flathead 8 transmission question

H

hbiehl

Junior Member
I need a little guidance. I have a 8BA motor with a 9.5 clutch that I am putting in a 1953 f100. This motor did not come with the truck. The transmission is a T98-148 that did come with the truck. I discovered that the throwout bearing does not fit on the transmission. I need some guidance to what I should do next? What direction should I go?
 
The 53 pu had a 10" and here is pic of 53 trans.
picture.php
 
Trucks all came with 10" or larger clutches, cars came with 9.5" and 9". Trucks also had larger diameter input shafts (1-3/8" vs 1-1/16", as I recall). You'll need to use a Truck clutch to mate the trans.

The correct throwout bearing is C0TZ-7580-B, or SKF N1087. The industry number is BIN 2065.
 
Generally speaking a T98 trans is a 4spd which would require an eleven inch clutch and therefore a HD throw out bearing.
You might want to check the pilot bearing in the crank shaft, it might be to small for the T98 input shaft.
Many years ago I purchased a 58 F100 that had a T98, the guy I bought it from was trying to put a newly rebuilt Y block V8 with a flywheel and clutch for a passenger car three speed. The truck had a T98 4spd. I replaced the flywheel/ clutch with one for a 4spd and the whole thing slipped right together..
 
blucar said:
Generally speaking a T98 trans is a 4spd which would require an eleven inch clutch and therefore a HD throw out bearing....
Click to expand...

My book shows all trucks (all engines and trans') up to F-750's using the same throwout bearing
 
So as a follow-up, is it possible to change the flywheel so that an 10 or 11 inch clutch will bolt up? What needs to be done to the motor to do this if possible?
 
hbiehl said:
So as a follow-up, is it possible to change the flywheel so that an 10 or 11 inch clutch will bolt up? What needs to be done to the motor to do this if possible?
Click to expand...


Some one will be happy to let you have an 11" flywheel for a lot less than the cost of drilling one.

My two fit 59AB, and are near 94941, SF, Ca. The shipping would be silly.

Karl
 
Have you considered going with a different transmission and using the flywheel and so on you have? Unless you plan on pulling tree stumps there is no need for an 11 inch clutch setup, IMO. If it was me I would figure out a way to use the clutch setup I had (you can get a custom clutch to fit the splines on the input shaft) or look at different transmission options.
 
First of all, do you have the correct 1953 F-100 bell housing with the motor? You really must start with this. The motor mount setup for 1953 was unique to the F-100 as well as the clutch release parts.

Assuming that you have the 53 bell housing, you could use the flywheel drilled for a 10" long style clutch, but most of the trucks with the 4 speed transmission came with the 11" clutch. If you're planning on using this pickup truck for pleasure driving, the 10" would suffice.

As you've learned, the flywheel that is drilled for the 9-1/2" clutch will not work in the pickup truck. Also, all Ford trucks starting with 1953 models used a longer transmission input shaft (and corresponding deeper bell housing).
 
Can someone post a photo of the bellhousing, this is something I'm not familiar with (among thousands of other things!).
 
Here you go :)
Not sure if the boltpattern is correct -53 or it´s a later one
 

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Yep, never seen one! Thanks flatheadmurre. Seems like a strange engineering approach to me, but obviously it worked.
 
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