas with 4.88 posi as BX.

[69hurstSC]

Are there any other documented L78 '69 Novas with 4.88s?

[Salvatore]

I know a few guys that begged Chevy to let them order something lower than 3.55's but to no avail. I don't think I remember seeing any 69 nova with even 4.10's let alone 56's or 88's. Dealer installed maybe?

[JRSully]

I had a 69 L78 Nova with a BW (4:56) rear in it. No paper to document, but the cast date (D 11 9)and build date (04 18) were perfectly matched to the TT and original engine cast/build date.

[luzl78]

slicks and those front wheels are off the ground

[JoeC]

I believe some of the Yenko 427 Nova's were ordered with the 4:10 gears using the COPO number 9511 like the car in this thread but have not found paperwork or a POP from one of the cars.

[jeffschevelle]

The two letters after 9511 are the ECL code and would be specific to each model of car, and what "standard" axle ratio was getting replaced. Each ECL points to a different component parts sheet, which lists what parts "go away" (the standard axle, the standard speedo driven gear, and possibly the transmission if a different internal speedo drive gear was necessary for the 4.88), and what parts get added to replace those items (plus a speedo reducer if they used one for that combo).

Camaros, Chevelles and Novas would each have different axle part numbers, so would require a different ECL suffix code for each car. And if COPO 9511 covered both 4.56 and 4.88 (and 4.10 for cars that had no 4.10 RPO available), then there would be a different sub-code (the second letter) for each of those ratios.

Anyone have any Camaro or Chevelle window sticker examples with 9511?? on them?