So I also need to do this job, just turned 168k. I bought both the Transmax and Timken seals to compare. Both are about $3 at Rockauto.

The ID and OD are identical (0.5in, 0.75in) , and both are metal clad. The difference is the seal depth. The Transmax seal (84072A) is about twice as deep as the Timken and is rubber coated. Will be using the deeper version. Transmax looks identical to the AC Delco/GM version.

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