The Alfa Thread

[LateFan]

If anyone is tuning in and hasn't seen one, this is the 105 rear axle "trunnion." It's a smart system - that lightweight aluminum arm (OEM is steel) serves as the short trailing arm and the lateral locator for the rear axle assembly. Long trailing arms mount to the bottom of the tubes and carry the spring perches. So the axle is perfectly located and can't rotate or tramp. It's an evolution of the design in the 750/101 rear suspension.

[LateFan]

Dan Zebel? / Jack Beck?

http://www.alfabb.com/bb/forums/giulietta-giulia-1954-65/196596-105-rear-axle-into-101-spider.html

[LateFan]

So the A-frame mounts to OE brackets on the body? Were they moved or bent at some point? If that's all stock and the bushings (and shims?) are right, it's in the diff mount...or the trailing arm bushing as you said. hmm..

[BlackbirdM3]

I must have missed something - did you swap in a 105 rear end and trunnion? How different are they?

As Nader says, misalignment there can mess up the way it tracks through corners and make it a handful. What say the gurus of AlfaBB about this?

Its a 105 rear end (4.1 ratio, 54% lockup LSD) modified to fit a 101. There is no T shaped trunnion, but an A shaped arm that locates the whole thing. It looks like this...


The upper point of the A mounts to the differential, the bottom attaches to the body.

I'd think the trailing arms would be more prone to causing things to sit crooked, but they look identical, and are both the same length. Perhaps its something stupid that I'm over looking, but I'm not sure.

Will

[LateFan]

A lonely Sprint

[LateFan]

I must have missed something - did you swap in a 105 rear end and trunnion? How different are they?

As Nader says, misalignment there can mess up the way it tracks through corners and make it a handful. What say the gurus of AlfaBB about this?

[BlackbirdM3]

Huh. How about where the trunnion attaches to the differential? If things were relocated by welding, you’re going to want to make sure everything is squared up. Those dimensions are critical.

Yes, everything looks good. It was done in a jig specifically for this conversion, so I'd have to guess it was done right, but I have to wonder. Perhaps I got something wonky ( I was working kinda fast to get everything together) The trailing arms look like they are identical and can go on either side, either way. The A frame assembly can only go one way. I suppose its possible that something slipped when it was being welded, but I need to measure things out and make sure something is off before calling the guy who did the work.

Will

[Nader393]

Huh. How about where the trunnion attaches to the differential? If things were relocated by welding, you’re going to want to make sure everything is squared up. Those dimensions are critical.

[BlackbirdM3]

Check the shims between the trunnion bar ends and the body mounts. Check for correct use of washers and spacers on the differential/trunnion mounting pin.

There aren't any. No space for them either. None came out, none when back in. I'm wondering if the mount might have been welded in the wrong spot.

Will

[Nader393]

In other Alfa news, My car is back on 4 wheels, but the new rear end looks offset to the drivers side. There is far more clearance on the passenger side than there is on the drivers side. I'm not sure why because the old rear end centered perfectly


Will

Check the shims between the trunnion bar ends and the body mounts. Check for correct use of washers and spacers on the differential/trunnion mounting pin.

[BlackbirdM3]

I should start busting all the Alfa Owners balls saying my Datsun got repainted in the Original Alfa Rosso

Except that your paint is metallic, and the original Alfa Red is at best a semi gloss non metallic red.

In other Alfa news, My car is back on 4 wheels, but the new rear end looks offset to the drivers side. There is far more clearance on the passenger side than there is on the drivers side. I'm not sure why because the old rear end centered perfectly


Will

[2mAn]

Everybody loves the bright red #501 "Alfa Rosso" like in Simon's post 1733 above (so do I!), but this dark maroon-red was the original Alfa red on the race cars.

I should start busting all the Alfa Owners balls saying my Datsun got repainted in the Original Alfa Rosso

[LateFan]

The world's oldest running Alfa Romeo race car up for auction...
1921 G1 6C

http://www.roadandtrack.com/car-cult...eo-g1-auction/

Check out that early aero belly pan (or mud guard)
and those rear springs (?! and/or trailing arms?)





Everybody loves the bright red #501 "Alfa Rosso" like in Simon's post 1733 above (so do I!), but this dark maroon-red was the original Alfa red on the race cars.

[LateFan]

[ATTACH]117395[/ATTACH]

[LateFan]

Hey, I just won the Kimberly Cup at Road America in my 69 Alfa Spider. Here it is in the winner circle. And the prize; an engraved bottle of wine.

Outstanding, well done!