[84LX89GT]

Subframe connectors tie the front and rear subframes on the driver's side and passanger side of the vehicle together, which keeps the body from flexing as much. This results in less squeeks and rattles as well as better handling. The front subframes run under the car until about the front of the front seat area, and the rear subframes go forward till about the middle of the rear floor board. If you look under your car you'll be able to see them. Some subframe connectors connect all the way from the front of the front subframe all along to the far rear, others have brackets that weld on and tie them together and there is also tubular subframe connectors that run along the sides and tie in with brackets.
I bought BBK (GRIPP name) subframe connectors. They are cheap, durable and although not the strongest, they're plenty strong for light drag racing and street use.
MAKE SURE if you buy subframe connectors to have them welded. Bolting them in will most likely result in them ripping out over time or under hard use.