Quote:
Originally Posted by Robert Crandall
Thank you, Mr. Seymore, for posting this. I am preparing a 12 bolt differential from a 1966 C10 to put into my 1950 GMC. It will be a couple of months before I can get to installation, but your information is timely for me.
I made my brackets, and they are not installed. What I think I need to do is place the differential and not welded brackets onto the springs, with the pinion intentionally low, install the u-bolts, and put the weight of the truck on it. Next, jack the pinion up until the angle of the face of the pinion matches the angle of the face of the rear of the transmission. Then tack the brackets in place, remove the differential, and have a real welder complete that welding.
Figures 4-28 and 4-29 show the faces of these end components as being vertical. Mine are angled from vertical. My plan is to make these two angles match.
Will this be correct?
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Yes.
The engine/trans assembly will angle down, approx 3-5 degrees depending on manufacturer. The rear axle should angle up commensurately, but also accounting for any wrap motion during accel/decel.
If you are using leaf springs then you'll want a couple extra degrees windage in there to account for windup during acceleration.
K