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Old 09-08-2009, 04:02 PM
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Rear 4-Link Frame Dimensions.

I am installing a 4-Link frame that is 20" wide on a 1951 Austin. I need the 20" frame so I can get 12" to 14" tires under it and inside the fenders. The outside tire measurement ( 60" ) will be the same as it was with a leaf spring and ladder bar setup. The rear axle will be narrowed to 45". This will mean the coil over shocks will be 12" apart. Is the 12" too narrow or will that allow it proper suspension and axle control vs. if the coil over spacing was ie: 24" ?
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Old 09-08-2009, 04:09 PM
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On the 20" frame you should be able to get the shocks out to at least 16" apart, as far apart as possible is of course better for control of body roll.

I got to ask, are the big tires just a looks thing?? Because you don't need tires that big to hook something as small as an Austin.
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Old 09-08-2009, 04:31 PM
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The 12" number is where the frame builder welded the upper mounts. Just wondered if 12" to 13" was enough or is that NOT good .
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Old 09-08-2009, 04:50 PM
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Alot of cars have been built at that distance and it seems to be fine, I just don't like it personally. You can't cut and move/replace the mounts on the frame to make it a better situation??
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Old 09-08-2009, 05:00 PM
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Yes, I was just looking at that. I could fabricate upper mounts outside the frame rails and could get a 24" spacing. That looks a lot better to me.
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Old 09-08-2009, 05:31 PM
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Quote:
Originally Posted by fredbaker
Yes, I was just looking at that. I could fabricate upper mounts outside the frame rails and could get a 24" spacing. That looks a lot better to me.
You probably already have this covered, but make sure you don't get into the tire. If you can get the shocks out to 24" without hitting anything, why was the frame only 20" wide?? Or is this a deal with someone else's unfinished project type of thing?? Just curious.
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Old 09-08-2009, 05:55 PM
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I ordered the frame from a company in California and told them exactly what I was doing and they said the 20" frame was their choice. Maybe they were thinking much wider tires. If I had it to do over, I would have gone with 22" or 24". At this point I need sound advise to continue or not. I could spread this frame as a last resort. If 20" will work then I will proceed.
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Old 09-08-2009, 06:22 PM
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It's not that it won't work, I was just curious about the 20" width if you had room to go out to 24" with the shocks. I would expect it to be fine.

Dealing with a company pre made frame like that is why I build my own frames to suit the vehicle and not use a "fits-all" type frame kit. They are just too "generic".

I wouldn't go to the trouble to split and widen what you have unless things just won't fit where you need them to be.
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Old 09-08-2009, 06:38 PM
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OK and Thanks, I was really concerned about the 20" because I get this picture of a dragster setup and that doesn't seem correct. I feel much better at 24" on the coil over mounts.
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Old 09-08-2009, 08:27 PM
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I have these set at 15'' apart.. And my wheel width is wider then your's... You might be OK... You want them as close to the tire as you can put them.. good luck..
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Old 09-08-2009, 09:00 PM
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How wide are your 4-link brackets set on the rearaxle and what rearaxle housing are you using ?
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Old 09-08-2009, 09:03 PM
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Quote:
Originally Posted by fredbaker
How wide are your 4-link brackets set on the rearaxle and what rearaxle housing are you using ?

They are 17'' center to center,, 9'' Ford..
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Old 09-08-2009, 09:14 PM
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How did you fit the inside brackets to the 9" Ford housing ? The reason I ask is because I am using a Ford 9" and the inner brackets are into the curve of the center housing just past the 3" axle tubes. I'm guessing it is 3-3/4" there and not round. The outter brackets are on the 3" part of the tubes. My 4 brackets have 3" holes.
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Old 09-08-2009, 09:15 PM
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Fred, I think you are on the right track in reconsidering the coil-over location. The width of the frame rails over the rear axle is really not an issue, other than it might make it easier to attach the upper coil-over mounts. The critical dimensions are the width of the four links and the width of the coil-over mounts. Mounting the rear suspension and the coil-overs as wide as practical will be worth the effort. For a lateral locater, either a Watts Link or a Panhard bar is the way to go for a street driven car. If going with a Panhard, go to the extra effort to make it as long as possible, and mount it so it is level at ride height.

Andy
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Old 09-08-2009, 09:24 PM
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Quote:
Originally Posted by fredbaker
How did you fit the inside brackets to the 9" Ford housing ? The reason I ask is because I am using a Ford 9" and the inner brackets are into the curve of the center housing just past the 3" axle tubes. I'm guessing it is 3-3/4" there and not round. The outter brackets are on the 3" part of the tubes. My 4 brackets have 3" holes.

I trim them to fit.. You can go with the track locater on the street with no problem at all...All the Dennis Taylor 41 willys are all done that way.. And some of them are running around with Blown big block's in them.. And I'm sure you know how many of them are on the street..
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Last edited by NEW INTERIORS; 09-08-2009 at 09:30 PM.
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