69 Dart 4 door cruiser

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Kern Dog

Build your car to handle.
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Getting old changes your perspective.
In the days of our youth, most dudes would rather walk than to drive a 4 door car. 4 doors and station wagons were uncool family cars driven by moms and married dudes. NO single guy wanted them, they just were not our style.
That was how I felt and all my friends shared the sentiment. We all had Darts, Dusters, Camaros, Firebirds, Chevelle and pickup trucks….all of them were 2 door models.
As I approach 60, I am seeing that 4 door classics can also be cool but maybe for a different reason. Nowadays, just seeing any classic on the road is great.
Last year I did some trade work for a guy and he paid me with this:

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1969 Dodge Dart “Custom” 4 door. Of COURSE it is green.

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Of COURSE it has hubcaps. It was a slant six model but now has a 1973-76 spool type k member. I got it as you see it, a roller but expected to see 9” drum brakes. I planned on doing the usual….swap in an 11” front disc setup and an 8 1/4 from a 70s A body or an 8 3/4 from a 68-70 B body.
Am I lucky?
It already has the 11” front discs. The rear has 11” drums but also an 8 1/4” axle!

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I have a mild 360 planned for it along with an A-500. The .69 overdrive ratio will take a 3.23 to 2.22 and a 3.55 to 2.44. What gear ratio is this one?
I jacked up the right rear to get the tire off the ground so I could spin the tire to read the ratio stamped in the ring gear.

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The tire wouldn’t turn. Why?

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Really? A Sure Grip in an 8 1/4” axle? How rare is that? I raised the left side and was able to spin both tires. From there I found the stamps but they are hard to read. The thin ring gear meant no 3.23 or 3.55, the only gears I want to use.

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That sort of looks like a 2.71. That is a known ratio. I counted 46 teeth on the ring gear and 17 on the pinion. That comes up to….

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It always surprises me when I see such a tall ratio with a Sure Grip. I have a set of 3.21 gears from another 8 1/4 but I’d prefer a 3.55. Does anyone know if this case can accommodate a 3.55 gears? I remember that there are instances where certain carriers only work up to a certain ratio like a 2.45 and taller use one carrier, a 2.71 and lower use another, etc.
 
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I think you're right on which carrier accepts what. You know, unless you just want to do the A500 mods.....you could use an A998/999 and have the same low first gear set and it would bolt right in with no whacking on the tunnel or torsion bar crossmember. Kind of a poor man's OD. 3.55's would be my choice also if you really want to do the A500. That will be a neat car when you get it going. I believe I would rock it down the road with the patina it has!
 
I actually have both an A-999 and an A-500. I wanted to use the overdrive in this to make it a good all around cruiser. The floor pan mods don’t scare me. I can weld and grind!
Nothing is set in stone though. I often change my mind during a project.
 
I have an 8.25 sure grip with 3.55’s. I understand that the case is the same but you must change carriers between high and lower ratios…
 
A Sure Grip in an 8 1/4” axle? How rare is that?
Yeah,the 73-76 Dart Sport and Duster the Sure Grip was a option.
I have no problem with more door Mopars. Owned many and have one now.
Nice project you have there.
I think the 2.71 is ok carrier it's the 2.45 gear set that has the different carrier.
Don't quote me on it.Been along time from the last time dealing with a 8 1/4.
Oh yeah food for thought. Ma Mopar was dealing with a strike in the 73-74 years and parts were in short supply.The went into the parts bins and snatched up 11x2'' drums and shoes from the slow selling "C" body cars and used them on "A"body cars to keep production going.
 
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I know mid 2000's jeep liberty's had 8.25 rear ends and i believe most were geared in the 3.2x-3.7x range and many had limited slips. Maybe you can grab an entire carrier and pinion out of one of those and drop it in?
I love the 4 door cruiser and you have an amazing start to that project already
I'm in the process of restoring a 68 2 door post car shell (dream car) and will eventually swap all the guts over from the 4 door to the 2 door. But I'm enjoying the 4 door while I can
(360 - 727 - 7.25, bbp disks up front and sbp rear. Soon going to swap in 4 speed and bbp 8.75)

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I thought it might be an axle from an M body Police car but the leaf spring pads are still the A body 43" center to center. That 2.71 ratio kills it for me though. The build is meant to be a cruiser but I want it to snap out of the hole too. The overdrive transmissions sure let you have a wider range of driving fun like a newer car.

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I don't know if I'll ever tear it down to do the body and paint. Maybe I will but I'm not sure yet. The 360 planned for it is currently in this car:

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It is a standard bore 1970s era 360 with #308 heads, some Weiand 4 barrel intake and a MP 280/474 cam that actually runs quite well. The black Dart has 4.10 gears and really scrams for such a mild engine. It would neuter the engine to step way back to 2.71 gears.
I thought that the 8 1/4" axles had some design change in the mid 90s where everything before those years is one design and after that the components don't mix well with the older stuff.
 
I've never dealt with 8.25s before so I'm not sure about interchange of parts of years. I always thought there was a limit of carriers in the sense of 1 carrier for the higher range of gears, and another carrier for the lower range of gears and I dont know where the split would have been. All i know is that before I got the 8.75, i was on the verge of finding a good jeep liberty rear end to drop in my dart
 
I love that color and everything about that car even the 4 doors.

I have the 2 door version of that in the same color, they were so good lookin that year

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For me it was a 67 Dart 2 door hardtop. Of course it was green. That was in 1974.
Owned 3 67's over the years.
 
I don’t like the gray hair but the wife seems okay with it.
The other stuff still works.
 
Women tell me all the time how nice my gray hair is.
I tell 'um it's grey all over too !!
 
You was paid well in my book sir. Set up with disk breaks and 8 1/4 sure grip under a beuity of a Dart, like you I do enjoy seeing these more door cars and long tops, at 67 now I am glad I put a shur grip in my 8 1/4, now! hang on to your hat I have 2.97 or 2.92 behind my 360 build and it makes my 66 Plymouth Valiant Sedan feel like a 440 is under the hood, even put a sway bar under the front-end. At a stop light she squats and moves out, but when it gets to 16 hundred rpms I better have at lest a half a tank because it moves all the gas to the rear of the tank, by the time I hit 47 hundred she stall right out, no gas to the carb.
My 8 1/4 would not hold a 3.55 gear I had, but now that I drive here I am quite happy with cruising 65 at 18 hundred rpms.
I would be breaking u-joints if I had 4.10 or 3.55 gears if I got a good bite, but that's what 7 inch to 8 inch tires are for, they break loose.

Well, I will be watching, learning and enjoying this build. Took me 7 years.

But loosing 3 brothers every other year in those 7 years I did drag my feet.

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Losing family members is a hard punch to the gut. It hurts the soul. I’ve often wondered about what is worse…. Being the first to go or the last.
Sorry to veer so off topic but I’ll be back on target in a moment!
 
I thought it might be an axle from an M body Police car but the leaf spring pads are still the A body 43" center to center. That 2.71 ratio kills it for me though. The build is meant to be a cruiser but I want it to snap out of the hole too. The overdrive transmissions sure let you have a wider range of driving fun like a newer car.

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I don't know if I'll ever tear it down to do the body and paint. Maybe I will but I'm not sure yet. The 360 planned for it is currently in this car:

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It is a standard bore 1970s era 360 with #308 heads, some Weiand 4 barrel intake and a MP 280/474 cam that actually runs quite well. The black Dart has 4.10 gears and really scrams for such a mild engine. It would neuter the engine to step way back to 2.71 gears.
I thought that the 8 1/4" axles had some design change in the mid 90s where everything before those years is one design and after that the components don't mix well with the older stuff.
i like the black one.
 
The black car....
It really deserves to be treated better but I love the freedom of sliding around in the dirt with it, not worrying about scratches. It started out like this:

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