904 Mash up

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Alecb

Alecb

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I'm collecting parts to swap a 360 into my 73 Duster, one of those parts is a small block transmission. I found a 904 from the 60s that is allegedly a performance transmission. The main issue is that it has a fixed yoke at the back. Could I take the tail shaft and other interior components from the 904 that is behind my slant six and combine them with the small block 904 to create a small block, slip yoke, 904 transmission?
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That’s a 273 transmission, nothing performance about that. They came in 64/65 darts, valiants and barracudas
Alecb said:
I'm collecting parts to swap a 360 into my 73 Duster, one of those parts is a small block transmission. I found a 904 from the 60s that is allegedly a performance transmission. The main issue is that it has a fixed yoke at the back. Could I take the tail shaft and other interior components from the 904 that is behind my slant six and combine them with the small block 904 to create a small block, slip yoke, 904 transmission?
View attachment 1715734022
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sell it to a 65 guy and buy a 72+ 904 and get a B&M 360 weighted flex plate.
 
Yep, the part throttle kickdown of the 72 and up 904 makes it a much better street driver.

I went from a 66 transmission in my 66 barracuda to a 74 transmission and it is much nicer driving with a part throttle kickdown allowing 3-2 shifts while still going up to around 35 mph.
 
Alecb said:
I'm collecting parts to swap a 360 into my 73 Duster, one of those parts is a small block transmission. I found a 904 from the 60s that is allegedly a performance transmission. The main issue is that it has a fixed yoke at the back. Could I take the tail shaft and other interior components from the 904 that is behind my slant six and combine them with the small block 904 to create a small block, slip yoke, 904 transmission?
View attachment 1715734022
Click to expand...
A bunch of issues here.
1.) The ball & trunion tailshaft, as you've already noticed...
2.) It's a '65 & earlier trans, so it has the cable shift mechanisms and valve body.
3.) It has the early input shaft which limits you to early convertors, which means later convertors will not interchange.
4.) The early convertors use a smaller nose which will require an adapter bushing into your 360 crank register.
5.) No off-the-shelf performance convertors available, only custom builds; limited number of suppliers that can/will build one for you... $$.
By the time you find, switch, & convert everything over to suit your '73/360 combo, you will be time and money ahead to just find the right trans to begin with.
 
Those early 904's have the small torque converter register and input shaft. You're converter selection will be very limited unless you have one custom built. As stated get a 72+ and thank us all later! 65'
 
This is great info, I had no idea the 60s 904s had different input shafts and converters. This was just a “is this possible?” idea I had while I was looking at this trans. I’ll keep my eyes out for a 72+ trans.
 
66fyssh said:
Yep, the part throttle kickdown of the 72 and up 904 makes it a much better street driver.

I went from a 66 transmission in my 66 barracuda to a 74 transmission and it is much nicer driving with a part throttle kickdown allowing 3-2 shifts while still going up to around 35 mph.
Click to expand...
Yep! The part throttle kickdown is the only way to go!
 
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