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br0k3N18

Measurement of rear end on 1/2

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I tried to find some pictures of 8 3/4 axles for comparison, but this is all I could find.

Axles.jpg

Here are some pics of an original axle in my 3/4 ton truck. (1/2 ton axles are the same) Not an 8 3/4" Axle.

PA220555.jpg

P4070360-1.jpg

PB040370.jpg

A dead give away between the two, besides their size, would be the wheel hub. An 8 3/4 would have a flanged axle shaft which would contain the wheel studs. The original axle would have a tapered axle to which the brake drum fits and is held on with a castle nut.

Merle

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Can't you guys read Merle's post?

The axle outer ends are vastly different. One is tapered with a keyway for the drum and the other is flanged and the drum just slips over the wheel lugs and axle center.

How can anyone believe they are the same?

Do you understand this axle terminology? :eek:

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Ok a 1952 Pilothouse truck diff is 62 1/4" wide from where the wheel bolts too.

It is an 81/4" diff. It looks the same as the 8 3/4" in this chart.

Axles.jpg

This is an 8 1/4" diff.

PA220555.jpg

The easyest way to tell the difference between 8 1//4" and 8 3/4" is to count the nuts (bolts, studs whatever) that hold the pumpkin ( carrier whatever) in.

PB040370.jpg

8 1/4 have 11 nuts, 8 3/4 have 10.

The other way to tell is the two top nuts are closer together on an 8 3/4 than they are on an 8 1/4.

Taperd axles (where the drum goes on) were used on 8 3/4 diffs from 57 to 64. Flanged axles started in 65.

There are also 3 pinion sizes from 57 to 72 but thats an other story.

Sorry for pinching the pics from another poster but they are better than the ones I have.

Forgot, there were some 8 3/4 that had an 4" pcd instead of the usual 4 1/2" pcd. They are rare but it pays to check.

Edited by Tony WestOZ

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Spring perches on a 1968 Super Bee 8 3/4 is 44 inches center to center.

Spring perches on a 1950 PH Truck is 44 1/2.

The big difference is the spring perches are on the bottom of a 1968 pass vehicle. The 50 Truck has the perches on the top.

1950 Truck axle's two top studs are 3 1/4 apart, the 1968 is 2 inches apart.

The flanges on a 1968 8 3/4 are flat on top, the flanges on the 50 are round.

the next 3 pictures are a 1950 orginal axle set-up

000_0519.jpg

000_0520.jpg

009.jpg

The next 2 pictures are of a 1968 8 3/4 axle housing

000_0512.jpg

000_0510.jpg

Next pictures are of a 1950 truck with a 60's 8 3/4 modified with the 1950 style perches put on top.

000_0517.jpg

000_0523.jpg

48D

Edited by 48dodger

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My turn.

The original axles in the pilot house series of trucks look A LOT like the Mopar 8 3/4 rear ends. They ARE different. At a glance you would think they are the same. Sorry, but no.

The 8 3/4 rears came in a variety of widths depending on year of manufacture and end use.

-Tapered axles (where the drum goes on) were used on 8 3/4 diffs from 57 to 64. Flanged axles started in 65. There are also 3 pinion sizes from 57 to 72 but thats an other story-

Very true.

MOST of the charts you find about axles widths and spring perch spacing do not address those used in trucks and vans.

Now to the original question. As best as I could measure it, my 52 B3B's original axle measured 62 1/2 inches from wheel mount face to wheel mount face. I installed an 8 3/4 axle from a mid 60s Dodge A100 van. It has a measurement of 61 3/4 inches face to face. I now have access to all new and available wheel cylinders, springs, cables, clips and drums, not to mention 3 different pinion sizes (read that as "strength") new bearings, and a myriad of ratios for your gearing. And it's all Mopar if you are something of a purist like me.

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When determining if an axle will fit, I consider the spring perches first. I don't think anyone was trying to say the axles were the same, we were going over the differences. Many of us on this forum have changed over to late 60's 8 3/4 axles for the "modern" advantages. The original question was answered a few times.

br0k3N18 "meh funk it, I dont care if its a 8 3/4 or not, just wantin to know the width of it so i can swap one in!"

yea...swap it in.:D

48D

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I put a 3:21 rearend from 73 dodge pickup in 53 dodge pickup. Used narrower mounts from 53 rearend. . Better ratio and much better brakes as they were wider shoes. I stand corrected on 8 3/4 rearends.

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Right on guys, I have access to an 8 3/4 from a 69 Bee...i'll "Test" Fit it and go from there:D Thanks alot for all the help and clearing up the mess, so correct me if im wrong (which is a VERY high possibilty) our trucks come with an 8 1/4?

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