66 mustang 6 cylinder AT drive shaft behind 351w

[restomoded66]

Hi! I'm pretty much done installing my drive train in my 66 mustang, I got a 351w with over 400 foot pound of torque, t5z trans, king cobra clutch and ford 9" rear end with 3.50 gear. Will my stock drive shaft with 1260 u-joint in the front and 1260/1310 at the rear survive on the street or I should get a 3" or 3.5" shaft with 1330 u-joint. Thanks!

 

[shoguun]

if its from a 6 then im gonna say no. to weak and i think the spline count is different. best off going to a drive shaft shop and have them do it for you

 

[rbohm]

if its from a 6 then im gonna say no. to weak and i think the spline count is different. best off going to a drive shaft shop and have them do it for you

+1 the six cylinder U-joints are too small, as is the driveshaft tube.

 

[restomoded66]

Thanks! I was hoping to get away with a 30$ conversion u-joint to fit my 9" rear end.

 

[68stang351]

No it won't.
I've ran around with the stockish 351w/T5 in my former 6 cyl car for a while and found out the hard way that wouldn't last. I broke the rear also.

 

[restomoded66]

Thanks! I got a 1330 slip yoke from the Lincoln Versailles I got my rear end from. Should I get a 3 inch or 3.5 inch drive shaft build?

 

[rbohm]

as lon gas you are making less than 600hp a 3" tube will do nicely.

 

[restomoded66]

I found an explorer aluminum drive shaft for cheap. It is the right length will it hold up or they are too thin. Thanks

 

[rbohm]

that should do pretty good. it will last longer than the six cylinder drive shaft will.