Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by PetaKane, Jun 16, 2002.
And how do they affect bumpsteer and anything else they effect?
If you are referring to pinion shims, they are a tapered thin "block" that goes between the spring perch and leaf pack to obtain a more desireable pinion angle by lifting or lowering the pinion on the axle. They are usually used to match the angles between the u-joints on each end of the driveshaft to each other to reduce u-joint wear and vibrations through the driveline. Sorry, I don't know much about how it will effect the castor angle and what not on the frontend or how it will effect bumpsteer.
Depends on which shims you are refering to, pinion angle shims go between the rear axle spring perches and the springs and rotate the pinion upward to adjust driveline angles slightly. Steering shims adjust you castor angles on the front axle so help with any steering alignment issues you may have , most fullsize chevies do not need these unless you have put on aftermarket spindles, or bent something out of alignment. Pinion gear shims adjust how your pinon and ring gears meet.
And don't forget about carrier shims! /forums/images/icons/wink.gif /forums/images/icons/laugh.gif
and MANY OTHER SHIMS.....
like body panel shims...
and bearing shims.. although not hardly used on cars or trucks.
and washers stacked up as shims to keep the extra long bolt to hold the engine on the stand....
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