i have a 51 f6 coe with what i belive is the t98 4 speed trans am i able to put theclark 204vo that came standard in the f7 big job trucks will it fit in my f6

 

What engine do you have? I believe the F7-8 came with the big 337 V8 engine.....not sure if they share the same bolt pattern as the smaller engines.
With the right combination of parts it might be possible. Or it may require an adapter....
Also likely you will need to modify trans mounts and drive shaft.

EDIT: If you are looking to gain speed/gears, an auxilliary trans like a brownie might be simpler.

 

thanks for reply tinman 52 , engine is 289 or 302 with the stock 1951 4 speed,i belive it to be the t98,i am only interested in more speed so any kind of aux trans or overdrive unit just dont know if the f7 5 speed 204vo will bolt up and im not sure what bell housing or adapter plate i have now im trying to run at 2000 rpm with the stock 2 speed rear end 8r brigestones my calculations say 40 mph would like to get at least 50 mph out of it at 2000 rpm

 

You say that you're running 8R-19.5 tires?

 

mixerman yes on the tires and wheels, after reading a bit more and tinman52 post ill probably be looking for the spicer 5831 aux transmission, it will be easier to install and keep my four speed

 

Most of the Clark 5 speeds I have seen use what's called an SAE bell housing setup. These are a standardized size with an adapter plate for different engines. Very HD and usually use a bigger clutch as well.
If you could find that whole setup from another truck, you'd be golden.
The Spicer aux trans would be much easier though, IMO.

 

any leads on finding the 5831 aux trans and thanks for other info

 

Interesting. I have the Eaton 1350 two-speed and the four speed crash box, but 9R-22.5 tires (8.25x20 equivalence) and 2,200 r/m gives me 49.46 m/h.

 

That little gem was discontinued in the late '60's and is highly sought after, but there was also a Muncie counterpart. Sorry, don't remember the p/n.
Might have some luck here: Boyce Equipment

 

the tire size would help mixer man still investigating and calculating lol would like to put the a box in at this point

 

This is probably your best (and maybe only) bet.
Gear Vendors under/overdrive transmissions the most awarded auxiliary transmissions.

 

checked that out this morning mixer man only 3000 us that turns into 4500 dollars our moneyplus shipping

 

cranegy, where are you, OZ?

Since you have a 302 engine, you might take a look at the ZF 5 speed, used in Ford trucks in the 90's. Would bolt right up. Not sure if they were offered where you are though...

 

im in british columbia does the zf trans have the emergency brake on the rear

 

No, that is one drawback. It does have a PTO port if you need that.