when we swapped the 429/rebuilt c6 into the 71, we didnt save the speedo from the donor truck and the 71 had the wrong type. so we went to the junkyard and we got a speedo with the right tranny connector. so i installed it and it screwed into the cluster fine and went into the tranny fine. but the speedo no worky

id like to know how fast were going when were testing the 429's abilities
i dont remember if we grabbed the speedo from a dent or a bump. but i thought if both the ends connect then it should work. hmmmm