Hits 2nd harder than 3rd...

[nikon4u]

I just put in a new modulator and now when it goes into 2nd gear, it seems to hit kind of hard. but it seems to go into 3rd normal.

[Heavenlyfire]

I don't know a lot about auto trannys, but I was having a similar issue and took it in. All they did was adjust the belts - bands - whatever they are called. I had one that was too loose.

[nikon4u]

How exactly do I adj the trans bands on a MX?

[fordman]

in general there should be a bolt with a nut around it on the side of the transmission. the bolt should be turned in to a certain point and then brought out just so far and then the nut tightened back down to hold the bolt in place.

[Leadfoot]

Adjusting the bands really should be left to some one that knows what they are doing, for you can cause major problems Ie. Two gears at once and a trans explosion. trust me. Its Just Not Worth the risk!

And I think the band adjustments in a fxm are in side you need to remove the pan.
I Dis like these trans allot I would Get A C-6.

[1970F250]

when my c6 shifts into 2nd it kicks pretty good. are you sure it isnt just like that?

[QC]

I think most modulators are adjustable. If you take the vacuum hose off there is a screw inside there.

[nikon4u]

which way do you turn it to make it shift sooner?

[binder56jd]

some of the modulators are adjustable but i think it is fairly common for the 1st to 2nd shift to be more pronounced than the 2nd to 3rd- within reason of course- i've got an old borg-warner in a travelall that acts like that- all the transmission guys said it's typical-jd

[binder56jd]

11. What does the vacuum modulator do?
12. Is there a right way or a wrong way to hook up my vacuum modulator?
13. Are there any adjustments that can be made to the modulator?

What does the vacuum modulator do?

Answer: The vacuum modulator is a canister that contains a diaphragm and a calibrated spring. The diaphragm senses changes in engine vacuum due to throttle position/load changes and transfers the diaphragm motion to the modulator valve in the transmission. The calibrated spring opposes the diaphragm movement. This provides the means for the transmission to adjust internal pressures based upon torque demand by the engine.



Is there a right way or a wrong way to hook up my vacuum modulator?

Answer: Since the transmission is so dependent upon the modulator to function properly, a good vacuum signal must be transferred from the intake manifold down to the modulator. The best way to insure this is to utilize hard steel line to carry the vacuum signal with approximately three inches (maximum) of rubber hose on each end for the connections. This setup will prevent the hose from cracking or burning in areas that are close to the exhaust system and will also reduce the chances of the hose collapsing onto itself. Most modulators require a minimum of 15 inches of Hg (Mercury) at idle to function properly.



Are there any adjustments that can be made to the modulator?

Answer: Stock factory modulators are pre-set and most are sealed. TCI® StreetFighter® modulator-type transmissions are all equipped with adjustable modulators. By turning the adjusting screw (found in the vacuum nipple) counterclockwise, you will lower the spring pre-load. This will cause earlier shifts. By turning the adjusting screw clockwise and raising the spring pre-load, the shift points will go up. The range of adjustability is only a few mph either way.

[fordman]

that is really clear and informative. seriously

[binder56jd]

all i can take credit for is finding it on the net- for more and there was some very good more go to
http://www.tciauto.com/tech_info/faq.htm#13

jd

[Jake11]

Take off the vac hose at the modulator. look in the fitting. see the slot
? A little screwdriver will work. I use a pocket screwdriver ground down
to fit. If it bangs to hard, turn the screw 1/2 a turn at a time,to the left and drive it a while to see if you like it. Keep track how much you turned the screw so you can put it back if you went to far. Good luck, KP

[fordman]

jake will that work on aod's? like my 94?

[Jake11]

No!! AOD uses a throttle cable, and the newer ones have electronic setup.No modulator. If yours has the cable and you start messin with it,
you can toast the tranny in a day or two. It is adustable, but I would read
up on it and follow the manuel. The AOD is a pretty good tranny. They
usually shift pretty smooth. When they get old, the valves start to stick
in the vave body. Then they start to shift funny. Try changing the fluid and
filter. Thats what I would try first and see how it goes.