cant get into 1st or reverse
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Junior User
Joined: Dec 2004
Posts: 64
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From: Trumbull Ct.
cant get into 1st or reverse
im having a problem with getting into first gear and reverse. my truck is a 79 f150 with a 4 speed manual.
im not sure what it is but its the tranny with the super low gearing especially in first. i read somewhere that it might be New Process 435 4 speed. when i try to get into first or reverse the gears will grind. sometimes if i fool with it and put it in second then quickly into first it will go in but not always. I also have the same problem with reverse and sometimes if i monkey it around in other gears it will go in but just like 1st it will only go in sometimes and if not it grinds.
what could this be. i read somewhere that it could be the shift fork but im not sure nor do i know what that is. i also just drained and refilled it with some type f tranny fluid but that didnt do it. im hoping that was the right kind... at least that what the auto parts told me.
thanx -aj
im not sure what it is but its the tranny with the super low gearing especially in first. i read somewhere that it might be New Process 435 4 speed. when i try to get into first or reverse the gears will grind. sometimes if i fool with it and put it in second then quickly into first it will go in but not always. I also have the same problem with reverse and sometimes if i monkey it around in other gears it will go in but just like 1st it will only go in sometimes and if not it grinds.
what could this be. i read somewhere that it could be the shift fork but im not sure nor do i know what that is. i also just drained and refilled it with some type f tranny fluid but that didnt do it. im hoping that was the right kind... at least that what the auto parts told me.
thanx -aj
Elder User
Joined: Dec 2000
Posts: 581
Likes: 2
From: Somerset, Pa
First off, it should have 50w engine oil in it not type F
In the np435 tranny 1st and reverse are unsynconized so it is normal for it not to want to go in. With the shifter in nutral let out the clutch then put the clutch back in, once you put the clutch back in the shifter should go into 1st or reverse really easy.
In the np435 tranny 1st and reverse are unsynconized so it is normal for it not to want to go in. With the shifter in nutral let out the clutch then put the clutch back in, once you put the clutch back in the shifter should go into 1st or reverse really easy.
Elder User
Joined: Dec 2000
Posts: 581
Likes: 2
From: Somerset, Pa
My truck, before I repainted is had a Ford sticker in the glove box that stated "use 50W engine oil in manual transmission and transfercase" .
Newer manual transmissions actually do take automatic tranny fluid in them but it is too thin for older transmission (like these big cast iron monsters)
There is not a synconizer or "blocking ring" in front of the first and reverse gear in these trannies which means that you cannot put the transmission in that gear unless the clutch RPM's match what the tailshafts RPM's should be for that gear. New Process (the tranny manufacturer) opted not to synconize the reverse and low since you should be stopped when you use those gears anyways. What the synconizers do is use the friction of brass on steet to speed up or slow down the clutch relative to the tailshaft so that the gears can mesh without raking each other. Older transmissions (like 51 and earlier 4 speed truck tansmissions) and big rig transmissions are completely unsynconized and require some skill to change gears withough a lot of grinding. You have to "double clutch" them and even then it can be tough.
Newer manual transmissions actually do take automatic tranny fluid in them but it is too thin for older transmission (like these big cast iron monsters)
There is not a synconizer or "blocking ring" in front of the first and reverse gear in these trannies which means that you cannot put the transmission in that gear unless the clutch RPM's match what the tailshafts RPM's should be for that gear. New Process (the tranny manufacturer) opted not to synconize the reverse and low since you should be stopped when you use those gears anyways. What the synconizers do is use the friction of brass on steet to speed up or slow down the clutch relative to the tailshaft so that the gears can mesh without raking each other. Older transmissions (like 51 and earlier 4 speed truck tansmissions) and big rig transmissions are completely unsynconized and require some skill to change gears withough a lot of grinding. You have to "double clutch" them and even then it can be tough.
Originally Posted by eetmyshourts
thanks for the tip ill try it. couple of questions for ya. u meant 50w motor oil in the transmission just seemed strange ive never heard of it used in a tranny? and also what does 1st and reverse being unsynchronized mean
Post Fiend
Joined: Mar 2003
Posts: 14,413
Likes: 3
From: Sarnia, Ontario, CANADA!
You could try adjusting the clutch. It is probably not releasing all the way. Just follow the pedal under the truck and you will see a couple nuts that are on a threaded rod. Turn the 2 or 3 full turns. It should be enough. Then try it. Good luck!
-Matt
-Matt
Senior User
Joined: Dec 2004
Posts: 121
Likes: 0
i seem to be haveing the exact same problem with 1st and reverse. about 70% of the time when i come to a complete stop it wont go into 1st. and if i push the clutch in again and release it i have to wait a bit to put it in gear or it will grind. this is extreamly annoying for me and everyone else around me when the light turns green and im sitting there not moveing because it wont shift in gear. another few problem's im haveing is that sometimes it doesnt want to come out of 1st and i have to yank on it pretty hard, plus it doesnt seem to go into any gear very smoothly, i am constantly haveing to ram the stick into gear. im not sure, but i think ive got the same tranny, its an 85 F250 4x4 with an Inline 6 and a 4 speed. any idea why this tranny is being so difficult? any help would be greatly appreciated.
