Opinions & info please
I've been trying to set my pinion angle today. I have both pinion shaft and
trans shaft paralell. The drive shaft will be 57" long (1 1/2" longer than
stock. The center of the pinion shaft is 11" off the concrete floor. The
center of the trans shaft is 15" of the concrete floor. The truck ('55 1st
series 3100) is level. The best I can calculate this turns out to be almost
exactly 4 degrees. All the artices I've read and could find on the net say
that the angle should not exceed 3 degrees.
I installed a 403 Olds engine with TH350 tranny. I moved it forward about 1"
(for firewal clearance) I set it as low as possible in the frame. The rear
axle has been lowered (actually raised 1 1/2"). I'm really confused. I have
a longer driveshaft, I lowered the engine and effectively raised the rear
axle. All of these factors should cause a lower pinion angle than stock. Yet
I'm coming up with 4 degrees.
Does anyone know what the stock pinion angle of the AD trucks was?
I found several articles on the net and also a good one in "Street Rodder".
They all say about the same thing. The pinion and the trans shaft should be
paralell. The angle should be between .25 degrees and 3 degrees. Am I
missing something or what?
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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