Technical Rear radius rod length on shortened torque tube

I have been searching with no luck so I have to ask. I'm only in the mock up stages as of now and I'm trying to determine rear radius rod length on a shortened torque tube. I have a 27 ford roadster body and complete running gear from a 37 ford. Engine, trans, torque tube and banjo axle. Im not planning amy major engine work but to just run it they way it is. The torque tube is way too long and will need to be shortened. The radius rods will also be a lot shorter. What is an ideal length for rear radius rods? Originally they bolt to the torque tube approximately 18" behind the transmission. Will this location still be ok with the torque tube so much shorter? Do they need to go all the way to the transmission? I understand they can't be split or I'll be binding up the rear and breaking something.
Thanks
Ryan

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Ryan, you don't mention what frame you plan to use or at least what the wheel base is but on anything from a model A frame and newer the 42 to 48 rear radius rods work well. They are quite a bit shorter than the 37 to 41 rods.I usually shorten the torque tube at the factory joint where it meets the rear flange.Then,cut off the lug that the the rods mount to and move it to the proper location on the shortened torque tube.You could easily shorten the 37 to 41 rods ,as long as you already have them. You would also have to heat and adjust the mounting flanges on the rear of the rods to give them the proper angle.They don't have to go all the way to the trans .Make them mount to the torque tube on the large diameter section just before it steps down.Bob

 

Shorten enough to mount in original location.

 

Doesn't really matter as long as they're close to their original mount, they will need to be shortened as you mentioned. Their only job is to keep the torque tube and axle housing perpendicular to each other.

 

42-48 radius rods work good. No need to shorten. Might have to heat and bend them in more to meet up to the bottom of the torque tube

 

Thanks to everyone for the responses. I'll be using a model a frame with a kick up in the rear. Wheel base will be around 106". I was planning on using the 37 radius rods and shorten them down to fit

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