Project: Rear leaf spring replacement
Purpose: The leaf springs that were on the truck when I bought it were the original stock ones with 1" blocks. There has been a worsening popping and clunking from the rear end when going over any bumps. I had a set of used leaf springs with Wheeler's AAL already added from a fellow Tundra owner. The bushings appeared in good shape on the replacements.
Tools needed
-A lift (so much better....thank goodness for a neighbor with a lift in his shop)
-Pole jack
-Socket wrenches (19mm, 22mm)
-19mm box end wrench
-Breaker bar
-Torque wrench
-Angle grinder with cut-off disk
-Dead blow hammer
-Brass hammer
-Pry bar
Duration
1 hour 15 minutes
Procedure
-Lift truck off ground, remove wheels
-Place pole jack (or in our case, really really tall jack stands) under the axle and push the axle up on the side you are working on
-Use angle grinder to cut off old u-bolts (so much faster than trying to take off the seized bolts). The first u-bolt you cut through will pop loudly.
-Remove u-bolts and lower spring seat, and remove the cut u-bolts from the spring seat once out. Save the bumpstop and plate that it is mounted to.
-Lower pole jack so the spring pack is a couple inches off the axle (I removed the blocks here)
-Use 19mm wrench and socket to loosen and remove the two nuts on either end of the spring (not the shackle)
-Use a hammer to push the bolts through and out. I used a pry bar to hit against the bolt once it started to come out.
-Use a hammer to knock the front of the spring pack out of the front mount...it will be tight
-Remove pack, then remove the shackle. Mount shackle in same orientation as original on the new spring pack
-Place new pack on the truck (make sure short end it towards the front), use a hammer to pound the front of it into place. Mount the front bolt first. Do not torque all the way
-Mount rear of the spring assembly, do not torque all the way
-Place new u-bolts on bumpstop plate, push the ends through the lower spring seat.
-Place washer and nut on each bolt, and then tighten in crisscross pattern until 98 ft-lbs
-When mounting the driver's side front, flip the bolt so that the nut is by the gas tank. When stock, the bolt is on the gas tank side, making it a pain to remove.
-Put all the weight back on the rear suspension (we placed a jack stand under the rear diff and dropped the lift until the rear pads just barely came off the frame)
-Torque all spring bolts mount bolts (6 of them) to 125 ft-lbs
-Remount wheels and test drive truck
I test drove the truck and it feels like these springs are more compliant than the old ones. They have much more arch than the old ones. There is still some sort of pop back there occasionally, so I will need to check the lower shock mounting bolts to see if they are loose.
Notes:
-Cutting off the old u-bolts was so much easier and faster than removing the seized nuts
-Wheelers 7.75" u-bolts stick out at least an inch once torqued
-I sprayed CRC Freeze-Off on the spring pack bolts for several days before I tackled this. I did not spray the U-joint bolts
-I used anti-seize on everything so I wouldn't have to fight corrosion next time
-Wheeler's AAL added more height than 1" block
-Block allows more droop (because axle is already pushed down 1" in relation to springs)
Measurements (center hub to fender)
Before
Ride height: 23.75"
Max droop: 29.5"
After
Ride height: 24.5"
Max droop: 28.5"
Before front and rear suspension refresh:
After
I wasn't looking to raise the rear anymore than it already was. If anything, I would have preferred it to drop down slightly to be more level. Maybe with a Brute Force HC bumper w/ swing out on the back it'll level out?? I'm already carrying 240 lbs of sand in the back, plus tire and Hi-lift. Now off to get it aligned so I don't destroy my new tires.