this thing had 1.80 straight cut gears. this was suppose to be a 1600 hp tranny , i had a local and reputable trans. shop come and look at the tranny before i pulled it to see if i had done anything wrong with the installation . everything on my part checked out ok. everything on sloans racing transmissions is in pieces ......... its all bad , but one of the things that really gets me is their service and the fact that i paid 2400 bucks the first time and the second time i paid them 1300 bucks to fix it the second time it broke....next tranny i buy will be from abruzzi. they are good, when i first sent the tranny back to sloans i made the mistake of sending it to abruzzi , and this guys said dont worry we will honor our warranty and fix it for you , the gears failed, and after they found out it was not one of their trannys , i had themsend it to sloans [ where i bought it ] and thats when mr. sloan did not back his tranny up and charged me 1300 bucks to fix it ...sloans racing trans missions suck , big time