4 speed transmission
Thread Starter
|
Senior User
Joined: Aug 2005
Posts: 183
Likes: 1
4 speed transmission
I have an 86 f-150 with 300 inline six mated to a 4 speed trans with granny gear. When i first got the truck the transmission would pop out of 3rd gear if you did not hold it in. Now it will pop out of 3rd gear under load(such as going up a hill) even if you do hold it in. I have been gettin by using mainly 2 and 4th, but the gas mileage sucks and its annoying. My question is should i look for a good used trans and replace it with that or should I try to fix it when it comes out. Is the problem most likely a worn gear or something else. Im fairl capable mechanically, i worked as a line tech in a shop for 3 years before coming to college. Is this a job that i want to tackle or should i leave it to a professional or once again should i just try to find a good used trans. Im looking for the least expensive way out that i'm capable of performing. Thanks
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
It definitely needs a rebuild if it's slipping out of gear. You can try to rebuild it yourself, but you need to identify the tranny first, it's either a T-18 or an NP435. Look at the door post code if it's original, A=NP435 and F=T-18.
There are rebuild kits around if you have the downtime available and the tools to tackle it yourself.
There are also a ton of these things in the junkyard. They get horrible gas mileage so no one really wants one, but they're tougher than nails. It's not unusual to put over 500k miles on one before they go. I have to wonder what you did to yours to break it.
There are rebuild kits around if you have the downtime available and the tools to tackle it yourself.
There are also a ton of these things in the junkyard. They get horrible gas mileage so no one really wants one, but they're tougher than nails. It's not unusual to put over 500k miles on one before they go. I have to wonder what you did to yours to break it.
Post Fiend
Joined: Jan 2004
Posts: 6,610
Likes: 2
From: Northwest, Arkansas
Rossta86
Welcome to Ford Truck Enthusiasts. In order to make it easier to navigate please read the following.
Please view the main forum page to find the best forum to ask any Technical questions.
Inside certain forum's there could be a Read First: thread or threads attached to the top.
Please read these threads before posting.
Please post all "items wanted" and "items for sale" in the classified section.
In Addition to the Tech Forums there are State/Province Chapters that bring local members together for meets, events and just plain fun.
Once again...Welcome to the FTE Family
You have 60 minutes to edit any post made in case there is something you would like to change or add.
Welcome to Ford Truck Enthusiasts. In order to make it easier to navigate please read the following.
Please view the main forum page to find the best forum to ask any Technical questions.
Inside certain forum's there could be a Read First: thread or threads attached to the top.
Please read these threads before posting.
Please post all "items wanted" and "items for sale" in the classified section.
In Addition to the Tech Forums there are State/Province Chapters that bring local members together for meets, events and just plain fun.
Once again...Welcome to the FTE Family
You have 60 minutes to edit any post made in case there is something you would like to change or add.
Thread Starter
|
Senior User
Joined: Aug 2005
Posts: 183
Likes: 1
Yea i wonder what the previous owner did to it as all i have heard about these trannies is that there indestructible although the tranny itself has 268,00 miles on it i believe. thanks for the quick response andym. Anyone have a tranny laying around?
Fleet Owner
Joined: Sep 2005
Posts: 28,609
Likes: 18
From: Lake Tahoe, Nevada
Originally Posted by Rossta86
I have an 86 f-150 with 300 inline six mated to a 4 speed trans with granny gear. When i first got the truck the transmission would pop out of 3rd gear if you did not hold it in. Now it will pop out of 3rd gear under load(such as going up a hill) even if you do hold it in. I have been gettin by using mainly 2 and 4th, but the gas mileage sucks and its annoying. My question is should i look for a good used trans and replace it with that or should I try to fix it when it comes out. Is the problem most likely a worn gear or something else. Im fairl capable mechanically, i worked as a line tech in a shop for 3 years before coming to college. Is this a job that i want to tackle or should i leave it to a professional or once again should i just try to find a good used trans. Im looking for the least expensive way out that i'm capable of performing. Thanks
It was the first time I had opened one of these and it was an easy job. I was impressed with the transmission, they probably use the same unit in a five ton truck too. It's very heavily built.
Bdox
Thread Starter
|
Senior User
Joined: Aug 2005
Posts: 183
Likes: 1
Bdox, mine is also a 4x4, by shift fork do you mean the the lever that the clutch slave cylinder moves to operate the clutch or actually something in the transmission? I have dealt with motors and just about everything else on a car except transmissions so please excuse my ignorance. thanks
Freshman User
Joined: Nov 2004
Posts: 36
Likes: 0
I read somewhere that if you tow these trucks equipped with the NP 435 with the driving wheels on the ground, it is susceptible to rapid wear. It isn't recommended that you do this. The symptom of this rapid wear is that 3rd gear will pop out while driving under load. This seems the likely case with your truck.
Last edited by Yoshi; Sep 17, 2005 at 11:20 AM.
Trending Topics
Fleet Owner
Joined: Sep 2005
Posts: 28,609
Likes: 18
From: Lake Tahoe, Nevada
Hi,
By shift fork, I meant the part mounted on the shift rails which are mounted inside the cover of the transmission. The fork fits into a groove on the selector hub which when moved, locks the mainshaft to one gear or another.
You can get a look by removing the carpet, and the sheet metal cover above the transmission. Put the transmission in neutral, unbolt the cover (which the floor shifter goes through,) and carefully lift up the whole assembly. Get a book with an exploded view of the tranmission so you can idtentify the parts.
In my truck, I had to change the mainshaft bearings because they were loose enough that the gears (maybe the whole mainshaft,) could move for and aft enought that shifter was not pushing the selector hub all the way into third position.
Hope that helps, Bdox
By shift fork, I meant the part mounted on the shift rails which are mounted inside the cover of the transmission. The fork fits into a groove on the selector hub which when moved, locks the mainshaft to one gear or another.
You can get a look by removing the carpet, and the sheet metal cover above the transmission. Put the transmission in neutral, unbolt the cover (which the floor shifter goes through,) and carefully lift up the whole assembly. Get a book with an exploded view of the tranmission so you can idtentify the parts.
In my truck, I had to change the mainshaft bearings because they were loose enough that the gears (maybe the whole mainshaft,) could move for and aft enought that shifter was not pushing the selector hub all the way into third position.
Hope that helps, Bdox
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Fleet Owner
Joined: Sep 2005
Posts: 28,609
Likes: 18
From: Lake Tahoe, Nevada
Hey Yoshi,
just read your post, re: np 435
Exactly what part is it that wears, and how does that happen. Or can you refer me to the site, or article where you learned this?
Thanks, Bdox
just read your post, re: np 435
Exactly what part is it that wears, and how does that happen. Or can you refer me to the site, or article where you learned this?
Thanks, Bdox
Posting Guru
Joined: May 2002
Posts: 1,306
Likes: 0
From: Bryan/College Station
http://www.novak-adapt.com/knowledge/np435.htm
It's down near the bottom of the page in a big WARNING box.
Chris
It's down near the bottom of the page in a big WARNING box.
Chris
Freshman User
Joined: Nov 2004
Posts: 36
Likes: 0
Here is the link:
http://www.novak-adapt.com/knowledge/np435.htm
Scroll down to the bottom of the page and read the text in the box that says "A Cautionary Issue on Towing". It's kind of interesting that this page on converting and adapting transmissions to Jeeps came up. It's a useful page to find out info on your Manual transmission. I don't have this problem on my truck, I just wanted to find out how to identify my transmission. I hope this helps...
http://www.novak-adapt.com/knowledge/np435.htm
Scroll down to the bottom of the page and read the text in the box that says "A Cautionary Issue on Towing". It's kind of interesting that this page on converting and adapting transmissions to Jeeps came up. It's a useful page to find out info on your Manual transmission. I don't have this problem on my truck, I just wanted to find out how to identify my transmission. I hope this helps...
