My friends Camaro hooks on a good track but it hops going down the track. It has been so bad that his slow engine (8.70's 1/8) will spin the tires over at about the 30 to 60 foot mark. his big block runs low 7.s' on the 1/8 and tends to hop all the way down the track. Is this a 4 link adjustment or maybe time for new shocks.