Shifting Blues...
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Freshman User
Joined: Jan 2006
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From: Attleboro, MA
Shifting Blues...
hey, SOS, Ready to drive down to the gas station except I can't get the tranny to shift into drive/3. As far as I can tell, it's a 1971-2 C4. Changed mod. valve, that got it to shift once, need a second shift. I think the shifter rod hits the exhaust pipe if i was to manually shift down to low/1 but it goes into drive nicely. should upshift twice into drive/3 based on vacuum...if I remember correctly. Would not enough vacuum let it shift once but not a second time? out of my league. mated to '65 289. I did keep the vacuum wipers, don't plan to use them much, (running home in the rain). Asking for help/suggestions/experience. Thanks guys.
Post Fiend
Joined: Mar 2007
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From: springfield il
did it sit long not being run ? c-4's { dont remember 'bout the c-6 } have a tendency to have "valves" 
stick and become non op requiring at the minimum you taking the panoff and taking things apart and cleaning some up .
stick and become non op requiring at the minimum you taking the panoff and taking things apart and cleaning some up .
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Freshman User
Joined: Jan 2006
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From: Attleboro, MA
yes, it was in a junkyard. could have sat a long time. the mod valve just about rusted out...why I changed it among other practical reasons. Do you know about a ball and spring that is held in place by the filter? what is its function? Any way to flush a tranny and then replace the fluid? i am told it takes type F. being that old. thanks
Post Fiend
Joined: Mar 2007
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From: springfield il
no idea on the ball and spring , i got a cousin who used to hang around here that iquiz when im not sure . he worked at allstate trans for years . yes on the type f . maybe one of the others will have a clue . it may sound simplistic but i lay things out as they came out and unless otherwise told put it back in when it comes to the mysterious inner workings of an auto tranny .
Elder User
Joined: Jul 2006
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From: Athens, GA, USA
I found something interesting with my C4 with a floor shift. A normal auto transmission shift pattern is P-R-N-D3-D2-L right? With my C4 it's P-R-N-D(high 2nd and 3rd only)-D (1st, 2nd, 3rd) and Low. I vaguely remember seeing something to that effect when I was 16 driving a 66 Mustang with "Cruise-O-Matic" automatic transmission (C4) on the shifter, but my mind is a little fuzzy. That was 25 years ago. At any rate, if I shift it one notch past what I would normally think is Drive, it runs and shifts great through all of the gearing. I may be off the deep end in my explaination, but it works for my truck.
As for vacuum for shifting, if you have enough for one shift, you have enough for two.
As for vacuum for shifting, if you have enough for one shift, you have enough for two.
Last edited by doug51f1; Dec 6, 2007 at 03:39 PM. Reason: more info
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Freshman User
Joined: Jan 2006
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From: Attleboro, MA
Thanks. I'll try different position. I assumed the same as you... that it is P-R-N-D-2-1
I tend not to be surprised at anything anymore.
To 55 F350: I didn't know it was there. just dropped when I took out the old filter. I'm with you, it its tranny related... leave it alone. I 've had my debacles in the past. Transmissions are a specialty- not my specialty. : )
51 Ford F1
I tend not to be surprised at anything anymore.
To 55 F350: I didn't know it was there. just dropped when I took out the old filter. I'm with you, it its tranny related... leave it alone. I 've had my debacles in the past. Transmissions are a specialty- not my specialty. : )
51 Ford F1
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I know this is a dumb questions, but I have seen it happen several times. When you changed the modulator valve...did you make sure the little pin behind it did not fall out?
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Freshman User
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From: Attleboro, MA
There are no dumb questions. yes, I did make sure the pin is there. Originally I assumed the tranny was from 1965, same as engine. found out not true. appears to be be a 71-2
takes a threaded m-valve. and the filter I bought for a 65 c4 didn't fit. missing a little tab that holds in the ball and spring. learning every day.
takes a threaded m-valve. and the filter I bought for a 65 c4 didn't fit. missing a little tab that holds in the ball and spring. learning every day.
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From: Rio Rancho, NM
I don't know when the changed the shift patter on the C4's to the modern P-R-N-D-2-1 but my 1965 Falcon has a C4 Cruise-O-Matic and the shift pattern is P-R-N-2-D-1
which means that if you put the car in the gear that you would normally think is Drive it is acutally manual 2nd.
Bobby
which means that if you put the car in the gear that you would normally think is Drive it is acutally manual 2nd.
Bobby
Elder User
Joined: Jul 2006
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From: Athens, GA, USA
Originally Posted by bobbytnm
I don't know when the changed the shift patter on the C4's to the modern P-R-N-D-2-1 but my 1965 Falcon has a C4 Cruise-O-Matic and the shift pattern is P-R-N-2-D-1
which means that if you put the car in the gear that you would normally think is Drive it is acutally manual 2nd.
Bobby
which means that if you put the car in the gear that you would normally think is Drive it is acutally manual 2nd.
Bobby
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Freshman User
Joined: Jan 2006
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From: Attleboro, MA
Next time out, I'll try the next shifter position, that would be a quick fix. and that explains it only shifting once. Thanks for the help.
Never too old to learn. Ralph
51 F1
76 TR6
71 Triumph Bonneville
Never too old to learn. Ralph
51 F1
76 TR6
71 Triumph Bonneville
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Joined: Nov 2007
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From: Azle, Texas
The Governor is what makes it upshift, the modulator just controls the shift(from shifting too soon). When the governor pressure over comes the mod. pressure it upshifts. Your governor may be sticking or have a bad hyd. leak. Another thing I've come across is people not gounding the engine properly. The engine then grounds itself thru the driveshaft, this can cause the governor not to work by magnetising the governor. First make sure you have a good clean ground going from the engine to the frame(make sure its clean also), then from the frame to the battery. Try driving it again. If its not a ground problem, you'll need to remove the tailhousing. That thing with the four bolts holding it on is the governor. Remove it and make sure the weights are moving freely. Reinstall and try driving again. If that doesn't fix it then you may have a hyd. leak, which you will need to have a tranny shop look at.
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From: Attleboro, MA
Thanks Redpanhead. There are many things i overlook in building this truck back up. Maybe the ground is one of them. If not, i'll take apart the gov. first time for everything.
FYI, I made the drive shaft, rear from original 51-welded to the front of the tranny driveshaft. temp. til I can have one made. As far as I know this would only cause some balancing vibration. ?? I think the answer is usually simple, overlooked or not remembered. Thanks again for the sound suggestions.
51 Ford f1
FYI, I made the drive shaft, rear from original 51-welded to the front of the tranny driveshaft. temp. til I can have one made. As far as I know this would only cause some balancing vibration. ?? I think the answer is usually simple, overlooked or not remembered. Thanks again for the sound suggestions.
51 Ford f1
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On my 65 Mustang with a c4 auto, it has what a lot of Mustang people call the green dot selector on floor shifter. In other words, when you go from neutral to D,(one notch back, it takes off in 2nd and then shifts to 3rd and thats it. If you put it back 2 notches from N, it takes off in 1st and shifts twice. On a side note, if the same tranny is put in a column shift auto, then the linkage inside the tranny to valve body has to be "turned over". I did this once when put a tranny from a falcon to a 66 conv that I had.
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Freshman User
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From: Attleboro, MA
Thanks. right now I'm trying to remember that 65 Galaxie that donated the tranny. I think it was a column shift. I have it on the column. if galaxie is still at junkyard, I will find out. that was a few years ago. Thanks for the tip.
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