Re: Newbie ? on Jazz Bass Pups
Hi Quinn, Welcome to the forum
as far as I know, in most quality jazz basses, the neck pickup is slightly shorter than the bridge pickup. The two are for the most part non-interchangeable.
Here's the kicker, Last time I looked, some manufacturers were using the same size jazz bass pups in both the neck and bridge for their lower end guitars, I believe fender does this with the MIM Jazz Basses, as do a handfull of other companies.
Duncan pups measure 3.491 for the neck, and 3.605 for the bridge.
Now, I'd say the best way to determine what exactly you have is to first measure either your existing pups, or the pickup cavity to determine what you'll need.
If they're both the exact same size, determine which size pickups you'll need to get (either two bridge or two neck), and then check the DC resistance of both, and throw the hotter of the two pups in the bridge.
Hope that helps