901 ZF LSD rebuild, 30 years of parts collecting pays off Options

[mgphoto]

Hello,
I started collecting parts of this project 30 years ago and the last parts have fallen into place.

In this post I hope to clear up some confusion and convey some of what I found trying to complete this project.

First piece


purchased form PAR in Yonkers NY 1986 914.332.209.00 casting number 51D

The LSD found its way to me in 2013 from the venerable Cap'n Krusty



The diff needed some work as it was missing internal spring plates which are NLA.

Item number 4 in this factory illustration.
This part places tension on the clutch pack which is measured as drag.
The factory spec on this is 29 - 58 ft. lbs

This item can be replaced by what is now called a "cup" spring from and early 928
part no. 928.332.555.00

seen here as item number 10

As for the internal wear parts, the 914 parts are NLA but, get this they are replaced by mostly 917 parts! WAY COOL.

Just the beginning, stay tuned!
Mike

[oldie914]

The 901 332 209 21 flange was used for the early 1969 model year 911/912 with an aluminum case transmission. In the middle of the 1969 model year, Porsche changed to the magnesium case transmission and the axle flange used was 901 332 209 22.
The aluminum case transmissions used an inch size differential carrier bearing with an ID of about 43.xx mm. The magnesium case used a metric size bearing with a 50mm ID. In addition, the magnesium case differential carrier carrier is 11mm wider than for the AL case. (120mm vs 109mm)
Also, the distance between the axle flange faces was the same (260mm) for both the AL and magnesium case transmissions which allowed the transmissions to be switched with no changes to the axles.
The 901 332 209 21 flange has a total length of 110mm. The end that fits into the differential is 57mm long and and 34mm diameter.
The 901 332 209 22 flange is 105mm long. The differential end is 57mm long and 35mm diameter.