I want to try lowering my coupe by extending the ch***is and dropping the spring behind the rear axle. I want to avoid stepping it and cutting the floor out if anyone has done this would really appreciate some photos and possibly some measurements Sent from my iPhone using The H.A.M.B. mobile app View attachment 4565350
with the stock body on the stock frame it can only sit so low as the axle needs about 3"-4" of travel... . on my 10" channeled and sectioned '33 fiver I ran the rails just short of the housing, ran the rear crossmember and coil overs in front of the housing... letting it travel more than it could without the forward mounting... . could you mount your spring ahead of the housing ? … I made a square tube arm in the center that ran higher than the frame and out over the housing, mounted a body bumper under it... would hit the center section of the housing on a big bump... worked great... pix on my frozen computer sorry...
Take a look here... https://www.jalopyjournal.com/forum/threads/repost-pics-front-suspension-for-the-3w.64403/
If I am reading this right your talking about the rear axle. I have been thinking about this also. It looks like a spring behind puts the cross member in the curved panel which should mean no large hump in the trunk floor. A stock A rear axle sits under the spring and the clearance between the spring and the rear body mount bolt on my roadster is only 2 1/2 inches. I have never had the spring come in contact with that bolt. I would think it can be done if you can still have 2 1/2 or 3 inches of clearance between the frame and axle when finished. This would also depend on the stiffness of your rear spring.
I used a 40 axle with spring behind axle . Attached the A spring to the spring behind hangers, extended the rear of the ch***is by 7 1/2 measurement from memory . I camt tp the measurement by measuring from the centre line if the axle tube to the centre line on the rear spring hanger . That determined the extent of the ch***is extension. To extend the frame I used the rear section of a second frame that was pretty roached. I did a bit of measuring and worked out the best area to make the cuts so both sections could be grafted together without making any obvious alteration to the ch***is taper. I stagered the cuts and added a fish plate to the inside of the rail to bolster the join and also boxed the entire rear section of the frame from the centre X member back. Overall I think it dropped the rear by 4 to 5 inches. The tyres used in the pictures are only 600 x 16 so a taller tyre would both raise the rear a little and also fill the arch a little more too. You dont require a hump in the trunk floor
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