Best deal on a 904?

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Mattmoto441

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Whats the best deal out there for a 904 these days? Preferably something with a manual valves body because I'm sick of messing with the stupid linkage. I seen summitracing.com has this tci but was wondering what else is out there?
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Might call Rick at A and A and see what he could do for you. The one you selected comes from a company that sometimes has been reported to not have as good a reputation as others.
 
Mattmoto441 said:
Whats the best deal out there for a 904 these days? Preferably something with a manual valves body because I'm sick of messing with the stupid linkage. I seen summitracing.com has this tci but was wondering what else is out there? View attachment 1715765110
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The transmission doesn't have anything to do with the linkage? If you put a new transmission in you're still going to have to mess with the linkage and get it correct...
 
j par said:
The transmission doesn't have anything to do with the linkage? If you put a new transmission in you're still going to have to mess with the linkage and get it correct...
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I think he means with a manual valve body there's no kickdown linkage/cable..
 
The best deal is one you build yourself.
 
RustyRatRod said:
He can sure do that, but there's no low band apply, which is nice to have and it's a forward pattern.
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Please explain no low band apply?
And I have a customer who has a reverse pattern in his 904 and bragged about how much easier it was going to be in the first thing he did was put it in 3rd and tried to take off.. claiming before that it was going to be more natural and obviously it wasn't. ..
 
For the life of me I don't know why my voice command always switches he for you? It like says the opposite of what I'm saying? It pisses me off and I have to keep going back and correcting but by that time someone has already read what I was saying..
 
j par said:
Please explain no low band apply?
And I have a customer who has a reverse pattern in his 904 and bragged about how much easier it was going to be in the first thing he did was put it in 3rd and tried to take off.. claiming before that it was going to be more natural and obviously it wasn't. ..
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Saves the sprag...
 
j par said:
Please explain no low band apply?
And I have a customer who has a reverse pattern in his 904 and bragged about how much easier it was going to be in the first thing you did was put it in 3rd and tried to take off.. claiming before that it was going to be more natural and obviously it wasn't. ..
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The low band apply helps keep the sprag in place. The 904 isn't as bad as the 727, but they can still grenade in a similar fashion if they are treated to just the right circumstance. Doing a burnout in first gear and hooking up on the shift to second can cause the over running clutch to spin incredible RPM ripping the sprag out of the back of the case and causing a tremendous transmission explosion.

It's really simple to cure without any extra parts by making SURE it doesn't hook on the 1-2 shift and make it spin on into second gear, but it's safer with a manual valve body, because you can completely eliminate that issue by doing the burnout in second gear. The low band apply helps make everything stronger in that respect. You can tell one has low band apply when you run it up in first gear and back off the gas. If you get gear braking, you have low band apply. If when you back off the gas in first gear and you coast like in neutral, no low band apply. A lot of manual valve bodies don't have it. And IMO, the reverse pattern is mire natural to shift. Pulling back to shift is more comfortable than pushing forward....at least I think it is.
 
This is a Torqueflite explosion from a ripped out sprag.

TORQUEFLITE EXPLOSION.jpg
 
j par said:
Still not explained..
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It's like a light bulb, I know what it does but I can't explain how it does it. It's why I like a professional to build my transmissions if it's for a special duty. Transmissions don't interest me enough to learn it, and I don't need it enough to justify it.
 
RustyRatRod said:
The low band apply helps keep the sprag in place. The 904 isn't as bad as the 727, but they can still grenade in a similar fashion if they are treated to just the right circumstance. Doing a burnout in first gear and hooking up on the shift to second can cause the over running clutch to spin incredible RPM ripping the sprag out of the back of the case and causing a tremendous transmission explosion.

It's really simple to cure without any extra parts by making SURE it doesn't hook on the 1-2 shift and make it spin on into second gear, but it's safer with a manual valve body, because you can completely eliminate that issue by doing the burnout in second gear. The low band apply helps make everything stronger in that respect. You can tell one has low band apply when you run it up in first gear and back off the gas. If you get gear braking, you have low band apply. If when you back off the gas in first gear and you coast like in neutral, no low band apply. A lot of manual valve bodies don't have it. And IMO, the reverse pattern is mire natural to shift. Pulling back to shift is more comfortable than pushing forward....at least I think it is.
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My point on the reverse valve body was what's natural is what you're used to generally. When people grow up shifting forward and then the first try and they try to use a reverse sometimes they don't feel natural. For instance when I rode my Harley and I had a hand shift and a foot clutch and I wrote it for several years that way and one day I jumped on my uncle's motorcycle I almost crashed it coming off the freeway because the controls didn't feel natural and I had to think about what I was doing all of a sudden going very fast coming off the freeway LOL.. it wasn't natural to have the clutch on my hand and the shifter on my foot...
I know when I put the Transco 3 full manual shift kit in the 904 I had with that pink motor for my wife it would start out in any gear you put it in... I personally used a quicksilver ratchet shifter and loved it..
 
And I'm fully aware of the shifting into second before letting off on a torque flight and the 727 is worse about it..
 
I just didn't know a reverse manual valve body cured that and was wondering how it did it..
 
j par said:
My point on the reverse valve body was what's natural is what you're used to generally. When people grow up shifting forward and then the first try and they try to use a reverse sometimes they don't feel natural. For instance when I rode my Harley and I had a hand shift and a foot clutch and I wrote it for several years that way and one day I jumped on my uncle's motorcycle I almost crashed it coming off the freeway because the controls didn't feel natural and I had to think about what I was doing all of a sudden going very fast coming off the freeway LOL.. it wasn't natural to have the clutch on my hand and the shifter on my foot...
I know when I put the Transco 3 full manual shift kit in the 904 I had with that pink motor for my wife it would start out in any gear you put it in... I personally used a quicksilver ratchet shifter and loved it..
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Believe in me when I say, once you get used to shifting "backwards" you wonder why they never made them like that.
 
j par said:
I just didn't know a reverse manual valve body cured that and was wondering how it did it..
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A forward one will too if it has low band apply, but I don't think anybody makes one.
 
....and I'm not 100% SURE the TF3 takes low band apply away from a stock valve body. It may not. I've never used one.
 
RustyRatRod said:
The low band apply helps keep the sprag in place. The 904 isn't as bad as the 727, but they can still grenade in a similar fashion if they are treated to just the right circumstance. Doing a burnout in first gear and hooking up on the shift to second can cause the over running clutch to spin incredible RPM ripping the sprag out of the back of the case and causing a tremendous transmission explosion.

It's really simple to cure without any extra parts by making SURE it doesn't hook on the 1-2 shift and make it spin on into second gear, but it's safer with a manual valve body, because you can completely eliminate that issue by doing the burnout in second gear. The low band apply helps make everything stronger in that respect. You can tell one has low band apply when you run it up in first gear and back off the gas. If you get gear braking, you have low band apply. If when you back off the gas in first gear and you coast like in neutral, no low band apply. A lot of manual valve bodies don't have it. And IMO, the reverse pattern is mire natural to shift. Pulling back to shift is more comfortable than pushing forward....at least I think it is.
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coming out of the water box burnout is a place where some get into touble
 
318willrun said:
It's like a light bulb, I know what it does but I can't explain how it does it. It's why I like a professional to build my transmissions if it's for a special duty. Transmissions don't interest me enough to learn it, and I don't need it enough to justify it.
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If it's just a matter of the valve body it's just 10 bolts that hold the valve body in..
Why people let something as simple as an automatic transmission continue to be a mystery is far beyond me.. I'll never pay somebody thousands of dollars to put $120 rebuild kit in my transmission...
I'm shocked you haven't covered this on you boob but then again something useful like teaching people how to use a $99 Harbor Freight flex wire welder would be extremely useful as well...
 
RustyRatRod said:
Believe in me when I say, once you get used to shifting "backwards" you wonder why they never made them like that.
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100% agree that a reverse pattern wood likely be much more natural as you're shifting up and shifting forward LOL..
I've had my electric La-Z-Boy for over a year now and why they make the up button the forward one and the down button the back one I'll never figure out?..
Something so simple can be so damn annoying LOL every time I want to go up I go down every time I go down I want to go up..
 
j par said:
100% agree that a reverse pattern wood likely be much more natural as you're shifting up and shifting forward LOL..
I've had my electric La-Z-Boy for over a year now and why they make the up button the forward one and the down button the back one I'll never figure out?..
Something so simple can be so damn annoying LOL every time I want to go up I go down every time I go down I want to go up..
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Maybe find someone in your area with a reverse pattern and try it. You'll never go back.
 
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