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8 inch trunnion bushing


r686st
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I have a 1991 Mack RD690S with camelback suspension. I'm having trouble finding the correct trunnion bushings. My old ones measure 8 inches and some change but Mack and the aftermarket can only fine 4 and 6 inch versions. I have what I believe is 38K rear ends. Does anyone have any ideas?

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Assuming you have 38 rears, is it an SS38 (rubber bushed trunnion) or SSB38 (bronze bushed trunnion)?

If you have rubber, then you're being misled by the squeezed out distortion of the original dimensions. Don't go back with the Mack 10QK219P2 insulator. Upgrade to the Mack 10QK276 urethane insulator. The vastly improved service life is worth the addtional price. And always install the trunnion insulator with 20wt non-detergent oil, per the Mack service bulletin.

You can also upgrade to urethane lower spring pads (10QK388) for significantly longer service life (The upper pads remain rubber).

And don't forget to check the condition of your transverse torque rod.

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