Question about Ford F-100

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Transmission vac lines

I got a 73 F100 did some motor upgrades after i got all the lines back on the motor that were needed the two lines from the trany i hooked up, are they both suppose to be on constant vacuum? would that hinder it from shifting down. Or did i hook them up wrong, the truck runs fine other then that.

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  • spcaplette Dec 31, 2008

    thank you for your help, yes i did cam it too I don't think its more then 220 degrees mild edelbrock cam, and carb and intake and also put in a shift kit too!

  • Richard Scordino May 11, 2010

    Been a long time since 73... I think that one goes to manifold vacuum, the other to a fitting above the lower carb butterfly (no vac there 'till you hit the throttle)... even if I'm right, I dont remember which goes where on the modulator. If I could find one of my old chiltons, I'd be able to help better!! Actually the more I think of it, the less I remember seeing two hoses?? Are you sure the modulator is good?? I'm not even going to list this as a solution...Just some ideas...Also as a rule if you put a cam in there with more than 220degrees duration it can cause shift problems.

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Transimission will not go in revirse allother work fine

Posted on Dec 31, 2008

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I recently gave to my 73 mustang mach one automatic ****** service that includes changing the oil and filter, the ****** was previously working ok, but now the trans wont change from first to seco


I don't think it's in your linkage. It sounds like you may have a cracked or disconnected vacuum line leading to your vacuum modulator. Or you may have a fauly modulator. Check for leaks first...At the back of the motor on the passenger side there should be a small (in diameter) vacuum line comming from the carburetor to a metal line leading down and back toward the rear of the car. Then at the back of the trans there should be a small vacuum line leading toward the front of the car to a small metal line. If one or both of those vac lines are loose os broken thats most likley your problem. If not it's more likley the modulator.

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1981 f100 2wd auto rear main oil seal is leaking. How do I get. To it once I back the transmission out is it a 1 piece. Or 2 piece seal


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Ned to now wat the firing order for dist cop shood be for a 1987 ford f100 pick-up truck 300sixcylender stick shift model#333


The F100 ended in 1983, so there is some confusion on your 1987 Ford F100. The F150 started in 1983 and was available in 1987, but not the F100. You have this listed under the 1981 Ford F100 category.
The 300 CID = 4.9L In-Line (Straight) 6-Cylinder.
In order to best answer your question I have included both the 1981 F100 4.9L and 1987 F150 4.9L below. The only difference is with the Distributor Cap Configuration and Connections.

For the 1981 F100 300cid=4.9L:
Firing order:
1-5-3-6-2-4
Cylinders:
(back)
...6
...5
...4
...3
...2
...1
(front)
Distributor:
...(back)
.........4..[.]-clip
2
...................1
6
................5
[.]....3

For the 1987 F150 300cid=4.9L:
Firing Order:
1-5-3-6-2-4
Cylinders:
(back)
..6
..5
..4
..3
..2
..1
(front)
Distributor:
.......(back)
.................4
.....2
[.]
.......................1
..6
.........................[.]-clip
....................5
.......3
.........(front)

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

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1 Answer

Need horn wiring diagram for 73 ford truck f100


Check this diagrams...

599acab.jpg

Fig. 29 Chassis wiring-1973-74 Econoline and Club Wagon



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Fig. 30 Chassis wiring-1973-74 Econoline and Club Wagon (continued)

Hope help with this (remember comment and rated this).

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1 Answer

2003 f150 4x4 don't engage. everything down to the front differential seems to be working


If the test still holds true with the wheels on the ground, I would say it is the vacuum disconnect motor or the vac lines to it. This is on the front axle ( item #10 in the picture below )
a7d42aa.gif

The line w/ vac on it :
Blue - when in 4WD
Pink - when in 2WD

You can use a mighty-vac or other vac pump to test the lines.
Could be as simple as a cracked vac line.

If not, might want to consider the Posilock system for it vs. purchasing the part ( 100+ from Ford new, or poss problem unit from a bone yard ).
This replaces the vac motor, and is a simple cable to the ear from the front diff. This is just a thought if the vac motor is verified as non operational.

Start off with the vac test on the motor, and see what the next step should be ( repair vac lines or new vac motor / vac solenoids ).

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Need vacuum diagram for 73 f100 w/ 302 thanks


give the websites a try its www.alldatadiy.com and www.autozone.com if all fail stop by your local library and get your hands on a Haynes auto repair manual for your truck wish you the best of luck Michigan

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2 Answers

Transmission for a 1978 Ford F100


The transmission should have the label "FMX" upon the center lower drivers side of the body. This was Ford's largest and heaviest tranny they ever made for commercial(privately owned) trucks.They only produced this model for 8 years.

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2 Answers

Transfer case wont engage


shift into 4wd and move truck a couple of feet.
if light is still off, park truck block the wheels set the park brake jack right front wheel and try to hand spin the wheel if wheel doesn't turn 4x4 is functioning properly but there is a wiring problem use an ohmmeter to check the 4x4 switch wiring fuse and bulb
if wheel turns freely the front axle or transfer case is not engaged
attempt to hand spin the front driveshft if the driveshaft will spin the transfer case is not engaged check the transfer case shift linkage, problem is in linkage or transfer case internals
if the driveshaft will not spin the transfer case is engaged properly
with trnsmission in neutral or park start engine measure vacuum on the two vac lines at front axle shift motor . one line should have approx 20" vacuum. other line should have none
if no vacuum measured look for vac leak or bad vac switch
if both lines have vac look for a bad vac swithc or ruptured cad actuator diaphragm
if one line has 20" +- VAC
move transfer case lever to 2wd measure vac again lines should have swapped vac signals
if no vac switch bad or 4wd shift likage needs adjusting
if yes vac motor bad or stuck or shift fork stuck
remove vac shift motor from the axle attach vac lines to shift motor engage disengage 4wd
does shift motor plunger move at least 1/2 inch
no shift motor bad
yes check axle shift fork and vac motor for binging

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