lenco ratio again

called lenco and they say they dont make a 24 tooth sun gear only 22,23,25 etc I came home tonight and pulled hollow shaft out of clutch pack and it has 24 teeth on each end and middle. so 91 ring gear, 24 sun gear =1:26 right? 15 teeth on planet gears also. so whats up? what is this for? will it work for me? am I checking it incorrectly? if this is correct how did this car ever run 7.30 with this 2 speed on numerous occasions? I am definatly lost now and lenco says I have the impossible. any help on this rather me being dumb or not is really appreciated. thanks howard Also has 68% engrave in several places, what is this?

 

If the trans is a CS1 it has to be a 68%. The only ratio with a 91 tooth ring and 15 tooth planet gears is a 68%. The sun gear is 62 teeth. A 24 tooth sun gear couldn't be big enough in diameter to even mesh with the planets if the ring is 91 teeth.
http://www.lencoracing.com/c1gear.html
Brian

 

Sounds like your counting the splines on the shaft not the sun gear itself.

 

the 91 tooth is the highest lenco makes for a cs1 - which makes is a 1.68 1st gear. that is a steep drop off to a 1 to 1 for high gear. i run a 3 speed p-nut with a 1.80 1st, 1.44 2nd and 1 to high gear. i also have a 1.68 2 speed. the 3 speed has better 60' times and ets. the racepack shows less than 600 rpm drop off the 3 speed gear changes. the 2 speed noticeabley drops more rpms and thus loses et. the cs1 has a stronger reverser than the p-nut. if you can swing it, the 3 speed ratios are better and closer than a 1.68 1st gear cs1 2 speed giving you better ets, 60' times and tuning window. adding a 2nd case to your 2 speed is also an option to make it a cs1 3 speed with a lesser gear split/drop than the 2 speed.

 

OK, found my problem when I could not sleep at 3 am. Dannys right. On lencos website it shows the shaft as the sun gear. I finally figured out the sun gear actually allows the planets to revolve around it and it is still in the planatary set DUH . I still got a lot more to learn It is a 1:68 first gear. With the old chevy set up with this gear the car would 60 ft 110 to 112 which I thought was good for a 3000# car, but I see some are reporting around 106 times. Do you think with the new Hemi my times will slow down with this gear? going to a 3 speed is not an option right now. Does lenco offer a 1:80 to 2:00 first gear on just a 2 speed? thanks again howard

 

I think you can get most any ratio for a 2 speed. Call Dave at Lenco and he will head you in the right direction.