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Old 10-11-2012, 03:52 PM
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hulaman hulaman is offline
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52 F6 Replace T98 Transmission

Hello all,

I drained and replaced the gear oil in my crash box. And just as I suspected there was a lot of metal in the mix. A few large pieces the size of a small nail clipping and the rest was just gritty.

It's been jumping out of gear lately and being 60, she's been around the block.

Question is... rather than rebuild or replace this one, what it the best transmission swap? Those familiar know I have to double clutch on every gear change. I don't want to do that anymore.

I prefer to keep the manual setup with shifter on the floor. I have a FHV8 with dual speed rear end. Remember, it's a 2 ton flat bed.

Thanks!
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Old 10-11-2012, 04:10 PM
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OOPS... maybe I don't have a T98... if I have to double clutch... that means unsynchronized... and the T98 is synchro...

I do know it's a 4 speed manual transmission... and reverse is far to the right and down
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Old 10-11-2012, 04:20 PM
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Wow,

Sorry guys, I answered my own question with my question. I found the shifting pattern of the two transmissions. A Synchro reverse is to the right and UP, non synchro is DOWN.
Looks like it's the T98 I want, not the one I HAVE...
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Old 10-11-2012, 08:36 PM
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The T98 was available with the big 6 in 52 only. The rear trans mount is specific to the 48-52 so later guts will work, but you need the 52 case.

I have 2 now, one to go in my F6, the other needs to be rebuilt.
Also, if the rear bolts on the crossmember have nuts, its a crashbox. Or just pull the pto and clean out / inspect the gears.


Quote:
Originally Posted by hulaman View Post
Wow,

Sorry guys, I answered my own question with my question. I found the shifting pattern of the two transmissions. A Synchro reverse is to the right and UP, non synchro is DOWN.
Looks like it's the T98 I want, not the one I HAVE...
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Old 10-11-2012, 10:03 PM
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52 Merc 52 Merc is offline
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52 Merc is a name known to all52 Merc is a name known to all52 Merc is a name known to all52 Merc is a name known to all52 Merc is a name known to all52 Merc is a name known to all
The T98 was the standard transmission behiind the 254-6 in at least 1951 and 52. I've had them in both. My understanding is that is was also an option with other engine combinations, but I wouldn't swear to that fact without further documentation.

I'm not sure what you were meaning by the "guts will work," but the cases are totally different between the T98 and the crashbox 4 speed. Guts don't swap between them.
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Old 10-12-2012, 07:33 AM
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Sorry, to clarify, I meant the gears in a later T98 will fit into a 52 T98 case, but later T98 cases don't have a rear bracket to mount in the early truck. So you can source a T98 from a 53 or later truck, but you will still need a rear bracket from a 52.

As you said, the T98 and spur gear trans are completely different inside.
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Old 10-14-2012, 08:16 AM
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Quote:
Originally Posted by hulaman View Post
Hello all,

I drained and replaced the gear oil in my crash box. And just as I suspected there was a lot of metal in the mix. A few large pieces the size of a small nail clipping and the rest was just gritty.

It's been jumping out of gear lately and being 60, she's been around the block.

Question is... rather than rebuild or replace this one, what it the best transmission swap? Those familiar know I have to double clutch on every gear change. I don't want to do that anymore.

I prefer to keep the manual setup with shifter on the floor. I have a FHV8 with dual speed rear end. Remember, it's a 2 ton flat bed.

Thanks!
The best swap for you would be a T-98. Only the first version will work. It was available as an option from 1950-52, models F-4/6, with any engine, and came standard in any 1950-52 F-6 with the 254 6 cylinder. It must not have really caught on until 1952, because that's the most common year truck you will find one in.
The common T-98 that was in F-100/600's 1953-55 can be used for it's internal parts, with the exception of the input and output shafts. The top is also the same, but the case is completely different, and won't interchange. In 1956, the angle of all of the gear teeth was opposite, so nothing will interchange except for the top. Also, the shift lever is specific to 1950-52.
Chuck
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Old 10-15-2012, 12:54 PM
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Thanks Chuck!

I am going to keep an eye out for one so I get it on my terms...
instead of when I HAVE TO.

-chris
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Old 10-15-2012, 12:54 PM
 
 
 
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