Further you put your foot down, the more it moves the modulator valve inside the gearbox, just the same result as with a vacuum cansiter but done with cable and levers. Ron Sessions' book on the TH400 mentions one made by B+M called the "Modulink", have a google of that. I would imagine Summit or the likes would keep stuff like that also.
The TH400, or Turbo 400, transmission was a 3 speed automatic that was first produced in 1964. This transmission became well-known for its strength and was very popular, based on its life and the number of applications in which it was installed. It was not only used in General Motors applications, but was also used for many luxury cars. Early 1967 Chevelle TH400 oil pans had a unique heel mark, a bump, and 3 dimples. According to a Chevrolet Service News Bulletin around July of 1967 saw a change in the TH400 oil pan; the heel mark, bump, and 1 of the dimples was gone. th400 kickdown switch Prop 65 Warning This product can expose you to chemicals including lead and di(2-ethylhexyl)phthalate, which are known to the State of California to cause cancer, birth defects or other reproductive harm.
th350 troubleshooting chart, The old standby for many years, our TH350 transmissions are a great value whether for a street machine or street rod. Able to handle a maximum of 450 horsepower, all our TH350's come with improved shift characteristics, added clutches and superior assembly. The vacuum modulator is connected to the hose and it is free from leaks, is getting vacuum and appears to be fine. The fluid level is correct as well. At the point it stopped shiffting I was coming up to highway speed and stepped fully onto the accelerator pedal engaging the passing gear. Install: B&M Vacuum Modulator for GM TH350 & TH400 Automatic Transmissions 20234. Please subscribe to our DEclips ...
Does the actual modulator leak or does the seal behind it leak normally? Jill's is leaking and it appears you have to buy the whole modualtor to get the... The modulators are the same for the TH350 and 400 trannies. Usually they have a red stripe on the one you want... ps, nice looker Dana!K24 To Th400 Adapter. K24 subaru swap. Buy and sell in less than 30 sec, anytime, anywhere. Tranny notes I have put together:1) 01-06 accord euro-r and 05-06 rsx-s ... TH400, 3L80 # 36602. Modulator (2.44 sq in Diaphragm) Adjustable Low Vacuum. MODULATOR (LOW VACUUM) T350/400. Type of Product: Modulators. Qty Needed: 1. Years: 64-ON.