Propshaft question

[Digger]

When you extend the chassis on a big rig it's only natural you have to extend the Propshaft as well, I can't help thinking that on a 1.1 rig would the Propshaft be that long without some form of support either a split prop shaft or some other form of setup. I can't help thinking it doesn't look right that long. The shaft on the kit is 5 inch long approx add another 2 inch, 7 inch seems to much , hence the question. Any help please.

[Fat Brian]

Typically trucks with very long chassis use one or more carrier bearings along the frame to support the driveshaft. 

[Digger]

Thanks for getting back to me. Is there a U J on both sides of the support?

[Muncie]

There are some truck kits out there with simplified one-piece drive shafts that would have a mid-ship driveline support in the real world.  General rule. the driveline should be no longer than 70 inches between the centers of the u-joints.  The drivelines do not go straight thru - there is a small angle between the drivelines so the bearings in the u-joints move to stay lubed.  There is a fair amount of engineering in it.

[Digger]

Thanks, so let me get this straight there's a U.joint both sides of the support , so I need to make a support and two Propshaft. The one that goes to the rear axle needs to be angled down, is that right ?

[Ace-Garageguy]

41 minutes ago, Digger said:

Thanks, so let me get this straight there's a U.joint both sides of the support , so I need to make a support and two Propshaft. The one that goes to the rear axle needs to be angled down, is that right ?

Check your specific application.

There's not always a UJ on either side of the center support.

My LWB Chevy pickup, for instance, has three UJs total: one at the trans yoke (2), one at center yoke (10) behind the support bearing (6), and one at the diff end of the rear shaft (11).

Edited January 11, 2023 by Ace-Garageguy
CLARITY

[Digger]

Thanks to everyone,and to Ace- Garageguy for the diagram, I have just found a video of a truck on its side and it the same setup as the diagram. Now I've got something to work by. Thanks to everyone ?.