Vacuum Adjustment - Gen 1 300SD

[Mahone Bay]

Hello All,

Apologies for the English, this is too much text for my limited Dutch.

Having spent hours trolling through volumes to e-mail threads and countless attachments I believe I have been able to consolidate the critical information necessary to properly adjust the quality of gear change points on the 722.3 and 722.4 transmissions. The attached PDF covers the following major topics;

1. Vacuum Control Valve (VCV) Adjustment

2. Vacuum Modulator Pressure Adjustment

3. New Style Vacuum Modulator (P/N 126 270 30 89)

I have also included some related topics that should help with smoother shifting.

All the procedures used in this document have been performed on my own car (1981 300SD). The pictures were made as I went along. PLEASE share any feedback you may have especially if you find errors or have additional information. I will attempt to keep the document up to date with your feedback as well as my future activities in this area.

Hope it helps.

Take care,