I just pulled apart a 1987 722.317 transmission and noticed that the reverse piston springs are much lighter than the ones in the 1991 350SDL 722.361. I had to use two large clamps to compress the springs in the 1991. In the 1987, I was able to compress them using my hands alone. So I will indeed only use half the springs with the 1991 reverse piston for firmer reverse engagement and less slipping of the discs.

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles