98 Camry shakes only at 50 mph, not tires or wheels


I just bought a 98 Toyota Camry, and it has a shimmy between 48 and 53 mph. You can’t feel it at all below 48, and it gets almost totally better above 53, it’s just that range right at 50 that is bad. The car has 104K miles, and is on the original struts. I’ve ruled out tires by getting 4 brand new ones (nice Bridgestones), same shake. Also just replaced all 4 wheels, exact same shake. Can’t seem to tell whether it is from the front end or rear. Firestone says I need new shocks, but they seem to be pretty good from the bounce test. And Car-X says it could be a bent axle. Any ideas?

OK, sorry I just realized this was the wrong forum. I reposted the question in Car Questions.