** 1977.5-87 models require clearancing (machining) of the front driveshaft CV cluster to prevent binding
** If vehicle has single exhaust, the cross-over pipe requires modification to clear the front driveshaft
**Optional extended length brake hoses are recommended. Click here for brake line options.
** 1988-91 Blazer, Jimmy, Suburban require additional sleeve kit 315-88.
** Vehicles with 56" long rear spring can use spring if shackle hanger is relocated on frame for 52" long application.
** Both driveshafts need to be lengthened
** Part 4310, 1" front driveshaft spacer, can be used instead of lengthening front driveshaft on 1977.5-91 models with Saginaw shaft