Hi,

If Mark declines, I'm next in line, OK ?

Regards, Scott

I'm just wondering if they'll be a dud on takeoff compared to the 3.36's.

I'm on a 10.5" clutch as well. 

My original intention was to build a car that could actually cover some miles. The 67 with 3.55's is strictly around town.

Is it easy to setup a used set for pattern?

cdnpont wrote:

---

I'm kind of interested. Great value. I have a 12 bolt housing and would like to change it out into my 65 to get rid of the gimpy 3 arm 10 bolt setup.

But how would 3.08's work with a 327/M20 with 27" tall rear tires? The 10 bolt in there is 3.36, which might be optimal for this combo, although I've never seen 3.36 available new today for a 12 bolt. Just 3.42's.

---

 I ran my car for one summer with the 283/M20 3.31 combination and it was fine Mark.  I suspect the 327 torque would make up the difference between the 3.08 and 3.31 ratios. What I'm trying to say is, I bet the 327 would be as good or better with 3.08 vs. the 283 with 3.31's.

36.5" tire,

3.55,  70mph = 3235 .  60mph = 2773.  50mph = 2311

3.36, 70mph = 3062.  60mph = 2625. 50mph = 2187

3.08, 70mph = 2807.  60mph = 2343. 50mph = 2006

3.08's would be 2600 at 65 which is probably the minimum highway speed you'd need to not get run over down here. Not too bad for travel. One can see the issue with 3.55's.

I've bought Barry's gearset. And sorry for stringing this out so long Greg.

Now I have a winter project!

cdnpont wrote:

---

36.5" tire,

3.55,  70mph = 3235 .  60mph = 2773.  50mph = 2311

3.36, 70mph = 3062.  60mph = 2625. 50mph = 2187

3.08, 70mph = 2807.  60mph = 2343. 50mph = 2006

3.08's would be 2600 at 65 which is probably the minimum highway speed you'd need to not get run over down here. Not too bad for travel. One can see the issue with 3.55's.

I've bought Barry's gearset. And sorry for stringing this out so long Greg.

Now I have a winter project!

 

---

 I'm thinking you mean a 26.5" tire Mark  

That would be a heck of a way to bring down the RPM though...

To get an idea as to the difference between the 3.08 and 3.36, that is a similar rpm drop between the two of them that a lock up torque converter on a TH350 makes. In this case 181 rpm and I think a lockup is typically in the 250-300 rpm range.

cdnpont wrote:

---

A question I should ask is will this carrier fit in my passenger car 12 bolt housing?

I assume they are the same, with the difference being the series?

---

Are you referring to the carrier in Barry's ad?   Barry hasn't provided the casting #, but if it's from a passenger car diff it should work.

seventy2plus2 wrote:

---

I wouldn't go any higher (numerically lower) than my 3.07's. I've got the torque to get it rolling, but they're a decent compromise as I'd hate to see what I'd be revving with 3.36's.

---

I am thinking about installing a mild 402 BB/4 speed in my 68 Bel Air. I have the choice of Muncie M20 or M21; or a BW T10. I also have a choice of posi rear axle ratios: 3.07; 3.36; or 3.73. 

Wondering what you guys think might be the best trans and diff ratio combo for comfortable drive-ability and strong performance.

carrier 1968 camaro 12 bolt

I find this sort of topic fascinating and it is always a pleasure to learn automotive tid bits. Thanks for sharing everyone. 

How fast do you guys drive these things? I see 80 and some times up to 110 regularly and pretty quick in my 67, but I just kiss that number, then thats it, and back down she goes.

I figure 50 -70 is where most of the continuous running happens, with 55 probably being the comfortable sweet spot on the backroads around here.