Correct, the speedo ring usually will not work. We have one in Lynn's 2wd and so far we have had no problems from it. We busted a welded open carrier and a set of 4.88 gears before, then went to the yukon spool and 4.63. Since then just a stock axle and a u-joint is all we have had problems from, but thats with around 1000lbs hanging off the flat bed and another 400 behind the cab on a very tight track. Yes we are finally making enough power to break stuff lol.