Rear coil spring adjusters, manufactured by Budzter Enterprises of Stratford, Ontario, Canada, were installed under each rear coil spring in order to adjust the pre-load for maximum traction off the starting line.

The installation was fairly simple but did require the removal of the rear wheels, shock absorbers, and springs. Some cutting was required with a hack saw on the stock spring mounts located on the axle tubes, after which the spring adjusters bolted easily in place.

Do you need pre-load?

When the adjusters are set equally on both sides, they can be used to set the height of the rear of the car and still retain the full use of the rear springs. When they are set unequally, they provide pre-load on one side or the other as required for maximum traction on launch.

This product was chosen for pre-load adjustment over such products as coil spring spacers or air bags in the coil springs for the following reasons:

Why Eric Chose Budzter Coil Spring Adjusters

1971 Pontiac Le Mans
Owner - Eric Grose, St Marys, Ontario

Small Block Chevy
2400 Stall Converter
3.73 Gears
Best ET - 12.12 Seconds
Best 1/4 mile speed - 112 MPH
Best 60 ft. Time - 1.68 Seconds

Owner/Driver History

1. Very small adjustments can be made easily with a wrench and the adjustment will not vary.
2. Spacers cannot be adjusted after they are installed without removal
3. Air bags require a source of compressed air for adjustment and the setting will vary with changes in temperature.
4. Spacers and air bags will alter the spring rates whereas Budzter Coil Spring Adjusters will not.
5. A form of pre-load adjustment is absolutely necessary for maximum traction on the street or strip and for consistency in drag racing competition.

In my opinion, Budzter Coil Spring Adjusters are an excellent, reliable product which are superior in every way to the alternatives of unequal rear springs, coil spring spacers, or air bags.