The Apicella Designs mount kit for 1947-53 trucks replaces the rusted factory mounts under the back of an Advance Design cab. The kit bolts to the existing shackle holes, so the chassis needs no cutting. However, the cab has to come off. First, read the notes below, because the 1947 trucks need an extra step. Then measure twice before any hole goes in the frame.
Tools you will need
- A hoist or enough hands to lift the cab safely
- Drill with 1/8″, 3/8″ and 7/16″ bits, or a step bit
- Tape measure, square and a marker
- Sockets and wrenches for 3/8″ and 7/16″ hardware
The kit does NOT include the hardware that bolts the cab mounts to the chassis. However, the printed instructions suggest what to use.
Addendum for 1947 Chevy 3100: the 1947 Chevy 3100 does not have existing holes to locate these aftermarket mounts. Skip to Step 3 to get the proper measurement for the rear cab mount location — it should sit slightly behind the center running board mount. There are no holes in the cab floor; install the rear cab mounts, place the cab on the chassis, square it up, then drill holes using the mounts for location. Whether bolting or welding, carefully measure your rear cab mount location to assure proper fit.
Attention: to properly install the Apicella Designs 3100 rear cab mount kit, the cab must be removed from the chassis. Do not attempt to remove the cab without sufficient knowledge, adequate tools, and proper safety measures — doing so could lead to severe property damage, injury, or death. Apicella Designs LLC assumes zero liability for such occurrences.
AD rear cab mounts install steps
The AD rear cab mounts bolt to the old shackle holes, so the frame itself needs no cutting.
- First, locate and drill. Once the cab is removed from the chassis, locate the two holes where the rear shackles were mounted and drill them to 7/16″ in diameter.
- Mount to the chassis. Use 7/16-14 x 1 ¼″ bolts to mount to the existing shackle holes. If the cab mount doesn’t sit square to the chassis, use the included 7/16″ double-thick washers between the cab mount and the chassis.
Measure and drill the AD rear cab mounts
- Measure. Center of the front cab mounting hole to center of the rear cab mounting hole should measure 36 ¾″. Measure both the driver and passenger side. Front cab mount center-to-center holes measure 47″; rear cab mount center-to-center holes measure 49 3/8″. The mounting holes have slots, so these are approximate. Get as close as possible, then tighten all the rear cab mount hardware.
- Drill pilot holes. Once you have confirmed the measurements and tightened the hardware, drill through the 1/8″ pilot holes in the top of the mounts. Then drill carefully through the chassis.
- Open up the holes. Open the pilot holes to 3/8″ — a step bit works well and keeps it clean. Deburr the holes after drilling and install the 3/8-16 x 1 ¼″ bolts, washers, and nuts (not included).
Bushings and spacers
- Finally, install the bushings and spacers. Do this before the cab goes on the chassis. Each front mount gets a polyurethane bushing directly on top of the front cab mount, with a 3/8″ double-thick fender washer inside the cab and a 3/8 x 2″ large fender washer directly beneath. Front mounts use a 3/8-16 x 3″ Grade 8 bolt and Nyloc nut. Rear cab mounts use the same setup plus a 1 5/8 x 2″ Delrin spacer directly below the polyurethane bushing. The order is: 3/8″ double-thick fender washer, cab floor, 11/16 x 2″ polyurethane bushing, 1 5/8 x 2″ Delrin spacer, rear cab mount, 3/8 x 2″ fender washer. Use a 3/8-16 x 3 ½″ Grade 8 bolt and Nyloc nut. Double-check the tightness of all bolts during assembly.
Double-check all measurements prior to drilling. Verifying every measurement assures the fit and finish of your Apicella Designs product. The customer assumes all liability for any modification to this product and/or the vehicle being modified.
Note the 1947 3100 addendum above — the earliest trucks need the extra step. With the cab off, it is also the easiest time to fit a new firewall, and the 1947-54 firewall filler guide covers that job. Cab mounts, firewalls and interior panels for the whole generation are in our 47-54 truck parts collection.
For any questions or concerns with your install, don’t hesitate to email us at info@lsfab.com
Printable instructions
The illustrated version of this guide, ready to print for the shop.
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