do i need a jack shaft?

[IHcubguy]

I plan on getting a 40 series torque converter combo, I'm using a 8hp briggs with 1" shaft ! I was wondering do i need a jack shaft? Or can i put the driven directly on the axle! I have a 1" axle i don't know if they make a driven that has a 1" bore instead of 3/4"bore, could'nt find one, and order a belt to fit! Only reason is i don't know if i have the room for a jack shaft set-up. maybe i do...thats the reason i'm askin!! Here's a pic(dates wrong i took it a month ago).. it does'nt look like this now, many changes,and i installed a disc brake, so that gap between the frame and the sprocket is much smaller, it's 99% done now i'm just trying to figure out the best clutch, i would go with a centrifical i think thats how you spell it! probly not, be anyway i just think the torque converter combo would hold up better and have more range! I'm a bit rough on stuff so i just want something that will hold up! thank you much!!

 

[BAMBY]

you really should have a jackshaft... even though you have an 8hp, you still need a jackshaft to get a higher gear ratio. with the torque conv. alone, you might get 3.XX:1 max... you need something inbetween 5:1 and 10:1 on the high end of the converter. if you have the tcv only, the ratio will be so low that it will be real hard to get going, but once you do, your top speed will be insane...= not good.

it looks like you should have room for a jshaft too, so my .02 is u should get one.
hope this helps,
BAMBY

 

[IHcubguy]

Thanks BAMBY Ill look into it.