Valve Bodies, Valves, and Shift Kits

GM Mechanical Modulator (Designed for TH400 Swaps from 700R4 on 6.2L Diesels)

SKU# 40MThe Fitzall Mechanical Modulator is designed to take the place of the vacuum modulator on all 700-R4 to 400 6.2L diesel switch-overs.

TH350 TH400 TH250C Modulator (1965-UP) Red Stripe

This is a high quality GM Turbo 350 and Turbo 400 modulator without gas EGR and adjustable 12-15 pounds.   Rostra # 51-0062