In Syncro shaft chirp will not throw CEL. It will not throw a CEL when it is causing a bucking/hestitation issue over 3k RPM. The Syncro is not monitored for faults or 2500 RPM. Short of the shaft wobbling enough to strike the syncronizer into the housing, the CEL will not come on, But when it does strike the housing you get all sorts of lights, oil, and CEL because the gear that is turned by the cam just sheared and now you have no oil pressure. If you have gotten this far, its a new engine.
As for notice repair, highly discouraged, even a good back yard guy (the one that knows his truck in and out) would want to think twice. It is in a less then nice location and requires perfect re-insterion and a special alignment tool that may not be available at you rlocal Autozone. If you have pulled and clocked distributors multiple time before, by all means go for it, and use the same methodalogy (ie lift piston 1 to TDC compresion and mark), but still have the proper tool. I had a dealer in NJ change it, cost $250+ for part another $300 for diag and labor.
PS: the test to check if the chrip is the syncro. Remove serpentine belt and start motor (only for a minute or two) if the chrips there in syncros the problem. If not its a pulley so just turn up the radio.