Most 5th, 6th and 7th generation Corvettes have bodywork which wraps around the bottom of the car's frame rails. Additionally, some C6es and C7s have side skirts which extend an inch or so lower than the bottom of the frame rails.
Bodywork which wraps around the lower outside edge of the frame or which extends below the bottom of the frame rails will likely interfere with hoist arms which come in from the sides of the car. It may, also, interfere with the proper positioning of jack stands. The solution to these problems is a “jacking puck” which goes between the hoist lift pads or the jack stand saddle and the car’s frame rails.
Jacking pucks or, more properly, “jack pad tools”, became part of Corvette service environment just after the introduction of the C5 in 1997. A jack pad tool is a disc, or “puck”, about 2-in. in diameter and about an inch high with a “T” appendage on the top. Each C5/6/7 frame rail has two slots, one forward and one aft. The jacking pucks’ Ts are inserted into the slots then twisted such that the T holds the puck in the frame. One installed, their extra height keeps the hoist arm or jack stand saddle from damaging the car’s frame.
We've used several types of jacking pucks over the years. Our most recent jacking puck acquisition are a set of Reverse Logic's "Extra Tall Jack Pad Tools." After using them for several weeks, we feel this product is the ultimate jacking puck on the market right now.
The key difference between Reverse Logic's jack pad tools and others on the market is that they are made of DuPont™ Delrin® rather than aluminum or some other metal. Delrin acetal homopolymer resin is a crystalline polymer which has high stiffness and strength without glass reinforcement. Its properties bridge the gap between metals and plastics. Delrin is resistant to hydrocarbons, solvents and neutral chemicals. These properties along with its wear resistance make Delrin a good choice ideal for many industrial applications–including jacking pucks.
Reverse Logic jack pad tools come in two versions: standard height and tall. In a smart move, Reverse Logic engineered the tall version as two pieces, their standard height puck topped with an extension. The company also sells an "extension kit" for those who buy the standard version and, later, want to upgrade to the tall unit. Both styles of Reverse Logic pads have a socket head cap screw running bottom to top, through their centers. A "T-nut", which locks into the car’s frame, threads onto the top of that screw. Secured to the top of the puck by the T-nut is a neoprene washer which acts as a cushion between the car's frame and the top of the puck.
The CAC Product Test Team has been evaluating a set of Reverse Logic's Extra Tall Corvette jack pad tools. So far we've used them to support a 2012 Z06 equipped with the CFZ Carbon Package which includes carbon fiber rocker panel skirts which extend about two inches below the cars frame rails. The Extra Tall jacking pucks offer plenty of clearance when the car is lifted with a sidepost hoist. When used with jackstands they offer an extra inch of height compared to other jack pad tools on the market.
Although Reverse Logic jacking pucks are not intended to be permanently installed, however, they can be temporarily secured when performing maintenance for an extended period or taking the car a short distance to a service facility. Remove the T-nut and take off the nylon spacer. Reinstall the T-nut but thread it on until there is about 1/8" to 3/16" space between the T-nut and the neoprene washer. Stick the "T" into the chassis jack point and twist the puck clockwise a couple of turns until the tool is snugged up against the chassis.
We've been using Reverse Logic's pucks for about three weeks. So far, they do everything we expect from jack pad tools. We like their extra height. The finishing of the tools is very high-end. So far, their Delrin construction seems to a better choice than aluminum as we see less damage to the tool as a result of jack stand saddles.
We recommend the standard Reverse Logic jacking pucks (PN C28-63JPT) for C5s along with most C6s and C7s, however, if you have a C6 or C7 with any rocker panel skirts or extensions, you need the extra tall version (PN C28-63 15). For more information, see Reverse Logic's web site. http://www.reverselogic.us