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There were two types of axle fitted to the PV, the ENV, and the spicer. The ENV axle has its diff fitted from the front. The spicer had its diff fitted from the back. The Spicer requires an axle casing spreader.
For the Spicer there was a limited slip diff available.
Two ratios were available for both axles, 4.56 and 4.10, most PV's seem to have low ratio axles, but both ratios were listed. There is no such thing as early and late, the ENV and Spicer were used interchangeably, but very late PV's all have Spicer axles. It is not the case that early ones have ENV's Volvo were using two suppliers.
The axles from 120's, and 1800's don't just bolt on. They lack the mounting for the torque rods on the top of the banjo housing. The diff however can be used out of those axles. Overdrive 120's and P1800's used the 4.56 diff, but they will pull a 4.10 easily for more relaxed cruising. An overdrive in a PV is nice but it won't fit the tunnel without alteration.
For the Spicer axle there are other ratios available since the same basic design was used in Jeeps.
Regards
Pete
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