Cascade Crew

blue89 · Posted: Tue Sep 16, 2008 9:33 am Post subject: Driveline diameter clearancing

Does anyone have any idea's on how to run a 3" diameter driveshaft? I would like to run a larger shaft so I can get bigger yokes and knuckles but I was told that it will hit the torque arm. I'm going to pull the torque arm mount off the tranny and onto the crossmember but don't see anyway to clearance the axle side of the mount without cutting the middle out.

redlava · Posted: Tue Sep 16, 2008 11:25 am Post subject:

i thought i was still a direct bolt in for a three inch drive shaft. You would really only need a .25 inches of clearance. I could see a problem if you had a rave shift loop though.

blue89 · Posted: Tue Sep 16, 2008 11:28 am Post subject:

So its no problem? The guy at the driveline shop made it sound like it wouldn't fit. I'll get some data to him and let him know.

aaron_sK · Posted: Tue Sep 16, 2008 11:45 am Post subject:

I haven't measured it, but I believe that the aluminum shaft from a '99 SS in my IROC is 3", and it fit fine with both the stock 700R4 setup, and the T-56 swap.

blue89 · Posted: Tue Sep 16, 2008 11:59 am Post subject:

Well I don't know what he was worried about. The real problem is this, my TH400 has the truck tailshaft so it has the u-joint bolted to the rear of the shaft. This means I have to run a slip-yoke in the middle of the driveline like a 4x4 truck. If I can fit 3" then I can get the burly slip yoke and I'll never have a problem.

Its worth it for me to keep this tranny instead of buying a used one from someone. If I bought a new one I'd have to have it rebuilt and I don't want to pay to have it done. So $300 and it will be running versus $1500+ to get a new one.

91RSVert · Posted: Tue Sep 16, 2008 2:03 pm Post subject:

The Ls1's had 3" shaft and they fit. Also, I think the alumns that came in a few of our cars were 3" also.

Really, its the joint at the rear that has the clearance issue, and it really cant/doesnt need to be any bigger then what we already have.

What you may have problems with is that slip yoke that your putting in the middle. How much bigger then 3" is that?

blue89 · Posted: Tue Sep 16, 2008 2:55 pm Post subject:

K, I called him back and told him 3" no problem. So he's quoted me $380 with tax for a 1-7/8" slip yoke with rear u-joint that will work with 10-bolt or ford 9" if you swap the caps. Think this is the way to go? I would hate to spend money if there is a better way to do it. He made it sound "unbreakable" with my setup. Sure hope so.

Schultzy89GTA · Posted: Tue Sep 16, 2008 4:31 pm Post subject:

What is he selling you for that figure?

chevymad · Posted: Tue Sep 16, 2008 5:15 pm Post subject:

You can use a slip style yoke in that th400. Just get a new yoke and seal, then remove the bolt. I've done it before with no problems.

Twilightoptics · Posted: Tue Sep 16, 2008 6:01 pm Post subject:

blue89 · Posted: Wed Sep 17, 2008 7:13 am Post subject:

chevymad · Posted: Wed Sep 17, 2008 9:23 pm Post subject:

The seal thats in the rear of the trans needs to be replaced.. The fixed yoke style isnt made for the yoke to slip back and forth. But without the driveline in, its just a simple pop out the seal and pop in the other style.