How To Tell What Size Firestone Lift Spacers Are Needed On A Truck With A 6 Inch Lift Kit

Question:

ok here it is. I just put a 6 pro comp lift on my truck i know the rear isnt lifted as much as the front. Not real sure what size the blocks are in the rear, maybe like a 3 or 4 block but i do know the front is 6 So with that, i would go with the 6 spacers for the ride rite air bags? I just want to clarrify because i have gotten two or three different answers from the place that installed my lift. Thank you!

asked by: James C

Expert Reply:

To determine what size lift spacer to use on your vehicle with Firestone Ride-Rite Air Springs, measure the distance between the upper and lower brackets of your air helper spring kit, and whether the kit mounts on the leaf spring or the axle. The spacer needs to be the same length as the amount of lift applied to the axle on which the air helper spring is installed.

The axle mount kit would have the lower bracket mounted to the axle. The leaf mount kit would have the lower bracket mounted to the leaf stack.

On the rear, if the distance between the brackets is 8-1/2 inches to 9-1/2 inches it would be a 3 inch lift. For the axle mount you will need the Firestone Lift Spacers for 3 Inch Lift, part # F2368. For the leaf mount you will need the Firestone Lift Spacers for 3 Inch Lift, part # F2367.

If the distance between the brackets is 9-1/2 inches to 10-1/2 inches it would be a 4 inch lift. The axle mount would use the Firestone Lift Spacers for 4 Inch Lift, part # F2371. For the leaf mount you will use the Firestone Lift Spacers for 4 Inch Lift, part # F2370.

If the front is lifted 6 inches you will want to use the Firestone Lift Spacers for 6 Inch Lift, part # F2375, if your Ride-Rite Air Bags are mounted on the axle. If they are mounted on the leaf springs you will need the Firestone Lift Spacers for 6 Inch Lift, part # F2374.

I am including installation instructions for the Firestone lift spacers. It will show the locations of the upper bracket and the lower bracket on both types of mounts.