Auto trans sbm choices ???
#2401646
11/10/17 11:19 PM
11/10/17 11:19 PM
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Joined: Jan 2012
Posts: 106 waco tx
gogo318
OP
member
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OP
member
Joined: Jan 2012
Posts: 106
waco tx
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So we have a small block 450 horse n\a motor going in a lightened up 72 scamp 2dr every one has told me "727 and be done with it " but research tells me a built up 904 is quicker and lighter and just as tough and i have a good core for one aswell but i recently fell into a short tail 727 out of a 73 4x4 and im hearing from a few folks they have a " violent " first gear when used for racing .....whats that mean ? Is it worth building or am i better off continuing my 904 idea?
67 charger fastback 318 stock
67 belvedere II 4dr soft top built 318
68 newport 2dr hard top 318
84 b150 440/727
84 d150 short wheel step side 4x4 lifted
87 omnitruck (you just have to see it )
new addition 63 dart wagon !!!
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Re: Auto trans sbm choices ???
[Re: gogo318]
#2401659
11/10/17 11:40 PM
11/10/17 11:40 PM
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Joined: Jan 2011
Posts: 15,827 Central Florida
larrymopar360
Stud Muffin
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Stud Muffin
Joined: Jan 2011
Posts: 15,827
Central Florida
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I would guess they mean a hard 1st to 2nd shift?
I have a 470hp/525ft.lb. torque stroked small block with a TCI 727 with over 40,000 miles and no complaints. I think they reportedly had some quality control issues, but this is my second with no issues. Previous one had 60,000 miles. It's the 727 "Streetfighter" auto valve body. Little chirp in second at WOT. I prefer the 727 for it's beefier size despite it's increased weight, although I've heard the smaller t-flites can be built to handle high HP.
Facts are stubborn things.
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Re: Auto trans sbm choices ???
[Re: gogo318]
#2401729
11/11/17 01:59 AM
11/11/17 01:59 AM
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Joined: Jan 2012
Posts: 106 waco tx
gogo318
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OP
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Joined: Jan 2012
Posts: 106
waco tx
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Noted on calling john i will and the 904 was my first choice for all the right reasons i was just curious aboit this short tail shaft trans and if it was better for launching no trans brake
67 charger fastback 318 stock
67 belvedere II 4dr soft top built 318
68 newport 2dr hard top 318
84 b150 440/727
84 d150 short wheel step side 4x4 lifted
87 omnitruck (you just have to see it )
new addition 63 dart wagon !!!
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Re: Auto trans sbm choices ???
[Re: gogo318]
#2401732
11/11/17 02:04 AM
11/11/17 02:04 AM
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Joined: Jan 2003
Posts: 12,013 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,013
Benton, IL.
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With the same attention to details when building each tranny, a 727 won't be any more "violent" than a 904.
I guess there could be some unique situations that could favor the 727 in your application. But with the information at hand, I would go with the 904 for the reasons already noted. I have ran them in heavier cars than yours with warmed up 360s and they have always worked and held up very well.
Master, again and still
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Re: Auto trans sbm choices ???
[Re: gogo318]
#2401751
11/11/17 03:15 AM
11/11/17 03:15 AM
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Joined: Jan 2003
Posts: 1,255 Columbus, GA
Michael Ecks
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,255
Columbus, GA
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Is this for street or strip?
For street use I'm in the 727 and be done with it camp. Went through a few 904s including one where the converter snout broke off and ruined the rest of the trans.
I have a TCI streetfighter 727 in the car with a PTC converter and feel way more confident in its durability. For a strip car where worst case scenario is having to push it to the pits and load it onto a trailer, build all the 904's you want. They are definitly lighter, but don't kid youself that they are as tough as a 727 with equal quality/type of parts in each. There's a reason engineers didn't put 904's behind big blocks.
As to the violent first gear thing, so far as I know all 727s have the same gearing. The people telling you that may be confusing them with later model 904s (999?) that had a lower first gear. Behind a stout motor with low rear end gears it would make for a pretty violent launch followed by a pretty boggy 1-2 shift because of the wider ratio split between the two.
"The happiness of your life depends upon the quality of your thoughts" ~ Roman Emperor Marcus Aurelius
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Re: Auto trans sbm choices ???
[Re: gogo318]
#2401786
11/11/17 10:40 AM
11/11/17 10:40 AM
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Joined: Jan 2003
Posts: 8,021 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,021
Tulsa OK
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If you want to set it and forget it go 727. Mine is 16 years old and has tons of miles and passes on it and it still shifts amazing. That being said my car is over weight and I will be swapping to a 904 or low gear 904 over the winter.
68 Barracuda Formula S 340
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Re: Auto trans sbm choices ???
[Re: 340Cuda]
#2402082
11/11/17 07:48 PM
11/11/17 07:48 PM
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Joined: Jan 2003
Posts: 25,747 Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,747
Rio Linda, CA
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The 904 will normally be at at least a tenth faster. And what does that tenth get you in a bracket car? Bragging rights is all.
The INTERNET, the MISinformation superhighway
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Re: Auto trans sbm choices ???
[Re: J_BODY]
#2402882
11/13/17 02:26 AM
11/13/17 02:26 AM
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Joined: Feb 2011
Posts: 1,454 Glendora Ca.
Just-a-dart
pro stock
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pro stock
Joined: Feb 2011
Posts: 1,454
Glendora Ca.
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I've fought some interesting breakage with my 727, but it's lived 30 passes so I might have it behind me. Of course, once it proves itself I'm pulling it out and putting my mild 904 in. 2970lb car off the trans brake running mid 9's.... what could happen! Jay sometimes I think you just try to be a bad example. ha ha 904 for me, faster fits better. They all need good parts
"Just a Bracket car dressed up like a streetcar"
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