tranny issues....
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just another Rockwell looser
Joined: Feb 2003
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From: Cocoa, FL
tranny issues....
this is prob. not the right forum for this,....but i dont care, this is the only one i go to....so....PIRATE SALUTE!!!!....haha
ok, after letting my bronco (78' bronco, 408,c6,205,etc etc.) sit for a while when i was changeing the power steering pump, i finally took it out driving again today, but for some reason i couldn't get it to go into 3rd gear, im under the impression that it has a manual valve body, (b/c you can put it in "D" and it will stay in first gear since ive owned it.) so shift it on the column 1st, 2nd, and shift to "D" for 3rd, today it wouldn't go no matter what i tried, it has always acted up a little, but usually when i would put in to 3rd and it wouldn't want to shift i would just down shift back to 2nd then back to "D" or 3rd and it would shift, today it wouldn't go into 3rd at all.
im not up to par on tranny's at all, so bare with me, is the c6 in my bronco run/shift off vacuum? i noticed also today that the engine was idleing at a little higher rpm's, it wasn't loping as hard....so i was thinking maybe vacuum leak?
or what? comments? advice? bacon?
Nick
ok, after letting my bronco (78' bronco, 408,c6,205,etc etc.) sit for a while when i was changeing the power steering pump, i finally took it out driving again today, but for some reason i couldn't get it to go into 3rd gear, im under the impression that it has a manual valve body, (b/c you can put it in "D" and it will stay in first gear since ive owned it.) so shift it on the column 1st, 2nd, and shift to "D" for 3rd, today it wouldn't go no matter what i tried, it has always acted up a little, but usually when i would put in to 3rd and it wouldn't want to shift i would just down shift back to 2nd then back to "D" or 3rd and it would shift, today it wouldn't go into 3rd at all.
im not up to par on tranny's at all, so bare with me, is the c6 in my bronco run/shift off vacuum? i noticed also today that the engine was idleing at a little higher rpm's, it wasn't loping as hard....so i was thinking maybe vacuum leak?
or what? comments? advice? bacon?
Nick
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just another Rockwell looser
Joined: Feb 2003
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From: Cocoa, FL
the shift from 2nd to 3rd also feels loose/mushy not like shifting into 2nd....ive checked to see if it shifts into all gears at home with it not running and the transmission clicks through all gears.....so i dont know....
is the "mushyness" in the column or the transmission somehow....
is the "mushyness" in the column or the transmission somehow....
Post Fiend
Joined: Jul 2006
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If you do have a manual valve body and you put it in "D" then the truck would take off in 3rd, not first. The same is true for second gear, it would take off in second.
When in drive, does the trans shift at all by itself?
This trans is originally vacuum operated, but would no longer be if it truly has a manual valve body.
There is a possibility that you do not have a manual valve body, and have simply been driving it around with a bad vacuum leak, or bad vacuum modulator the whole time, and now since it has been sitting, the leak has become worse, and it is acting up on you. Could explain the soft shifts. How is the level? C6 screens can often clog and have an effect on pressure. Does it pull well, or does it feel like it slips?
When in drive, does the trans shift at all by itself?
This trans is originally vacuum operated, but would no longer be if it truly has a manual valve body.
There is a possibility that you do not have a manual valve body, and have simply been driving it around with a bad vacuum leak, or bad vacuum modulator the whole time, and now since it has been sitting, the leak has become worse, and it is acting up on you. Could explain the soft shifts. How is the level? C6 screens can often clog and have an effect on pressure. Does it pull well, or does it feel like it slips?
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just another Rockwell looser
Joined: Feb 2003
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From: Cocoa, FL
Originally Posted by 75F350
If you do have a manual valve body and you put it in "D" then the truck would take off in 3rd, not first. The same is true for second gear, it would take off in second.
When in drive, does the trans shift at all by itself?
This trans is originally vacuum operated, but would no longer be if it truly has a manual valve body.
There is a possibility that you do not have a manual valve body, and have simply been driving it around with a bad vacuum leak, or bad vacuum modulator the whole time, and now since it has been sitting, the leak has become worse, and it is acting up on you. Could explain the soft shifts. How is the level? C6 screens can often clog and have an effect on pressure. Does it pull well, or does it feel like it slips?
When in drive, does the trans shift at all by itself?
This trans is originally vacuum operated, but would no longer be if it truly has a manual valve body.
There is a possibility that you do not have a manual valve body, and have simply been driving it around with a bad vacuum leak, or bad vacuum modulator the whole time, and now since it has been sitting, the leak has become worse, and it is acting up on you. Could explain the soft shifts. How is the level? C6 screens can often clog and have an effect on pressure. Does it pull well, or does it feel like it slips?
fluid level is good and clean fluid. drive it kinda feels different but 1st and 2nd are solid as a rock and when i shift to 2nd from 1st it kicks like a mule...where does the vacuum line go into the tranny?
a vacuum leak would make it idle higher right? b/c of it running lean....?
Post Fiend
Joined: Jul 2006
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IS "D" low gear, 2nd being second, and 1 on the shift indicator actually 3rd gear? This would indicate a reverse pattern valve body, and then the vacuum line connected to the vacuum modulator should no longer have anything to do with shifting the trans. But if there is a hose on the modulator, and it is leaking, this will probably be where a leak has ocured, and a lean condition will cause the high idle.
What happens when you put the shifter all the way down to low, or 1st? Is that no longer 1st gear?
Sounds like you have some trash or contamination in the valve body preventing the high gear. C6's only have a screen and not a filter, so the screen only catches larger particles and not the smaller stuff. Real common for then to stick vavlves and other valve body related components, especially after thay have been sitting.
What happens when you put the shifter all the way down to low, or 1st? Is that no longer 1st gear?
Sounds like you have some trash or contamination in the valve body preventing the high gear. C6's only have a screen and not a filter, so the screen only catches larger particles and not the smaller stuff. Real common for then to stick vavlves and other valve body related components, especially after thay have been sitting.
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just another Rockwell looser
Joined: Feb 2003
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From: Cocoa, FL
If I put it in 1, it will be and stay in 1st gear, same with 2, stays in 2nd gear, but in “D” at a dead stop, if I put it in “D” it will be in 1st, but start driving and it will stay there.
If I start in 1 then shift to 2 then shift to “D” it wont shift, it will stay in 2nd gear. Usually b4 it sat for a while when I shifted to “D” and it wouldn’t shift, I would just go back to 2 then back to “D” then it would shift into 3rd most of the time.
Im thinking that I don’t have a manual valve body judging by what I just said, im thinking vacuum leak, at least that’s what im hoping
Where does the vacuum line go into the tranny at? To fix this just replace the entire line? Is it just reg. say rubber gas line or something or is it made of something special, sorry for the last few dumb questions, I havnt looked for the vacuum line yet….
If its not the vacuum line and is the trash in the valve body as you suggested, is that something that can be easily fixed in truck without digging into my c6 to much?
Thanks,
Nick
If I start in 1 then shift to 2 then shift to “D” it wont shift, it will stay in 2nd gear. Usually b4 it sat for a while when I shifted to “D” and it wouldn’t shift, I would just go back to 2 then back to “D” then it would shift into 3rd most of the time.
Im thinking that I don’t have a manual valve body judging by what I just said, im thinking vacuum leak, at least that’s what im hoping
Where does the vacuum line go into the tranny at? To fix this just replace the entire line? Is it just reg. say rubber gas line or something or is it made of something special, sorry for the last few dumb questions, I havnt looked for the vacuum line yet….
If its not the vacuum line and is the trash in the valve body as you suggested, is that something that can be easily fixed in truck without digging into my c6 to much?
Thanks,
Nick
Post Fiend
Joined: May 2004
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From: St George, SC I-95
Quad,
If you have a manual valve body 1st will be 1st 2nd will be 2nd and D will be 3rd. If its a manual and you put it in D it will be in 3rd never 1st. Im sure it has some type of shift kit but it seems like its shifting normally...ie...1st is 1st and D is 1st until you get to speed and need 2nd then 3rd. If it were me Id check the line because could be a vaccum leak but thats not something that just "happens." If its not clogged or disconnected Id drop the pan (17 bolts I think) change the filter and pull the valve body out. Its no big deal to do even with the tranny in the truck. Id blow the valve body out with some air and reinstall. I bet there is a small piece of grit stuck behind one of the little ***** that regulate the pressue and make the tranny shift.
If you have a manual valve body 1st will be 1st 2nd will be 2nd and D will be 3rd. If its a manual and you put it in D it will be in 3rd never 1st. Im sure it has some type of shift kit but it seems like its shifting normally...ie...1st is 1st and D is 1st until you get to speed and need 2nd then 3rd. If it were me Id check the line because could be a vaccum leak but thats not something that just "happens." If its not clogged or disconnected Id drop the pan (17 bolts I think) change the filter and pull the valve body out. Its no big deal to do even with the tranny in the truck. Id blow the valve body out with some air and reinstall. I bet there is a small piece of grit stuck behind one of the little ***** that regulate the pressue and make the tranny shift.
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just another Rockwell looser
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From: Cocoa, FL
Originally Posted by STGFordCrazy04
Quad,
If you have a manual valve body 1st will be 1st 2nd will be 2nd and D will be 3rd. If its a manual and you put it in D it will be in 3rd never 1st. Im sure it has some type of shift kit but it seems like its shifting normally...ie...1st is 1st and D is 1st until you get to speed and need 2nd then 3rd. If it were me Id check the line because could be a vaccum leak but thats not something that just "happens." If its not clogged or disconnected Id drop the pan (17 bolts I think) change the filter and pull the valve body out. Its no big deal to do even with the tranny in the truck. Id blow the valve body out with some air and reinstall. I bet there is a small piece of grit stuck behind one of the little ***** that regulate the pressue and make the tranny shift.
If you have a manual valve body 1st will be 1st 2nd will be 2nd and D will be 3rd. If its a manual and you put it in D it will be in 3rd never 1st. Im sure it has some type of shift kit but it seems like its shifting normally...ie...1st is 1st and D is 1st until you get to speed and need 2nd then 3rd. If it were me Id check the line because could be a vaccum leak but thats not something that just "happens." If its not clogged or disconnected Id drop the pan (17 bolts I think) change the filter and pull the valve body out. Its no big deal to do even with the tranny in the truck. Id blow the valve body out with some air and reinstall. I bet there is a small piece of grit stuck behind one of the little ***** that regulate the pressue and make the tranny shift.
this really didn't "just happen" its been happening since i got it but ive always got in into 3rd eventually...
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From: Coal Country, ND
I'd check for vacuum leaks first. I had that problem first hand a couple of months ago. I couldn't get into third till about 60. Found that a vacuum plug had decieded that it was time to move on.
Hey I just noticed that I'm an elder user
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Hey I just noticed that I'm an elder user
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Joined: Mar 2007
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From: Florida
If you don't know where the modulator is....I think it's on the driver's side?????correct me if I'm wrong guys......you could try buying a new one and replacing it...it's pretty cheap.....won't hurt to put a new one in anyways.If that don't work it's just standard vacuum line...nothin special...get a piece of ittake it with you and get a good match.....a guy I know (ie not a buddy) had this happen to his chevy (reason why ) and it was the line......Luck
JR
JR
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From: the side of a mountain
pretty sure its on the passenger side back of the tranny right by the tailshaft. my c6 in my 76 was just as stupid as yours, when i would put it in first sometimes it would feel like going in first other times it would just stay in 2nd and for about 2 weeks every time after i went though a mud hole i would loose 3rd gear eventually i would just give er enough hell and she would shift into 3rd and appearently the governer wouldent make it shift becuase i had er rollin 90 in 2nd at one point.
Last edited by 76 F-150 390FE; Dec 18, 2007 at 07:02 PM.