Brake line: 8.75 vs 8.25

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Woodsman341

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I have a '75 Dart Sport with an 8.75 rear. The previous owner completely removed the lines on the rear end, as well as all the interior drum components. The brass T is still there, as well as the lines coming from the front, they just plugged the T with two brass bolts/plugs .

Now, I found a complete brake setup on Inline Tubes, but the axle lines are for an 8.25. I contacted their support and was told they think the 8.25 and 8.75 rear end brake lines are the same. Before I purchase, can anyone confirm that?

Thanks!
 
Slow down, fella.
First off, if you've actually got an 8.75 in a '75 Dart Sport, it ain't factory. They had 8.25s.
So if you've got an 8.75, you've got to figure out which years it came from, pre '70 or post '70.
Why? Because they moved the vent and brake tee in '70. This affects the length of your brake lines. That means two different kits, and if either one is the same as that for an 8.25, who knows.
If your vent/tee is on the axle tube, it's the earlier version. If it's on the base of the center housing, it's the late version. Order the appropriate year lines for your rear end, NOT for the year of your car- that's why they're trying to sell you lines for an 8.25 rear.
Either order the right lines or bend 'em up and flare them yourself, it's not that hard.
 
Professor Fate said:
Slow down, fella.
First off, if you've actually got an 8.75 in a '75 Dart Sport, it ain't factory. They had 8.25s.
So if you've got an 8.75, you've got to figure out which years it came from, pre '70 or post '70.
Why? Because they moved the vent and brake tee in '70. This affects the length of your brake lines. That means two different kits, and if either one is the same as that for an 8.25, who knows.
If your vent/tee is on the axle tube, it's the earlier version. If it's on the base of the center housing, it's the late version. Order the appropriate year lines for your rear end, NOT for the year of your car- that's why they're trying to sell you lines for an 8.25 rear.
Either order the right lines or bend 'em up and flare them yourself, it's not that hard.
Click to expand...

Oh, I know it isn't factory, was just asking about lengths. The tee is on the tube, not the center housing, so that narrows it down.

I don't suppose there's a way to identify the original vehicle? I haven't seen any stamping on the tube itself, just on the third member, which doesn't necessarily say anything about the original car. Other than being a 741 case with 3.91 gears, that's the extent of the facts I have. :)

As for the flaring tool and bender, I considered it, but since I can get all new hard lines for about the price of investing in a tool which I'll use for one car, it's honestly hard to commit to that.
 
Well, I'll be. The local auto house DOES rent the tools. Problem solved. I must be having one of those senior moments, because it never occurred to me that the loaner tool program might have that.

Thanks, everyone.
 
An A-body 8 3/4 and 8.25” will not have the same brake lines regardless of the year of the A-body 8 3/4, because they’re not even the same overall width.

An A-body 8 3/4 is 52 5/8” flange to flange, an A-body 8.25” is 51.5”
 
Woodsman341 said:
I don't suppose there's a way to identify the original vehicle? I haven't seen any stamping on the tube itself, just on the third member, which doesn't necessarily say anything about the original car. Other than being a 741 case with 3.91 gears, that's the extent of the facts I have.
Click to expand...

First is confirming that it's an A body rear.
Use 72bluNblu's chart to figure out what it's from. It's not uncommon to have a transplanted B body rear in an A body.
An accurate 8 3/4" rear axle width list
Then order the year that's appropriate as determined by the vent location.
 
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