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T98 into an F-2?

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Old 07-02-2015, 08:21 PM
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T98 into an F-2?

I am really interested in replacing my crashbox with a synchro-silent four speed. I have been reading threads, looking at my parts books, looking at pictures, and doing google searches which invariably led me back to this forum. I am trying to figure out exactly what is required to mount a 1952 and earlier T98 into my F-2.

Here is what I think is true. I'd like a check on this in case I am wrong:
1 - The early T98 was standard equipment behind the 254 M series six cylinder.
2 - It was a rare option in F-4, F-5, and F-6 trucks behind 226 sixes and 239 V8s.
3 - The clutch housing from a crashbox four speed can be used if you bore out the pilot area.
4 - The transmission is longer and requires shortening the driveshaft.
5 - The rear bearing retainer / rear mount casting is weak and likes to crack.
6 - The shifter is in the same location as the crashbox shifter; no relocation of the shifter hole in the transmission cover.

The questions I have that I haven't been able to find answers on:
7 - I remember reading that the rear bearing retainer / rear mount casting is taller on the F-4/5/6 transmissions than it is on the F-2 transmissions. Is this true?
8- If 7 is true, can a shorter rear bearing retainer / rear mount be fabricated to work in my F-2? (I kinda doubt this since it looks like the retainer goes forward right under the T98).

Thanks for any information you can share,
Fred
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Old 07-02-2015, 08:40 PM
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Does your F-2 have the "deep hoop" crossmember already?

As I recall, the deep hoop is also mounted further back and down on bigger trucks, and that was the reason the rear mounts differ on bigger trucks. I may be mistaken there, tho.
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Old 07-02-2015, 09:40 PM
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Call Chuck, but iirc he said it works by turning the rear bearing retainer backwards. Stu
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Old 07-03-2015, 08:18 AM
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Fred, I believe the rear mount / bearing retainer is the same for the F2 - F6. IIRC, the T98 that I am installing in my F4, my brother and I had in a '51 F2 behind a V8 years ago. As far as I know, the only thing you will have to do to install the T98 in place of the T9, is shorten the front driveshaft about 2". If you have a T98 without the half bell / hogshead on it, you will have to bore the bearing retainer hole to fit over the retainer on the T98. I have a couple of T98 half bells if you need one. The rear mount can be a weak point. I did have to weld and reinforce mine. The shift tower is in the same place.
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Old 07-03-2015, 08:53 AM
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Click the image to open in full size.

Here is a T9, with the rearward facing mounting foot.


Click the image to open in full size.

Here is a T98 transmission. Note the forward facing mounting foot
Fred here are a couple of photos. The half bells are identical with the exception of the bore for the bearing retainer. IIRC, the T9 retainer is 3.875" OD and the T98 is 4.00" OD. The mounting foot on the T98 has bolt holes that are threaded, so the mounting bolts go up thru the bottom of the crossmember/transmission mount and thread into the foot. Joblot has quite a few parts for the T98, so you can overhaul one if necessary.
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Old 07-03-2015, 09:08 AM
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The illusion of the squared "hoop" of the F2-F6 is that it does sit lower, but the frame rails on the F4-F6 are taller, so the engine mounts are on a higher plane than the F1-3. That means the hoop on the F2/3 would have to sit lower than the F4-6 to keep all things equal. They aren't.

The bearing retainer is 5 bolts, not in a star pattern, and the speedo cable is on the opassenger side, so flipping it around wouldn't work. Could you cut and weld the mounting foot backwards? sure, why not?



I went out and measured. I got about 6" from centerline of tailshaft to bottom of mounting foot on the F6 T98, and F6 T9. And about 5.5-5.75" on the F2.
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Old 07-03-2015, 07:59 PM
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So it sounds like the using the F-6 mount would raise the back of the transmission approximately 1/2 inch in my F-2. I will look this weekend to see how much floor clearance I have above my crashbox, and if my clutch linkage would be affected.

Thanks for the information.
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Old 07-03-2015, 09:19 PM
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The T-98 will bolt right into an F-2/3. The rear of it will be higher, but it will work just fine. You may have to space the clutch pivot bracket up on the frame, to correct the angle of the cross shaft. And, of course, you have to shorten the drive shaft.
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Old 07-03-2015, 10:33 PM
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Excellent Chuck, thank you.
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Old 07-03-2015, 10:33 PM
 
 
 
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