T-10 4-speed on a Flathead

[Rock Hornbuckle]

Any previous threads on marrying a t-10 to a flathead. I have a t-10 and a t-5. I'm thinking of putting one of them in my '41. I have an 8BA in the car with a '39 3-speed and a Columbia 2-speed. I was thinking of replacing the Columbia with a standard 3rd member. Any suggestions?

[DICK SPADARO]

Neither your t-10 or t-5 is a simple conversion. If your goal is to improve your hi speed and lower the engine RPM both the 3 spd and the T10 both have 1-1 final drive. Other than another intermediate gear its the same. Since the T-5 is an over drive this gives you approximately a 30% over dive ratio so in 5th overdrive you would have a similar ratio with a stock 3:78 rear end as you would with the Columbia engaged and the 3 spd.

[Ol' Ron]

The biggest advantage of the T-10 is: most bolt to the stock ford 59/53 passenger car bell housing. They also have a dual bolt pattern on some models. for other applications.
But as Dick says you will not improve mileage or cruise RPM, so after spending a great deal of money and time. You'll still have the same thing.

[rotorwrench]

The late 51 Mercury bell housing will work for a narrow 4-bolt Borg Warner bolt patern and will also work with the 1941 clutch equalizer shaft as long as the engine is positioned for it.

The other option is the truck 4-speed hogs head bell with an adapter.

[Bassman/NZ]

Originally Posted by Ol' Ron

The biggest advantage of the T-10 is: most bolt to the stock ford 59/53 passenger car bell housing. They also have a dual bolt pattern on some models. for other applications.
But as Dick says you will not improve mileage or cruise RPM, so after spending a great deal of money and time. You'll still have the same thing.

Except you'll have synchros on all, nda a trans that a flattie will not destroy.

[paul2748]

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Go with the T-5 - for the o/d. But after all is said and done, will you be better off with that and conventional rear vs the Columbia and stock trans??

[Mart]

Sort of following the same idea, as you already have the columbia, you already have a near perfect setup. It simply isn't worth fitting the other boxes. If you fitted the 4 speed and regular rear you'd have a definite de-grade of the current setup. Don't forget fitting either of the gearboxes mentioned will involve chassis mods and converting to an open drive rear end, with suspension mods.

I can't see enough benefit to warrant the work involved.

You might even devalue the car quite substantially.

Mart.

[4tl8ford]

You may run into problems with the shift location with both the T-10/T-5 - They both come thru the floor to the rear of the 39 top shifter - In the 48 & up trucks there is interference with the seat.