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Old 12-23-2020, 04:00 PM   #1
my4dv8
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Default Truck rear axle with torque tube

We were give a decent looking rear axle with parallel spring mounts and obviously no provision for radius rods. But it appears to be set up for a torque tube as the pinion is 6 spline. I always thought truck pinions were tapered and keyed for the yoke and open drive shaft.
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Old 12-23-2020, 05:04 PM   #2
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Default Re: Truck rear axle with torque tube

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We were give a decent looking rear axle with parallel spring mounts and obviously no provision for radius rods. But it appears to be set up for a torque tube as the pinion is 6 spline. I always thought truck pinions were tapered and keyed for the yoke and open drive shaft.
It's possible someone welded those spring pads to a standard-type banjo rear. A "CAR" banjo center has a drain hole at the bottom for drainage from the torque tube, as seen in the first picture pointed-out by the pencil. Second pic shows the difference in the way the bolts are configured, between open drive and closed drive. DD










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Old 12-23-2020, 06:02 PM   #3
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Default Re: Truck rear axle with torque tube

Or...someone assembled that unit using passenger car banjo with jailbar tubes. Why??
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Old 12-23-2020, 06:12 PM   #4
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Default Re: Truck rear axle with torque tube

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Or...someone assembled that unit using passenger car banjo with jailbar tubes. Why??
It's just possible someone didn't quite like that transverse spring set-up. DD
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Old 12-23-2020, 06:25 PM   #5
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Default Re: Truck rear axle with torque tube

Yes just had a second look i thought it was an original never opened axle but it does seem a passenger car TT head with truck tubes , why?
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Old 12-23-2020, 06:38 PM   #6
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Default Re: Truck rear axle with torque tube

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Axle, would this setup even work , does the rear axle on parallel leaves move slightly rearward on the hangers as the spring flattens ?? And adding a TT stops this ??
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Old 12-23-2020, 06:58 PM   #7
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Default Re: Truck rear axle with torque tube

Is it possible somebody added the spring mounts and used it under a trailer??
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Old 12-23-2020, 07:05 PM   #8
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Default Re: Truck rear axle with torque tube

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Axle, would this setup even work , does the rear axle on parallel leaves move slightly rearward on the hangers as the spring flattens ?? And adding a TT stops this ??
You should remember that the torque tube set-ups used the transverse spring. The rear articulated in an arc about the transmission/u-joint connection. The elliptical spring set-up probably does allow the rear end to move fore/aft, which is where the sliding splines at the drive shaft front yoke come into play. I believe you have a 'mongrel' (put-together) rear end there. Lots of good parts for spares there. Or, a candidate for a light trailer. DD
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Old 12-23-2020, 07:12 PM   #9
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Default Re: Truck rear axle with torque tube

Having an automotive background, I need to ask are you sure a truck banjo casing would not have the drain hole? Surely in the interest of commonality, the same banjo casing would have been used across the board???

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Old 12-24-2020, 03:09 PM   #10
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Default Re: Truck rear axle with torque tube

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Having an automotive background, I need to ask are you sure a truck banjo casing would not have the drain hole? Surely in the interest of commonality, the same banjo casing would have been used across the board???

Mart.
Ya know Mart, I kind of jumped on that one thinking something else. You are likely correct, as I can actually think of no GOOD reason for Ford to have tooled-up a different banjo section. Merry Christmas across the pond, my friend! DD
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Old 12-24-2020, 05:00 PM   #11
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Default Re: Truck rear axle with torque tube

My 38 1.5 ton has a banjo rear with a closed torque tube and parallel springs. Unsure of a drain hole it's under the cab as I am mid stride of rebuilding the trans and engine. Might be a big truck. It has steady rods on it from the rear end to the torque tube.
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Old 12-24-2020, 06:12 PM   #12
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Default Re: Truck rear axle with torque tube

All the big truck rear axles I've seen look like this unless they are two speed.
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