75 auto LSD - can it be transplanted into a 5 speed box?

Started by Divano Veloce, January 22, 2024, 02:04:33 PM

Previous topic - Next topic

Divano Veloce

Can the LSD from a 75 Auto be used in a manual box?

Thanks!
1968 Berlina TS
1989 75 TS
1990 75 TS
2007 147 JTD

MD

It's a transaxle. The LSD component is just part of the final drive. I cannot imagine that Alfa would go to the extent to specify something different for such a low volume seller other than use what is generically available.
The automatic part is in the gearbox but the final drive should be generic.
Transaxle Alfas Haul More Arse.

Current Fleet
Alfetta GTV6 3.0
Alfetta GTV Twin Spark supercharged racer
75 1.8L supercharged racer

Past Fleet
Alfa GT 3.2V6
Alfetta GTV 2.0
Giulia Super 2.0
Berlina 2.0

LukeC

I am pretty sure they are different. I have 105, 116 and a centre sourced from an Auto Alfetta (same as a 75 box) here in the workshop. I am pretty sure the centre of the Auto Transaxle is the same as a 105.

I would have to double check though...
Luke Clayton

qvae.com.au

LukeC

OK... I was: that W word!  :o

They appear to be compatible.
Luke Clayton

qvae.com.au

Divano Veloce

Thank you Gents!

I will pull it out and report back... if i can make a "TS" out of these bits its a win!
1968 Berlina TS
1989 75 TS
1990 75 TS
2007 147 JTD

MD

Transaxle Alfas Haul More Arse.

Current Fleet
Alfetta GTV6 3.0
Alfetta GTV Twin Spark supercharged racer
75 1.8L supercharged racer

Past Fleet
Alfa GT 3.2V6
Alfetta GTV 2.0
Giulia Super 2.0
Berlina 2.0

aggie57

Yes, you can make it work but it's not a straight bolt in.  Several of us did it many years ago using LSD centres from automatic Berlina's in GTV6's.  As I recall there was a spacer needed on one side of the LSD, and the stub axles in manual boxes had a different diameter on the spline than the LSD so we needed to source some parts to sort that out.  Vin Sharp set mine up and machined up the spacer.  Excellent outcome though, well worth it.
Alister
14 Alfa's since 1977. 
Currently 1973 GTV 2000, 2020 911 C2S MT, 2021 Mercedes GLE350, 2023 Polestar 2 LRDM
Gone......far too many to list

Divano Veloce

The 75 Auto box does indeed contain an LSD, but it is NOT compatible with a V6 manual 4.1:1 CW/P

The V6 Auto LSD diff carrier has a 10 bolt CW
The 4.1:1 V6 manual open diff carrier has an 8 bolt CW.

The spigot diameters are different too.

As the automatic pinion rotates in the opposite direction to the manual, the differential is removed from the LHS of the transaxle and the teeth are cut in the opposite direction.

Also, the pinion head is "between bearings". Tough box!
1968 Berlina TS
1989 75 TS
1990 75 TS
2007 147 JTD