Operation NP435 & Over Drive

[Gary Lewis]

I got carried away, after I got out and moving I did more than just welding the pan.

Did a test fit and had to do a little clearing then hit the welds with the grinder to look a little prettier but the pan will be under carpet.

What I started with - SROD pan

The one on the right is what I ended up with, the left is the T18 pan.

You can also see how I took the high part of the pan out so I hope the carpet would fit.

Under side showing the seal, I used auto & marine rubber seal.

Before I put the sticks on I test fitted the used auto carpet and I it looks like it will fit but when I go to install I will have to remove the seat to fit the carpet under it but that cant happen till I get shifter boots that I am happy with.

Before I bolted the pan down I filled the OD with 30W motor oil that is called for for break in.

Break in is drive for 15 to 30 min. drain and refill with the 90W they sent with the OD unit.

While I was filling the OD I was draining the transmission as I did not know what shape if any oil was in it.

It was black but did not look that bad. With the pan off and the shifter & fill plug out I was able to fill thru the shifter and look for the oil to come out the fill hole.

After 2 qt of gear oil and not getting any oil on a finger I had to look up how much it took.

One post said 6 gallons! I knew that could not be right. After going they many posts to use or not use gear oil or 50W motor and GL4 or GL5 gear oil. The 2 qt were GL4 / GL5 Lucas HD gear oil.

I had a little, not even half a qt, 10W-40 & 10W-30 that I added to the transmission to get the level to come out the fill plug.

So with the OD & transmission filled with oil I put the shift sticks on and the pan. I did set the 1 shifter boot I may use on the pan but is not screwed down.

So as of right now I am waiting for the drive shaft so I can do my break in of the OD unit.

Dave ----

You got even more done than I guessed at. Good job!

It is looking good, and thorough.

[FuzzFace2]

You got even more done than I guessed at. Good job!

It is looking good, and thorough.

It must be a muscle thing with my hip because as I got moving it did not hurt as much, when I first got up I could hardly stand up straight.

Thanks on the looking good and did you expect anything less that thorough

With the carpet installed I want it to look like the factory installed the over drive and why I placed the OD stick in the pan. That's where the 4x4 stick is right?

Dave ----

 

[Gary Lewis]

You got even more done than I guessed at. Good job!

It is looking good, and thorough.

It must be a muscle thing with my hip because as I got moving it did not hurt as much, when I first got up I could hardly stand up straight.

Thanks on the looking good and did you expect anything less that thorough

With the carpet installed I want it to look like the factory installed the over drive and why I placed the OD stick in the pan. That's where the 4x4 stick is right?

Dave ----

No, I certainly didn't expect anything less. And yes, on a Bullnose truck the 4wd shifter is through the pan. Later years went through the side of the hump. So yes, yours will look like Ford did it - which is what I'm doing on both of my trucks.

[FuzzFace2]

No, I certainly didn't expect anything less. And yes, on a Bullnose truck the 4wd shifter is through the pan. Later years went through the side of the hump. So yes, yours will look like Ford did it - which is what I'm doing on both of my trucks.

The drive shaft place called late today, he got busy yesterday and forgot to call me, so we have a drive shaft and it is installed.

On the way home I stopped at 4 Wheel Parts in Raleigh to see if they had either of the shift boots I was looking for, they don't stock any. I also asked about GL4 gear oil they only had Lucas syn. and it was for GL5 so it was a bust to stop.

So we took the truck for it's 30 min (ran 40 min long) break in. I now need to change the 30W break in motor oil for the 90W the OD came with and will do a little more driving but I have so things I need to look into.

First some asked about the noise the unit makes.

First I have to say I DO NOT have any carpet and that will be fixed when I get shift boots.

It does wine pretty good when in OD and in lower gears (granny, 2nd, 3rd) in 4th it is not bad. If you down shift from 4th OD to 3rd OD it will really wine but note I have light weight (30w) motor oil in it for break in. I thing it has gotten a little more quite as I was driving or I was getting use to it? but I am sure with 90W gear oil in it it should be a little more quite.

I also found with the little drive I did, no high way yet, like others that splitting the lower gears was lot worth it with out a load. Once it in 4th then going in and out of OD is the way to go.

Now what I need to look into:

The speedo is not reading right. I need to see what color the drive gear is and what color the T18 was and if I can swap the 2 drive gears? I know I was told the T18 driven fear would work and it did go into the NP435 trans but want to make sure before I go thru all the work.

I may also a set of driven gears when I was getting it to work & read right with the T18 trans.

The speedo is also bouncing now and never did this before.

I think because I had to move the cable back it is tight and why the bouncing.

I wonder if a 4x4 cable would work as it has to be longer to reach the transfer case.

I need to look into the 4x4 cable and gear swap and I should be good on the speedo.

I also will order the 2 shifter boots I think will work so I can get the carpet installed.

Oh the OD shifter needs to be higher & back more. Once the truck was running the stick moves forward a little more and hard to reach. I need to check the thread size and I think I can get extensions at a truck stop not far from here. Should be a nice high way test drive.

Dave ----

[Gary Lewis]

The drive shaft place called late today, he got busy yesterday and forgot to call me, so we have a drive shaft and it is installed.

On the way home I stopped at 4 Wheel Parts in Raleigh to see if they had either of the shift boots I was looking for, they don't stock any. I also asked about GL4 gear oil they only had Lucas syn. and it was for GL5 so it was a bust to stop.

So we took the truck for it's 30 min (ran 40 min long) break in. I now need to change the 30W break in motor oil for the 90W the OD came with and will do a little more driving but I have so things I need to look into.

First some asked about the noise the unit makes.

First I have to say I DO NOT have any carpet and that will be fixed when I get shift boots.

It does wine pretty good when in OD and in lower gears (granny, 2nd, 3rd) in 4th it is not bad. If you down shift from 4th OD to 3rd OD it will really wine but note I have light weight (30w) motor oil in it for break in. I thing it has gotten a little more quite as I was driving or I was getting use to it? but I am sure with 90W gear oil in it it should be a little more quite.

I also found with the little drive I did, no high way yet, like others that splitting the lower gears was lot worth it with out a load. Once it in 4th then going in and out of OD is the way to go.

Now what I need to look into:

The speedo is not reading right. I need to see what color the drive gear is and what color the T18 was and if I can swap the 2 drive gears? I know I was told the T18 driven fear would work and it did go into the NP435 trans but want to make sure before I go thru all the work.

I may also a set of driven gears when I was getting it to work & read right with the T18 trans.

The speedo is also bouncing now and never did this before.

I think because I had to move the cable back it is tight and why the bouncing.

I wonder if a 4x4 cable would work as it has to be longer to reach the transfer case.

I need to look into the 4x4 cable and gear swap and I should be good on the speedo.

I also will order the 2 shifter boots I think will work so I can get the carpet installed.

Oh the OD shifter needs to be higher & back more. Once the truck was running the stick moves forward a little more and hard to reach. I need to check the thread size and I think I can get extensions at a truck stop not far from here. Should be a nice high way test drive.

Dave ----

Cool! Glad you got it going, Dave!

As for the whine, I'll bet it gets quieter as it breaks in. But, were it I, I'd put lots of damping material on the floor and the tranny cover.

[FuzzFace2]

Cool! Glad you got it going, Dave!

As for the whine, I'll bet it gets quieter as it breaks in. But, were it I, I'd put lots of damping material on the floor and the tranny cover.

In a few I will order the shift boots so I can put the carpet down and it had a jute backing.

Then again it is a truck what would it be with out a little noise.

Besides I can turn the radio up

Dave ----

[grumpin]

In a few I will order the shift boots so I can put the carpet down and it had a jute backing.

Then again it is a truck what would it be with out a little noise.

Besides I can turn the radio up

Dave ----

Good job! Thanks for letting us know.

[FuzzFace2]

Good job! Thanks for letting us know.

Thanks I hope it will help others that are thinking of going for the AA OD as there is not a lot of information out on the web on them or it is vary basic that you can get from AA site.

I ordered the boots last night and looked into a longer speedo cable but the web sites either list the same part numbers for both 4x2 & 4x4 cables? And then they don't list the size so how would you know if it is longer than what I have?

Anyone know if the T18 drive gear will swap on to a NP435 trans?

That would help a lot as I can use the one I know has worked.

I was told the driven gear would work and it does but think the bouncing is the tight cable I hope to fix with a longer one.

With a little more tweaking it will be just the way I want it.

Dave ----

[Gary Lewis]

Thanks I hope it will help others that are thinking of going for the AA OD as there is not a lot of information out on the web on them or it is vary basic that you can get from AA site.

I ordered the boots last night and looked into a longer speedo cable but the web sites either list the same part numbers for both 4x2 & 4x4 cables? And then they don't list the size so how would you know if it is longer than what I have?

Anyone know if the T18 drive gear will swap on to a NP435 trans?

That would help a lot as I can use the one I know has worked.

I was told the driven gear would work and it does but think the bouncing is the tight cable I hope to fix with a longer one.

With a little more tweaking it will be just the way I want it.

Dave ----

Dave - On the drive gears, I think they do interchange. Here's a snippet of the 1985 MPC listing of drive gears. Two things to point out. First, that they called out which tranny got what gear. Second, that the T-18 & 19 with 3.07 gears got C80Z-B.

Now here's the 1981 listing. From what I read in the transmission application charts the T-18 wasn't introduced until 1983, so the 4/M/T was the NP435. And it used C80Z-B with certain gearing.

[Gary Lewis]

Dave - On the drive gears, I think they do interchange. Here's a snippet of the 1985 MPC listing of drive gears. Two things to point out. First, that they called out which tranny got what gear. Second, that the T-18 & 19 with 3.07 gears got C80Z-B.

Now here's the 1981 listing. From what I read in the transmission application charts the T-18 wasn't introduced until 1983, so the 4/M/T was the NP435. And it used C80Z-B with certain gearing.

And on the speedo cable length, here's what the MPC says. And I don't have this in the documentation so will put it on the Documentation/Driveline/Speedo Gears page. But, I haven't gotten my mind around what these charts are telling me, so would appreciate it if someone would enlighten me.

However, there is also the cables for trucks with speed control, which are here: