Chassis Engineering Inc. founder Roy A. Lewis passed away Tues. October 17th, 2017.

Services will be Saturday October 21, 2017.

Visitation 10am, Celebration of Life 12pm.

Henderson Barker Funeral Home in West Branch, IA

He will be greatly missed by all who knew him.

AS-1019CG Complete Leaf Spring Rear End Mounting Kit for 1941-1948 Chevy (Gas Shocks)

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AS-1019CG Complete Rear End Mounting Kit for 1940-1948 Chevy (Gas Shocks)

AS-1019CG Complete Rear End Mounting Kit for 1941-1948 Chevy (Gas Shocks)




Bolt-on Rear End Leaf Spring kit for 1941-1948 Chevy car.

The AS-1019CG kit fits a wide variety of rear ends (up to 3" axle housing diameter), depending upon the off set of wheels and tire choice .

We recommend aprox. 60" for 41-48. 

When you order, please specify the rear end you are using


This rear end kit includes the following:

  • Chassis Engineering 2-1/2" slider leaf springs
  • Front and rear leaf spring mounts
  • Leaf spring shackles
  • U-bolts
  • Leaf spring pads
  • Shock mount kit
  • New gas shocks
  • Hardware
  • Instructions



Prevent your suspension from bottoming-out and expensive vehicle damage by including a pair of adjustable rubber snubbers (link) with your order.




IF-3739CP Mustang II IFS for 1937-1939 Chevy

Chassis Engineering Installation Instructions for 1941-1948 Chevy Leaf Spring Rear End Kit



Please read the instructions carefully before you start putting things together.

Step 1. 

  • Remove the original spring hangers by drilling out the rivets. 
  • Be careful because the holes are being reused.

Step 2. Spring mount (front)

  • Line up the holes in the mount with the rivet holes (same ones of the original mount). 
  • The offset goes to the rear and outside. 
  • Clamp it in place and ream-drill for 5/16" holes. 
  • Then bolt the mount in place.


(Do not install the front brackets backwards, because the center line rear axle will end up approx 3" to far backwards)

Step 3. Spring mount (rear)

  • The left and right mounts are the same. 
  • The offset goes to the outside. 
  • The two front holes in the new mount match the two front holes from the original mount. 
  • Clamp the mount in place and ream-drill the 2 front holes and the 2 rear ones through the bracket to 5/16".
  • Bolt the part in place.


Step 4

  • Bolt springs in place (2 clamps to the front). 
  • Front uses stock bushing. 
  • Rear is empty to accept the furnished shackle. 
  • Install the shackles.



  • When tightening the shackle nuts, the outside shackle plate seats on the shoulder of the shackle studs and not when the bushings smash.


Rear Shock Kit

Step 1. 

  • Clamp upper combination shock mount / swaybar mount to the frame in the location shown.


  • On some cars there might be a bit of interference with the spare-tire well. Modify the well as needed. 
  • The tube goes below the frame rails, not in-between. Drill frame to 5/16" and bolt upper mount in place.


  • Install shock studs (from shock hardware bag) pointing forward.

Step 2

  • The spring retainer is used with the shock mount angled down. 
  • Spring retainer is installed with stud towards the inside and pointed backward.



Rear end pads:

Step 1. 

  • Weld pads (spring and swaybar) on the rear end in these locations. 
  • We suggest a tack weld until you can check pinion angle with complete weight on the car.

Step 2. 

  • Pinion will normally point up at 4 degrees. 
  • Swaybar pads should be straight (parallel) with spring pads, pointing forward.

Step 3

  • Slip U-bolts over axle and bolt unit together and install shocks.



  • New springs will normally drop up to an inch in the first 500 miles of use. Depending on the weight of the car, new springs can have a slight arch, sit flat or be slightly reverse-arched. This is normal.
  • The spring is acting like it should. Also, parallel leaf springs are almost never perfectly parallel, it is just a name for this type of suspension.
  • We do not recommend hard bushings of any kind for springs. Rubber bushings will absorb vibrations and road noise and allow for some flexing.