Really appreciate this Larry ; the warning aspect is super important ..maybe we need a section on website about known 300 failure modes like the throttle on ram cars sticking or JK boisters that have been messed with . That being said , the AAJ kit or any other important part of a car has to have the bolts torqued properly ( engineer hat on-- ) just like rod bolts . When torqued properly the bolt stretches slightly , like a thick rubber band and will not "back out" . I do not know if they spec a torque .. If not they should . I was victimized by a mopar steering falling off the frame in a restored Cuda ( Jamie H found the problem) all stock stuff assembled by a guy who did not torque the mount bolts. One was gone it was hanging loosely on 2 after 900 miles ; i was looking for steering linkage issue , all brand new . Almost got killed on 90 due to this , evolving poor control of car between two trucks 8" away . Had this again on 4.0 jeep motor mounts after engine rebuild . Bolts got loose and then broke off , due to back and forth loading once they could move . Never happens to the factory jeep . So , broken tabs etc with only one bolt holding it may not be a design problem , it may be a loose bolt problem . Safety wiring on planes usually means the bolt has been torqued and provides indication of that ; it is not the same as say a castellated nut and cotterpin , which will positively stop any turning . Grade 8 or ARP bolts torqued correctly ought to be safe .. And loctite helps , but locktite is temp sensitive . Like lug nuts .. Same deal . GM bolt too ? Sometimes you see a dot of paint on critical car bolts when new . Same thing; they have been torqued to a spec . Torque converter and crankshaft bolts are another area where you see this issue . It can happen to anyone not usiing a torque wrench on critical bolts . John
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I have 2 AAJ conversion on 2 of our 62's. I too had that problem with the Caliper Bolt Pins coming loose, and backing out. I now add lock tight to the threads to keep 'em from walking out of their home.
Two recent troubles with AAJ conversions I have installed. One: my 66 300 rag. The upper caliper rod that holds the two halves of the GM caliper together, fell out. This left me with a curious "clunk" when leaving drive ways or over a speed bump. This must not have been too serious as I drove it months and miles in this condition before discovering that the 5 inch long piece was missing and NAPA has plenty of them called caliper somethings at little cost. PC photo of 76 Monte Carlo will show the part at the NAPA counter. Two: my son's 68 Charger. With my favorite grandson and Robert leaving soccer practice, he felt something wrong in the brakes and made two circles of the parking lot whereupon the entire caliper and pads broke off the AAJ part and lodged those parts high in the wheel well making steering impossible and zero brake pedal. (Why no pedal? neither pot lost any brake fluid but the rears didn't function either) Two hours wait for AAA but all are home safe. I have a photo of the busted AAJ part with one of the two bolt holes shattered. Guessing the other of the attaching bolts had fallen out leaving the remainder to support the entire brake system. It couldn't. Thank God it didn't happen last week when he made three passes at the 1/4 mile. Mid 14's at 100 mph Lesson learned: Probably these two main bolts must be safety wired or cotter pined. Certainly the two main bolts plus the two minor spacer bolts on the GM caliper should be inspected routinely rather than just ignored. I will be inspecting my two remaining disc conversions today and insuring the two main bolts are to be permanent party Larry Jett 510 794 7911 I live in my own little world but it is OK: Everybody knows me here. ![]()
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Posted by: John Grady <jkg@xxxxxxxxxxxxxxxxx>
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