Modulator valve leaks are very common on the TH400. Fortunately, they are also very simple to repair. Check it out! For more content visit: burnoutsandrotorblades burnoutsandrotorblades
I had the same leak on my c3 corvette and replaced to o ring, but it still leaked a little. So, I slipped another o ring on it just above the first o ring and slid it up to the ridge that the bracket holds in. Problem solved. If yours is still leaking you might want to try that. 🖖🏻
hey, appreciate your video... I have a 84 cucv m1009 and it pretty much shifts too late from 1st to 2nd... what would you recommend to get it fixed? should I either replace the valve @ the injectionpump upwards or "decrease the screw" at the modulator? ... thanks in advance for your advice ;-) best regards from germany
I've been battling this same thing in mine. it just shifts too hard and late. I am looking through vacuum leaks and adjusting the valve to get it right. Make sure you dont have any vacuum leaks because that will make the modulator ineffective and you'll have a hard 1-2 shift at high RPM.
I have a question I have a 1978 C10 half ton I can run through all the gears after shifter it's an automatic I can see it switching the gears on the transmission but the truck won't move is this something with the transmission or something to do with shifting in the column can you help me out please
