July 19th, 2010 · No Comments
1. Start by supporting the truck on 4 jack stands. The truck should be sitting at approximately the same angle
as it does on the ground or slightly lower in front.
2. Remove all the old suspension components from the frame. The front spring shackle mounts riveted in the
frame are used for a measuring point. The top of the frame rail should also be flattened in the area where it
is turned up for the old steering box mount.
3. The radiator support crossmember will need to be modified next. Figure 1 shows the rear section that will
need to be removed to provide clearance for the rack and pinion. The front section of the crossmember re-
mains in place to support the radiator.
4. Next the front frame section is to be boxed, using the boxing plates supplied. The plates fit up against the
rear of the radiator crossmember. You can grind the inside edges of the frame rails flat so the plates lay flat
against them, but do not grind off too much material as the rails will become too thin. The plates can set on
the lower flanges of the rails in the front, but most of the flange will eventually be trimmed away for the rack
C-notch and crossmember clearance. Fit the plates, weld and grind smooth.
5. If you purchased a complete I.F.S. Package from HEIDTS, it was supplied with Full Lower A-Arms. Begin by
installing the Spacers onto the crossmember. The holes where the lower control arms attach to the
Crossmember must be enlarged to 5/8”. Mount the Crossmember Spacers and the Rear Spacers which
were supplied with the Lower Control Arms onto the Crossmember as shown in Figure 2 using the supplied
Inner Bushing Bolts, Nuts and a temporary spacer under the Nuts. DO NOT use the A-Arms for this
operation as the welding heat will melt the rubber bushings. Tighten the Bolts and Nuts tight. Weld the Rear
Spacers to the Crossmember all around. Weld the Crossmember Spacers as far as possible inside the
crossmember on both ends. Position the Gussets horizontally, not vertically, against the Rear Spacers and
the back of the Crossmember. Weld Gussets to Spacers and Crossmember. When it cools, remove the bolt.
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Related Tags: 1939 chevy, bolts and nuts, c notch, figure 1, flange, flanges, frame rail, frame section, gussets, heidts, holes, horizon, mains, rack and pinion, radiator, radiator support, spacer, spacers, steering box, suspension components