Q? 12-bolt 3.07 rearend came with what engine/trans combo

[JKZ27]

No mention of the 307 or L78 either, among others.

[william]

There is a chart that lists all RPO engines. It was part of the dealer ordering info. As Kurt and Bryon have noted it changed throughout the model year making 'a' chart complicated.

To answer the original question, a 3.07 posi was the standard ratio with a few engine/trans combos. It was optional on many others including the Z/28. By itself, not an indicator of the original engine.

[starcruser]

I have a 69 Camaro with 3.07 12 bolt same as yours. My car is original and it is a X11 SS-350. The engine code is HB.

[william]

At one point, std ratio for an L48/TH350.

[rare396bronze]

My 68 396/325 HP 4speed came from factory with 307 gear. Changed ring and pinion to 3.55 ratio but kept 3.07 gear in case i wanted to go back.