Little info on the car before the questions.. Some of the parts converter, rear gears, ect.. I am running becasue I already had them from picks when getting the car togeather. I have a 65 Valiant, Mild 340, Ported x heads, Comp Xtream energy cam, Holly 750bp. The trans is a 904 and have a Turbo Action 10" converter, belive its a 3500 stall. The rear is a 8 3/4 had 5:13's now has 3:73's. Its a small bolt pattern car and has custom ordered 17" rims, rear tire is a 245-40 ZR17, on a tape it seems about a 24 1/4" tall tire. The car has been on the road for a a few months. Runs very strong, fast ect.. but blows through gears, seems to run at a very high RPM. The wheels were custom order and not really a option to run a different wheel for more/taller tire options. Wanting to know if this Converter, wheel/tire hight, gear combo is just not a good combo. I am planing on in the near future trying to go with a taller tire but there is not alot of options and the ones that they have are only a bit taller. Ideally would like to keep the converter becase its a pain to swap out. I am wondering if lower gears would help and ifso what would be ideal, I was going to go with 3:55 but changed to 373 last min, wish i would have stayed with the 355's... Any and all advise is greatly appreciated, Thanks Nick