sent you a message to let me know your email. i can send you pages out of spicer book. take it back to the shop and have them recheck angles. were they a driveline shop or just truck repair shop. maybe the driveline shop they had sublet driveshaft rebuilding would help. another thing were driveshafts balanced as a assembly or separate? if you want call me and we can check them out for you. just hate to see you pay twice for repairs that should be warranty.
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