Wanted 105 auto Diff - Alfa Romeo Bulletin Board & Forums
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post #1 of 18 (permalink) Old 06-10-2019, 07:11 AM Thread Starter
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105 auto Diff

Hi all , I am looking for a new diff for my 105 Alfa. Currently I have 4.1 ratio but am looking for something around 3.8-1. I have been told that Auto Spiders and Berlinas had these as standard so I guess there could be a lot of these in the US. I know you lot have problems using a " stick shift"
Any info where I could get one also would be gratefully recieved
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post #2 of 18 (permalink) Old 06-10-2019, 08:05 AM
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Hi all , I am looking for a new diff for my 105 Alfa. Currently I have 4.1 ratio but am looking for something around 3.8-1. I have been told that Auto Spiders and Berlinas had these as standard so I guess there could be a lot of these in the US. I know you lot have problems using a " stick shift"
Any info where I could get one also would be gratefully recieved
Good luck. These are unobtanium as production numbers for auto spiders were in the hundreds total. Last one for sale here sold in minutes. It would be really nice if someone would do a reproduction run.

1986 Spider Veloce Turbo

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post #3 of 18 (permalink) Old 06-10-2019, 10:00 AM Thread Starter
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ahh that's not good news then. I got quiet excited when I saw that I had a reply already
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post #4 of 18 (permalink) Old 06-10-2019, 11:15 AM
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I have been told that Auto Spiders and Berlinas had these as standard so I guess there could be a lot of these in the US. I know you lot have problems using a " stick shift"
Your logic is good. But unfortunately, the demographic that found driving a "stick" too challenging also lacked the creativity to chose an Alfa Romeo over a Toyota. So as nealric wrote, not many automatic spiders were sold in the US. I don't believe Alfa was still importing 105 Berlinas or GTV's by the time Alfa offered automatic transmissions.

Jay Mackro
San Juan Capistrano, CA

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post #5 of 18 (permalink) Old 06-10-2019, 11:22 AM
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Interesting, curious as to why?
Pete

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post #6 of 18 (permalink) Old 06-10-2019, 12:46 PM Thread Starter
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Going turbo so not necessary to rev. I am keeping the engine as stock so will have plenty of power low down
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post #7 of 18 (permalink) Old 06-10-2019, 12:51 PM
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Going turbo so not necessary to rev. I am keeping the engine as stock so will have plenty of power low down
You don't really need it for a ~200hp stock motor turbo setup. You'll spin through second on less than ideal pavement, but it's quite manageable overall. I've been looking for one for my planned 300hp build, but I've resigned myself to a life of wheel spin and tire smoke

Other option is a transmission swap. You can do a T5 swap for what it would probably cost to find an auto diff, and there were T5s offered with taller gears. Personally, I decided I wanted to keep things Alfa to the extent possible. If you have unlimited funds, Alfaholics will sell you a direct-swap Quaife sequential box with whatever ratios your heart desires.

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post #8 of 18 (permalink) Old 06-10-2019, 02:45 PM
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Just put a Ford Escort diff in it. So much easier than changing the gearbox. Completely reversible
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post #9 of 18 (permalink) Old 06-11-2019, 05:42 AM
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Just put a Ford Escort diff in it. So much easier than changing the gearbox. Completely reversible
Pete
Interesting suggestion- how direct is the swap? Aren't you also then looking at new brakes, parking brake, suspension attachment points, wheels, and a custom driveshaft? Seems like cost/effort would be comparable to the T5 swap if not greater. Also likely difficult to get a lot of that stuff in the U.S. - the solid axle Escort was never sold here, though I see the OP is in Europe where this isn't so much of an issue.
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post #10 of 18 (permalink) Old 06-12-2019, 11:06 AM
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Auto diffs are out there. I posted here a few years back and eventually a nice race prep'ed one turned up. Just keep bumping your request.
PS - have it behind a v6 converted stepnose. Love it.

Neil
1958 Touring Spider in restoration
1963 Giulia Spider "slightly" abnormale
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post #11 of 18 (permalink) Old 06-14-2019, 05:16 PM
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Not sure if they're still in business but you can try Alfa Parts Exchange (APE) in CA.

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post #12 of 18 (permalink) Old 06-14-2019, 05:18 PM
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Not sure if they're still in business but you can try Alfa Parts Exchange (APE) in CA.



M. Thomas


They are in business and they had one a few months ago. It sold on the BB in about 3.6 minutes.


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post #13 of 18 (permalink) Old 06-16-2019, 04:13 PM
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Perhaps you should extend you search to Australia. There was at one time quite a few Automatic Berlinas running around.
I know my friend Don who was a Flying Tiger’s Flight Engineer exported two automatic transmissions from Sydney. I’m pretty sure he also nabbed a few diffs as well. They went straight into the hold of his 747!
Good luck with your search.
Regards Daniel
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post #14 of 18 (permalink) Old 06-16-2019, 04:29 PM
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Diff

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They are in business and they had one a few months ago. It sold on the BB in about 3.6 minutes.
For several thou!

Richard Jemison
RJR Racing

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post #15 of 18 (permalink) Old 06-16-2019, 05:51 PM
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I just checked. I paid $1200 in 2013 and worth every penny. Back then I had 2 folks offering to sell rear ends.

Neil
1958 Touring Spider in restoration
1963 Giulia Spider "slightly" abnormale
1967 Giulia Sprint GT (aka Stepnose) with 3.0 V6 and a/c
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