89 Ford d60, getting it modified at the machine shop to be a little wider and have the 31.5” spring pad spacing of the 77.5-79 d60s
Care to explain how their doing this? You can't machine into the housing 2 or what inches difference. Only way to do it right is to retube it....But explain....
So that d60 is the 36.5 spring spacing and I want 31.5 to keep tires off the leaf springs. So I’m getting the short side extended 5”, and that spring perch stays where it is because as you mentioned,it’s cast into the housing. But then moving the passenger spring perch inboard the same 5”. So that adds 5” width to the axle assembly giving me a 74.25 WMS, and also the 31.5” spring spacing.
That will help me keep my tires from rubbing both the leaves and the frame when turning, and get it a little wider at the same time. Also better drive shaft angle to (horizontally) so it’s not angled outboard as much as it would be if the housing was a lot closer to the driver side.
I’ll be using h2 wheels with 40s, those wheels have like a 5.5” backspacing so it won’t be super wide or anything, but will definitely have the tires out past the fenders
I’m also getting a internal sleeve welded in just to make sure everything stays as strong as possible.
You’re exactly right, have to either retube or cut and weld, I’m just going the cut and weld route and letting a machine shop do it to keep everything precise
Discussion here:
I have a 89 KP Dana 60 from a F350 and will be using it for a SAS on my 97 Chevy. I want to stay with leaf springs. I want to get this axle modified to be the spring pad width of the 78-79 D60s so bigger tires won’t rub on the leaf springs. What’s the best way to go about doing this? I’ll have...
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Here’s a doodle I did to keep from confusing myself with all the math:
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