Re: Building a strong 904?
[Re: polkat]
#947576
03/10/11 01:55 AM
03/10/11 01:55 AM
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Joined: Jan 2003
Posts: 9,826 las vegas
70AARcuda
master
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master
Joined: Jan 2003
Posts: 9,826
las vegas
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727 parts are not going to fit into a 904 case....so ever is telling you that dont know anything about 904s
use good alto disc...kolene steels...and good bands...
Tony
70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: Building a strong 904?
[Re: polkat]
#947579
03/11/11 12:16 AM
03/11/11 12:16 AM
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Joined: Jan 2005
Posts: 3,699 Newport, Mi
Evil Spirit
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master
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Newport, Mi
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First, you will get a lot more accurate answers if you state what you are trying to do - street car, drag race, a little of both. And with what - car, horsepower, gear ratio, etc. It is IMPOSSIBLE to answer your Q's without this info. Next, you need to decide what type of valve body (V/B) you want to use - full auto w/linkage, stock V/B w/shift kit, reverse pattern, reverse w/low band apply, etc. Why? Because all the good hard parts WILL NOT LAST with a crap V/B. Also, you don't need high $ clutches, bands, steels for a stock rebuild. So after you post what you are trying to do and what you are trying to do it with - I bet you will get some good advise on how to build your trans.
Free advice and worth every penny... Factory trained Slinky rewinder.........
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Re: Building a strong 904?
[Re: Evil Spirit]
#947580
03/11/11 01:07 AM
03/11/11 01:07 AM
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Joined: Feb 2005
Posts: 5,221 Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
Why? Because all the good hard parts WILL NOT LAST with a crap V/B. Also, you don't need high $ clutches, bands, steels for a stock rebuild.
I agree, The VB is one of the most important parts of the trannys life (its basically the "heart"), A warn out or stock VB & the parts will not hold up to much abuse (even heavier clutches/bands ect.), I ran a "stock" rebuilt 904 with nothing but a Cheatah FMVB & re-adjusted the bands & the tranny was kick-ass.
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Re: Building a strong 904?
[Re: polkat]
#947583
03/11/11 05:56 PM
03/11/11 05:56 PM
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Joined: Jan 2003
Posts: 3,078 Edmonton, Alberta, Canada
Dartman75
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Edmonton, Alberta, Canada
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I don't think you need anything super special to make a 904 happy behind a turbo'd slant in that power range (assuming torque is around similar levels). The key is quick shifting valve body with higher line pressures to hold things. My tranny runs 190 or 210 (can't recall) with a 4.2 lever and I put around 550 ponies though it and only slightly less torque. Mine is a 999 case and internals because the case is supposedly stronger than the early 904's, and it had a low gear set (2.74 instead of 2.54). For whta you're building, you don't need a limits pushing setup, or even the setup that I run. A good basic build with an eye to quality clutches bands and good Valvebody selection and you'll not have a problem. BTW, I love the idea of a turbo slant Greg
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Re: Building a strong 904?
[Re: polkat]
#947586
03/11/11 09:25 PM
03/11/11 09:25 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Put any power to it and be ready to start replacing front pumps. My mild street 318 with 360 heads combo (right at 300hp) used to destroy front pump ears on my 904 about every 6 months on cue.
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Re: Building a strong 904?
[Re: dOrk !]
#947589
03/12/11 01:44 AM
03/12/11 01:44 AM
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Joined: Feb 2005
Posts: 5,221 Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
GUYZ .... what is this crap VB thing ?
I have done plenty of TF's and I have maybe found one or two TF's that had faulty VB's.
You have to TWEAK a stock VB for a HP application ... but you do not need a high$ piece to make-it-live OR make it perform well.
Ok then.... Please advise US of things that can be done for different HP levels sense you know these things , we are ALL ears
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Re: Building a strong 904?
[Re: polkat]
#947591
03/12/11 02:18 AM
03/12/11 02:18 AM
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Joined: Jan 2003
Posts: 9,826 las vegas
70AARcuda
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master
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las vegas
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I guess this subject come up once a month or so about how 904 can not hold the power...
i been using a 904 ...the same 904 since 1993 in my 69 Barracuda that has run 10.70s out here in las vegas..
it has been rebuild once back in 2004...
the 904 has the same pump...only part that has broken was the rear sprag due to ring and pinion breaking....
904 has 5 disc in front clutch pac...uses kelvar bands and alto disc/kolene steels..
the big spring in the front clutch pac has been replaced with a 24 spring kit...
been using the same tranzact pro transbrake since 1993...so the poor little 904 is getting slammed with a transbrake too...
got another 904 going on it 4th season...same parts as above in 71 dart that has gone a best of 11.03...while changing engine last month...I took this 904 apart to check it out..everything looked great...just replace sealing rings ...it is back in service...
car is on trailer to go racing tomorrow...
so if you are breaking parts...find another trans guy..or read a book...
Last edited by 70AARcuda; 03/12/11 02:19 AM.
Tony
70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: Building a strong 904?
[Re: polkat]
#947592
03/12/11 02:32 AM
03/12/11 02:32 AM
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Joined: Jan 2005
Posts: 3,699 Newport, Mi
Evil Spirit
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master
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Newport, Mi
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Quote:
No, probably not necessary, but the reliability factor goes up with stronger parts.
But i was not asking if I should do it, but HOW to do it.
Items of interest. Most of the interchange issues is in the front pump/converter/input shaft area. First concern is the lockup/non lockup converter/pumps - obviously you want a non lockup pump/input shaft. Second issue is the "weakness" of the pump. There has been breakage issues with the converter drive ears cracking/breaking off. The solution is to have the converter made with a moly drive stub and use the A&A billet pump gear, or have the converter and pump converted to A500 parts (have flats instead on slots). Now you are up to input shaft/direct drum and pump compatibility - there are a couple different size hubs where the sealing rings seal to the pump, so make sure that you have a match there. Also, if you use a 5 clutch direct (Front) drum, you have to use the matching pump with the clearance ground for the larger drum, or grind it. Ideally, if you could find a non lockup 999 you could pretty much drop in the guts as a whole, but personally I haven't tried to do a slant 6 trans conversion, and it's hard to envision every step online. If I was piecing one together, I'd look for the 2.74/1.54 (low) gearset, 4 clutch forward (rear) drum, a 4 clutch direct(front)drum would work, but a 5 would be nice, and probably use a 4.2 kickdown band lever. New stock clutches and band would last, premium would last longer. This isn't a complete step by step to your build, but I hope it steers you in the right direction. Hopefully someone like John Kunkel will fill in the blanks for you.
Free advice and worth every penny... Factory trained Slinky rewinder.........
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Re: Building a strong 904?
[Re: Evil Spirit]
#947593
03/12/11 02:42 AM
03/12/11 02:42 AM
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Joined: Jan 2003
Posts: 9,826 las vegas
70AARcuda
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master
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i put 5 disc in the 4 disc front drum..and using the stock 2.45 gearing.
Tony
70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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