CRG Discussion Forum

Camaro Research Group Discussion => General Discussion => Topic started by: 77thor on January 21, 2018, 07:09:06 PM

Title: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: 77thor on January 21, 2018, 07:09:06 PM
I've been trying to figure out the possible engine/trans combos that my 69 may have been built with...
the car has the original rearend (Axle code: BR 1206G1, Line2: E, Casting: 3894860NF) Read: 12-Bolt Posi 3.07
But the engine/trans are non-original.
And I know it is was originally a manual transmission car(clutch/brake pedals).

So, assuming the 3.07 gear ratio was standard and not an option...
What engine/trans combos would have been possible?

Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: Spooky on January 21, 2018, 11:20:35 PM
Where does the speedo cable come out of the firewall? If it comes out under the fuse box area it is a lower performance model like a 307/200hp Higher performance model muncies, come out to the side of the throttle lever (Left side looking at the firewall, right side of the car)
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: 68 Ragtop on January 22, 2018, 06:20:41 PM
I've been trying to figure out the possible engine/trans combos that my 69 may have been built with...
the car has the original rearend (Axle code: BR 1206G1, Line2: E, Casting: 3894860NF) Read: 12-Bolt Posi 3.07
But the engine/trans are non-original.
And I know it is was originally a manual transmission car(clutch/brake pedals).

So, assuming the 3.07 gear ratio was standard and not an option...
What engine/trans combos would have been possible?



L35 (396/325) with 3 or 4 speed.
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: 77thor on January 22, 2018, 06:58:23 PM
Where does the speedo cable come out of the firewall? If it comes out under the fuse box area it is a lower performance model like a 307/200hp Higher performance model muncies, come out to the side of the throttle lever (Left side looking at the firewall, right side of the car)
It comes out to the side of the throttle lever.
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: 77thor on January 22, 2018, 07:01:27 PM
Quote
L35 (396/325) with 3 or 4 speed.
Curious... Where did you find that info?

Also, I don't think my Camaro would have had a BBC because of the heater core in/out location.
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: bertfam on January 22, 2018, 07:35:04 PM
If it's a small block heater box, the rear end is original and the Muncie hole is original, then the car started life as either an LM1 (if the car was built before January 1st, 1969) or an SS 350. However, the 3.07 ratio was the optional "Economy" ratio, not the "Standard" ratio on both engines. The standard ratio for the 1969 LM1 and L48 with the Muncie M20 was the 3.31 non-posi.

Ed
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: 77thor on January 22, 2018, 10:02:26 PM
OK, thanks.

Is there a list compiled that shows all the standard gear ratio's for each engine/trans combo??
I was looking for one but never found one.
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: bertfam on January 22, 2018, 10:11:42 PM
Quote
Is there a list compiled that shows all the standard gear ratio's for each engine/trans combo??

Yes, it's called the Camaro Power Teams chart and it's in most of the dealer literature. It's also in the Camaro Reference book by John Hooper.

Ed
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: 1969Z27 on January 22, 2018, 10:48:59 PM
Look on page 11.


https://gmheritagecenter.com/docs/gm-heritage-archive/vehicle-information-kits/Camaro/1969-Chevrolet-Camaro.pdf
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: KurtS on January 22, 2018, 11:39:56 PM
I have one generated. It needs proofed (it's complicated and it changes during the year) and I need to figure out how I'm posting it (*not* a html table).
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: 68 Ragtop on January 23, 2018, 01:46:08 PM
Quote
L35 (396/325) with 3 or 4 speed.
Curious... Where did you find that info?

Also, I don't think my Camaro would have had a BBC because of the heater core in/out location.


Every year had a different Power Team Chart that showed what engine, transmission, and other options like AC would come with as standard, performance, economy, or available as special order.

They are hard to find online, but almost all the old school pre internet fact/data books have them. I am surprised CRG does not have that information published, but sounds like they are working on it.

It was in some dealer sales brochures that you can find online. Here is a link to one:

https://myclassicgarage.com/marketplace/knowledge_base/1969-chevrolet-camaro#drivetrain
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: bcmiller on January 23, 2018, 04:55:15 PM
I have one generated. It needs proofed (it's complicated and it changes during the year) and I need to figure out how I'm posting it (*not* a html table).


How about as a pdf ?
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: KurtS on January 24, 2018, 06:35:10 AM
I know how to make pdf's. The issue is the data isn't easy to present completely.
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: ZLP955 on January 24, 2018, 11:25:40 AM
Look on page 11.
https://gmheritagecenter.com/docs/gm-heritage-archive/vehicle-information-kits/Camaro/1969-Chevrolet-Camaro.pdf
Interesting that document does refers to Z/28 here and there, but has nothing on the 302 in the drivetrain specs.
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: 69Z28-RS on January 24, 2018, 02:29:45 PM
I noticed that also.  My suspicion is that it wasn't listed in the 'engine options', because the 302 was not an engine option; instead it was *part* of the Z28 performance option (including many other parts and requirements beyond the engine).
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: JKZ27 on January 25, 2018, 02:42:51 AM
No mention of the 307 or L78 either, among others.
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: william on January 25, 2018, 06:47:09 PM
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.
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: starcruser on January 25, 2018, 08:32:04 PM
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.
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: william on January 26, 2018, 01:58:48 PM
At one point, std ratio for an L48/TH350.
Title: Re: Q? 12-bolt 3.07 rearend came with what engine/trans combo
Post by: rare396bronze on January 28, 2018, 06:16:25 PM
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.