I removed this 4 speed transmission from a 63 4x4 F100 today. I believe it’s a T18. But... (and isn’t there always a but?). The casting numbers are not the numbers that the websites use to ID Ford T18’s.

I hope this will be a direct bolt in replacement of a NP435 while it is being rebuilt.

update: after spending a few intermittent hours reading and researching - I came to the conclusion that this is a T98 transmission and will not be a direct bolt in replacement for a NP435 on a FE (360) bell housing.

 

What I did going from a T18 to a NP435 on my 81 F100 4x2 was measure everything.
How it bolts to the bell housing, input shaft size and spline count, how long it was from bell housing face of trans to end of tail housing, that the out put was the same (slip joint for drive shaft).
Also that it came with the shifter stick and they are different. I don't see the stick on yours and why I said it.

I had a used clutch disc to fit on the NP435 so I knew that was good and being I had both trans I measured the input shaft size for the pilot bushing and face of trans to end of shafts.
In my case it was a drop in other than ....... I added an advance adaptor over drive unit so that pushed the trans back 8" so my shifter moved back and shorter drive shaft.

If your measurements are the same and have the shifter stick I would say you are good to go.
BTW I see a T98 on the shifter tower I think its said the early T18's also used the T98 towers.
Also the early T18 I think it is had reverse to the right and forward to the dash, later it was right & back to the seat.
Both the T18 & NP435 of mine were over and back.
Dave ----
edit: I now see a T98 on the side of the trans in the dirt and being pulled from a 63 could it be a T89 and not a T18?
What would the difference be between them (T98 & T18) be?

 

The rear most gear on a t98 gas 43 teeth teeth.

This one has 86. All of this according to the websites.

they say the t18’s had the t98 put into the castings.

measurements seem to be the same between a 435 and the t18. Output shafts, and more.

 

Out of curiosity, do you have a pic from the front, showing the mounting bolt holes? I also have a similarly marked 4 speed in my '64. The mounting holes are closer together on one side.

 

I will take a picture tomorrow for you.

 

If I can get to my T18 under a table in my garage I will have to check to see if the bolt pattern is closer on 1 side than the other and if it has T98 on the castings.

When you say "rear most gear" do you mean reverse gear teeth as in ratio being different for reverse between the two transmissions?
This is what I have found on the web on ratios between the transmissions I was looking atNP435 = 6.69, 3.34, 1.79, 1.00, rev- 8.26

T18A = 6.32, 3.09, 1.69, 1.00, rev- 7.44.

T18B = 4.32, 2.26, 1.51, 1.00, rev- ?

T18 & T19 = 4.02, 2.41, 1.41, 1.00, rev- 4.73. (Close Ratio)

T19 = 5.11, 3.03, 1.79, 1.00, rev- ? T19 has synchro 1st gear
Dave ----

 

This is from the Novak site.

“...The T98's progeny, the T18, used the same top cover as the T98 up through 1979. Many individuals assume they have found a T98 upon seeing the "T98" cast into the top cover, when in fact, it is a T18.

The only way to rule T98 out from being a T18 is to open the top cover and count gear teeth. The T98 will have a 43 tooth first-reverse sliding gear (the rearmost mainshaft gear, spur cut) and a 17 tooth cluster gear (also spur cut).

The T98's mainshaft features a smaller pilot tip than the T18 and has needle roller bearings under second gear....”

I counted the rear most spur gear on the main shaft of this tranny and found 86 teeth.

 

Ok got it did not know of the gear count but did the top cover.
Did you see the T98 on the side of the trans?
I would think if the T98 is there and top cover it would be a T98 and not a T18 with the T98 top cover but could be wrong and your gear count would prove I am wrong?
Either way if the measurements are the same for both then it should bolt in.
Dave ----

 

As requested. Here is the front bolt in section to the bell housing. The bell housing bolt pattern is not consistent with a T18 or NP435 bolt pattern.

I don't understand Novak's site and the T98 gear count description - but after a couple hours of reading and research I came to the conclusion that this is a T98 after-all and will not be a direct bolt in replacement to a FE bellhousing.

 

Thanks 624WD. I have the same transmission.