Chevelle Restoration and Authenticity Guide 1970-1972. Dale McIntosh

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       This particular Chevelle was used extensively for drag racing in its early life. Many hard launches caused the axle tube to break the plug welds loose. This not only caused the tube to walk itself out a 1/4 inch but also rotated the tube slightly. Had this not been addressed during the restoration, you would continue to have issues, some of which could have had an ill-fated outcome.

       Engine, Transmission, and Driveshaft Removal

      If you have not already done so, it is time to remove the engine, transmission, and driveshaft. Again, fully document everything you disassemble. Start by disconnecting any components related to the drivetrain, such as electrical, fuel lines, exhaust, and any remaining transmission or carburetor linkages. If you are saving your exhaust—and this cannot usually be done very well—carefully remove the exhaust tips, tailpipes, mufflers, and the head pipes. Once those are removed, proceed by removing all the hangers. If you do not intend to save the exhaust, then just cut them apart using a tool, such as an exhaust cutter.

       Engine Removal Preparation

      Unbolt the engine mount through bolts found on either side of the engine. If this is an original or unmolested car, make note of the direction of the bolts and motor mounts. Original assembly-line engine mounts had a swaged nut on one side of the engine mount, allowing the assembly worker to simply install the bolt through the mount and not have to worry about putting a wrench on the nut on the other side. Replacement mounts did not come with this and required installing a nut and lock washer onto the bolt. However, when reassembling the engine onto the frame, you can still simulate factory mounts by at the very least installing the bolts in the same direction as the factory did. On the driver’s side, the bolt was installed from the rear toward the front. The passenger’s side is just the opposite since it uses the same part-numbered engine mount, and the bolt was installed into the front side of the mount.

       Either of these two tools will work well to remove your old exhaust system. If you already own a Sawzall, that is the quickest and easiest way to remove it. The exhaust pipe cut-off tool can be purchased for less than $30, which is also a good alternative. In a pinch, simply use a hacksaw.

       On assembly-line engine mounts, the nuts are swaged onto the mount and do not require two tools when tightening. If you no longer have the original mounts, you can simulate this by using thin nuts and orientating the bolts from back to front on the driver’s side and front to back on the passenger’s side.

      Unbolt the two bolts that hold the transmission mount to the crossmember. Take special note of how the washers are placed on automatic cars: two large washers should be mounted between the transmission tailshaft housing and the transmission mount on either side. This aids in pinion alignment and is very important.

      Remove or cut the rubber fuel line(s) running from the frame-mounted fuel hard line to the fuel pump. Inspect the fuel line(s) to see if they may be an original with ink stamping such as “SWAN GAS” or “EVAP” so that these can be replicated during the restoration process.

       Note how there is a large washer installed between the top of the transmission mount and the transmission tailhousing. This is only on automatic cars and must be put back in this way, as it affects the pinion angle. People often install the large washer under the lock washer and bolt on the top mount to tailhousing bolts, and that would be incorrect.

       This is just one example of the stripes that you may encounter on your drive-shaft. The color codes will be found in box 19 of your build sheet and in this case marked PK-BL. It is widely believed that the thin orange stripe denotes that the shaft has been through the balancing process.

       These are just some of the many types of fuel and evaporator lines you may encounter during your restoration. Keep your original lines and replicate the markings if you so choose. Some of these lines are available in the aftermarket, but with most you will need to replicate the stamps and stamp your own. Many of these will also have date codes on them.

       The meaning of this yellow grease pencil marking on the aft part of the driveshaft has not yet been determined, but it has been found on many 454 shafts and always at the rear. It is likely that it is just another way of marking that a part of the machining or assembly has been completed and checked or tells the installer to put that at the rear during installation.

       Driveshaft

      Remove the driveshaft at this time. Before doing so, have a pan ready and lay it underneath the transmission output shaft to collect transmission fluid that may leak. If not already done, drain the engine oil at this time as well. Be aware that even more antifreeze, engine oil, and transmission fluid may leak from these areas when the engine and transmission are tilted up for removal, so prepare containers to catch these fluids.

      Remove the four universal-joint U-bolts or through bolts, nuts, and straps, whichever your car has at the rear U-joint. Wrap duct or electrical tape around the U-joint so that the bearing caps do not fall off the U-joint and cause the loss of some of your needle bearings. Carefully set the rear end of the driveshaft on the ground (if you are not using a hoist), then pull the front slip yoke from the transmission tailhousing.

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