trok

So just a quick update. Tucson620 was patient enough to help me figure it out. The five speed conversion on my truck is using a 620 front shaft. The center bearing is from a 620 making the 521 bracket to small thus why it was cut to make it fit. Hessianben's post clarified the solution so now I'm in search of 620 center bearing brackets. If anybody has those available I'd definitely be interested.

Just read your post wayno and think your right. Going to research what the carrier is from, just assumed it was factory initially. Checked some of the wrecking yards but none of them seem to have 521's out here.

Thanks for all the help guys, after looking at tucson's carrier bearing it seems like mine is not original. Not sure what mine's from, but now it makes sense why they would cut the bracket to make it fit. Next question would be if there's a factory bushing still available or replacement. Other than that, think I might just have to go to a single drive line.

Thanks tucson, the truck is a faded mint green mixed with rust, ha. It's hard to see in the pictures but the bracket is split on top but not necessarily bent. My theory is that the torque from the power train gets expelled through the drive shaft and finds the paths of lease resistance i.e. rear axle carrier and improperly mounted center bearing. Maybe it's easier to just pony up and get a single shaft. Does a single shaft have enough clearance at stock height? If anybody has the brackets though let me know. Thanks again.

Thanks Wayno, As far as I can remember the rubber piece is rounder more donut like, then there's a flat metal ring around that. I thought about welding an extension piece but I'm still missing the bottom bracket so the bearing is butted up against the subframe. Might do that as a last resort, does the bearing/ donut appear factory though? Not sure if this makes a difference but the tranny is from a 280z. I am in the Portland area by the way. Truck is drivable, just clunks when I'm under load. Mainly on takeoffs.

Hey Guys, thanks for the advice so far. I'd like to try and keep the twin shaft if possible just in case I want to lift it later. Would a single shaft hit the crossmember if brought back to factory height? Pics are below of the truck and center bearing bracket. I'll take better pics later as these don't do it justice. Looking forward to the datsun wisdom on this bracket situation.

Hey guys new to the forum. Long time auto guy that recently acquired a 521. Needless to say it's an amazing little truck that puts a smile on my face when I drive it. Pics of the truck soon to come. After introducing myself I'm naturally going to ask for something, ha. I'm in search for an upper and lower center bearing bracket. For some reason the PO only has the upper installed but split it in the center in order to bolt the center bearing down to the cross member. I welded the bracket back together but the mounting holes didn't line up after so i had to recut and bolt down again. Not sure if the center bearing is original hence the split bracket but needless to say the shaft wobbles under load. I know I could go solid driveshaft but was hoping the bottom bracket would be the key to my problem. Any insight guys or possible brackets laying around in someones garage? Love the forum, thanks in advance.