Shimmy in the rear.

New shocks. New wheels. New tires. Feels like it's in the rear. More apparent at 65-70 but it's intermittent. Sometimes fast slow. Not induced by bumps. I'm stumped. Ideas?

86 se-5 long bed.

65-70 sounds like tires off balance... I had the same issue till I got my eskies. Have you checked all you suspension components? Just saying I've had numerous nuts/bolts loose including leaf perches and the bolts connecting the driveshaft to the rear diff! Hope this helps I know how it feels I drive mostly highway and mine used to shimmy/shake all over the place.

New stuff good.Tires should be balanced already being new.But try jacking up the truck rear and put in neutral.Then place a can about a 1/4 inch from tire and roll by hand and see if the tires and or even the axle shafts are true.There should be no inconsistency in the distance between the tire and the can(aerosol cans are tall and work good).If things are out I would then pull the wheels off and check the axle shafts with the same technique.Unless you have a u joint or carrier bearing showing it's age that is what comes to mind.I had a bent axle shaft and had a nice wobble on one whl,it was bent at the hub area(no idea why).Make sure your wheels are torqued correct remove those lugnuts and double check!I make a point to not let any shop install my whls bc of the issue with aluminum whls getting @#$% up by impacts and improper torque.

Truck is bone stock. Other than a weber and ranger split bench. And I've checked my ubolts an what not. But not the driveshaft. Maybe it is the carrier bearing or just loose

a shimmy in the rear is exactly what we called it about 3 1/2 minutes before the right rear wheel fell off at 80 mph in chatenooga. talk about draggin. i think our issue may have been bad lugs tho cause they all came loose i think before they sheared off. we never found the wheel but i was lucky to stub my toe on the brake drum while lookin for it. had to take 3 lugs from the other side to limp up the road. good times. im glad it was a rodeo and not a mazda. good luck n be careful