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Matt Cramer
PostPosted: Wed Aug 21, 2013 10:31 am 
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So, I'm working on a turbo build that I expect could get up to 500 lb-ft. Right now there's a healthy but stock 904 in there. Is it possible to modify the 904 to live behind that sort of torque, maybe by putting V8 parts in there, or better to use something more heavy duty?

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Dart270
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PostPosted: Wed Aug 21, 2013 12:42 pm 
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Yes. I would use V8 parts (HD clutch and 4-pinion planetaries) for that. Tilley has a 904 behind his monster turbo.

Lou

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Matt Cramer
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PostPosted: Thu Aug 22, 2013 7:35 am 
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That's good to hear. 904s are supposed to be one of the best drag transmissions out there, and I prefer to work with what I've got.

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DusterIdiot
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PostPosted: Thu Aug 22, 2013 7:43 am 
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904s are supposed to be one of the best drag transmissions out there, and I prefer to work with what I've got.
Back in the day, one of the local racers built a 904 to put behind a built 360 abive the range you are wanting. He had a 727 but surmised that the 904 would shift faster than the 727 would. He worked with a local mopar tranny guru on the build and mods, it helped shave a little off his 1/4 time and with all the abuse he heaped on it, it never tanked on him. So choose the right guts and you will be golden.

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RyGuyTooDry
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PostPosted: Sun Aug 25, 2013 10:30 pm 
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http://www.summitracing.com/parts/hup-hp1290

Throw one of those or something similar in it. I'm building one for my drag car, everyone I know who has a 904 never complains or has problems...

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slantzilla
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PostPosted: Mon Aug 26, 2013 8:45 am 
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Is it a street car or a drag car? How heavy?

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Matt Cramer
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PostPosted: Wed Aug 28, 2013 12:19 pm 
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Street car, probably around 3200 lbs with driver.

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slantzilla
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PostPosted: Wed Aug 28, 2013 9:59 pm 
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Get a good valve body and all the V-8 guts and you'll be fine.

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Matt Cramer
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PostPosted: Fri Aug 30, 2013 1:44 pm 
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Thanks, I figured something like that might be possible.

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Shaker223
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PostPosted: Sun Sep 01, 2013 9:04 am 
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I used the internals from a small block A999. Manual VB and good clutches as well. No issues.

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