MY TURBO 400 LEAKS RIGHT WHERE THE SPEEDOMETER CABLE GOES INTO THE TAIL SHAFT.IT LEAKS PRETTY GOOD.DOES ANYONE KNOW IF THEIR IS SOME KIND OF SEAL OR SOMETHING TO REPLACE.MAYBE ITS LEAKING AROUND THE THREADS THAT THE SPEEDOMETER SCREWS ON TO?
I also had a leaky turbo 400. it has been a few years since I went into vapor lock because I could not completely locate all of the leaks. I did the speedo o rings and and a several attempts at the pan gasket. I threw out a perfectly good chrome pan, thinking it was the cause. I ended up replacing a seal where the shift rod exits the trans. Wha-La that dried it up real nice. the only bummer is that you have to do this from inside. hopefully its only your speedo seals! An easy, fast, and cheap repair.
*Mike* The Proud daddy partner of a 76 GMC 2WD Long-Bed (my kids truck)
I WILL CHECK THE VENT TUBE.I JUST CHANGED THE FLUID AND FILTER LAST NIGHT.I HAVE A NEW PAN GASKET SO THAT LEAK IS FIXED.I STILL NEED TO FIX THE LEAK AT THE SPEEDO CABLE.DOES ANYONE KNOW IF THE FILTER IN A TURBO 400 KIND OF FLOATS.I MEAN THAT THE BOLT THAT HOLDS THE FILTER ON CAN ONLY GO SO TIGHT BY THE WAY THE BOLT IS MADE.THE FILTER SEEMED TO SIT LEVEL BUT IT KIND OF MOVES AROUND.THIS IS MY FIRST TURBO 400,SO I'VE GOT SOME THINGS TO LEARN.