For sale a Detroit Truetrac LSD for the Dana 30 differential that has a gear ratio of 3.73 and up (3.73, 4.11, 4.56 etc) £300 plus postage for the diff, they sell for over £500 in the UK. The one pictured I imported from the US and is brand new.
The following models should have the Dana 30 to fit this LSD: 1800E/ES 1970-73. the 140 from 1967-end 1974, and the 240 series to around 1980. But please check for yourself as I am not an expert on old Volvos.
This is a link to the manufacture’s website:
http://www.eaton.com/EatonCom/Produc...troitTruetrac/