Thread: 4 link rearend

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hello all,
i have a 1928 tudor sedan that i built a custom frame for now it is time to mount the 8.8 rearend, would like to use triangulated 4 link and want to get it right so this newbie needs advice, i can mount the lower bars straight with the frame rails but the upper bars i can't seem to find what angle they need to be towards the frame rail if i weld the upper bar mounts as close to the pumpkin as possible it looks like about 70 degree angle, my question is what angle is needed to keep rear centered or what is the common angle, thanks for any help greatly appreciated, this car will be getting a coil over suspension in the rear also

There is no angle set in stone on the uppers in their relationship to the frame rails, 70 degrees would work fine. The bottom bars need to run parallel to the frame, the upper bars should be angled down from the rear end forward, 10 to 15 degrees seems to work quite well.

I went out and looked at my '33 to refresh my memory. Bottom links are parallel, mounted to the diff tubes at the frame width. The top links are mounted to the diff center section, just inboard from the tube to center section joint. If you project a line through the diff mounts on the vehicle center line the links point outboard at nominal 25 degrees, which says that from the diff the angle is nominal 65 degrees. If you bought a 4-link setup specific for your chassis the length of the links determines the mounting angle, and the angle is not really important, just that it's triangulated.

thanks for the info, i sure appreciate it

Be very cautious of pinion angle changes during suspension travel, try various mounting locations to keep your pinion angle consistent throughout travel.