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Old 03-10-2005, 08:45 PM
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C-5 rear suspension in older rod...

Hi all,

I've been pondering putting a C-5 rear suspension (minus the diff) in my '47 Ford coupe. Bob Shetrone from Progressive Automotive ,who designs a lot of this stuff, is telling me that this unit cannot be narrowed at all because of some bump-steer issues. My thoughts were to keep the A-arms "as-is" and mount them closer towards the center of the car, thus affecting a narrower track width. If I'm thinking correctly, the toe-in adjusters will be the only remaining issue to be solved. If I can keep the toe-in rods the same length as stock (by moving the inner ends past each other), would the bump-steer problem be a moot point?

As far as the diff goes, I'd like to use a Viper center section. They are all Dana 44 posi units, they're relatively cheap, and the "batwing's" mount points are 27" apart, which would allow for a very narrow frame. I don't know what the C-4 diff batwing measures, but it appears to be a lot wider than 27". Another alternative diff might be an 8.8" from a Cobra or Explorer (extremely cheap!)...

Right now, I'm just thinking on the suspension part of it and would appreciate any input.

Russ
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Old 03-12-2005, 12:42 PM
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TTT

No opinions ???
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Old 03-12-2005, 01:55 PM
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Requires some engineering

In order to narrow one of those the a-arms and toerods would need to be modified as well as the driveshafts..That woudl require some significant design time in order to get it right..not only do you need to worry about bumpsteer but also the camber curve as well..

If you are serious about this:
http://www.ssapubl.com/index.cfm?do=list&categoryid=14

and:
http://www.ssapubl.com/index.cfm?do=list&categoryid=8

Those books and programs can give you a good start on what you want to do..

OMT

Last edited by M&M CUSTOM; 03-12-2005 at 07:14 PM. Reason: Making the links active by adding the [url]&[/url] tags.
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Old 03-13-2005, 11:47 AM
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Thanks for the links. I managed to find my first pic of what the C-5 rear suspension is supposed to look like mounted in the factory frame (see attachment) and it looks like the frame is already as narrow as I'd want it. In fact, it may be so narrow as to preclude using the Viper diff. Now I'll have to see if the stock width C-5 suspension will work in my '47. IIRC, I had 72" between inner fender edges with stock fenders (I plan on using + 2.5" wider 'glass fenders).

Keep it coming!

Russ
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Old 03-13-2005, 12:36 PM
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Checking

Actually if you can get the hub to hub measurement of the C-5 and compare it to the hub to hub of the 47 you may be plesantly(sp) surprised..what difference there is may be able to be made up with wheel backset..Just one of those measure first deals..there should be someone (we hope) who knows just what the measurements are for the C-5 and if you have the existing 47 rear then you have that..

Take Care
OMT

Quote:
Originally Posted by S10xGN
Thanks for the links. I managed to find my first pic of what the C-5 rear suspension is supposed to look like mounted in the factory frame (see attachment) and it looks like the frame is already as narrow as I'd want it. In fact, it may be so narrow as to preclude using the Viper diff. Now I'll have to see if the stock width C-5 suspension will work in my '47. IIRC, I had 72" between inner fender edges with stock fenders (I plan on using + 2.5" wider 'glass fenders).

Keep it coming!

Russ
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