I just installed a 4T60 in my 3.4pr. My vacuum is connected at the manifold and I've switched my modulator to the MD-28 from the turbo GP because I have a turbo. The TV cable has been adjusted from min. to max. and I still don't have it shifting correctly. It seems to hold gears too long, if I back off the gas at 3k it will shift if not it will go to 3-1/2 or higher before it will shift on its own. My car does have a cam and vacuum is a little low at 10 and only goes down from there. Any idea what's going on here?
mine did that too. My cable was old and was not adjusting "automatically" the way it should so I did some manual adj and same as you shifts were late. installed a new cable and adjusted and now is shifting correctly. Although to kick down to passing gear pretty much have to floor it with a fast motion. slowly going to the floor won't engage it. Part is probably old technology but also wondering since I T'd mine off that port beside the throttle body if it doesn't like sharing vacuum. Which in a way is what you're wondering if there isn't quite enough vacuum.
------------------ 1986 Fiero GT Fastback 3.4Lpr with 4T60 1979 Naked Honda Goldwing - sold 1983 Honda Goldwing 1100 Interstate
Gov is shaft to drive VSS. Is trans for a van etc? Then likely need a trans shop to recal the gov'r. Can try DIY cleaning the gov that but if you bend springs etc then need a shop to fix it.
------------------ Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should. (Jurassic Park)
I don't think it's the neutral safety switch that's my problem. The car won't start in neutral, and reverse lights come on in reverse, the problem is when the car is in reverse the shifter is in N and when the car is in drive the shifter is between 1 and 2. My throw is off due to the fact I needed to modify the cable bracket to avoid the turbo that sits right above the transmission, in doing that I needed to add an inch to the arm that comes out of the transmission through the neutral switch. By adding the inch it increases the travel thus making the selector inaccurate. I don't think there is anything that can be done to correct this except move the turbo and position the cable back to its original location.
The indicator can be adjusted (somewhat) by adjusting the position of the shifter in the console. The holes in the shifter bracket are elongated.
The fiero shifter has the detents for the four speed auto. It is critical to transmission longevity to have the proper length arm on the transmission gear select shaft so that the detents inside the trans coincide with the shifter detents. If the arm is the wrong length, the spool valve inside the trans shift body will not stop in the proper positions for range selection.
The indicator can be adjusted (somewhat) by adjusting the position of the shifter in the console. The holes in the shifter bracket are elongate.
When I first tried to setup the shifter in neutral park would not engage, so I started with the transmission in park and the selector in P. If I make make the adjustment at the shifter I might lose park again, but I won't know till I try.
Detent cable and vacuum issues are solved, car shifts smooth up and down. My only issue now is the alignment of the shifter. Park is perfect reverse is N and drive is 2/1.
Yep the angle of the retangle that goes on the shifter post is really important. wonder how I know???
Yes I also found that out.. The one from the Fiero is incorrect, I have the correct one but when you extend the length by 1" it needs to travel further to move the center pin the same distance. Same principle as a larger wheel and a speedometer.
