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Re: Small block 727 brackets [Re: 5thAve] #3066599
08/09/22 03:06 PM
08/09/22 03:06 PM
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6PAX Offline OP
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Originally Posted by 5thAve
If it's for race and speed use a 904/998/999. If it's a cruiser with a 340 or 360 and you want durability use 727.


This.

Re: Small block 727 brackets [Re: 6PAX] #3066604
08/09/22 03:20 PM
08/09/22 03:20 PM
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727 safer than a 904... never seen a 904 explode behind a street engine. 727 and that front drum can be fun.

A decent 904 build will handle a street 340 fine. Plenty of 904's running around on the street behind 400+ inch SB's. Probably use the same driveshaft as the 4sdpeed to boot.

It's not 1970 anymore and the huge dollars to build a 904 to live is simply not the case. Decent clutches/band and a tf2... I'd love to see a list of all these expensive parts required to make a 904 live. Put an extra clutch in the drum running the thin variants, man that's expensive. LOL Doesn't need an expensive drum to make it safe either... Wanna make a 727 so it's safe, front drum instant $500 bill to the build, you can build a strong 904 for that number alone. BTDT on building 904's

Of course a 727 is a tougher trans to hurt, it's also got bigger parts/clutches in it. Also has other drawbacks as well.

Pick you parts, pay your money.

Last edited by crackedback; 08/09/22 03:28 PM.
Re: Small block 727 brackets [Re: crackedback] #3066858
08/10/22 03:15 PM
08/10/22 03:15 PM
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FurryStump Offline
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I rolled the sprag in my 727 and cracked the case. I run a low band apply valve body, which probably stop it from going boom. In addition to the low reverse drum being jammed stationary from the crushed rollers. Shifted into drive and it seemed slow to engage. Tried to get it to do it again, it wouldn’t. It just felt wrong. I heard it pop once, which was enough of a hint for me to pull it. Could have gone real bad. I had to press the low reverse drum out of the case. The 904 smaller drum diameter allows it to spin faster before it comes apart. The years of the 904 being see as weak are gone. Can you kill one? Sure! If the OP is not tied to the 727, he should look into a 904, he needn’t take my word for it. Search 904 vs 727 see what pops up. Just my experience.


best of 11.39 at 117 mph 1.60 60’. 68 340 S Barracuda Fastback F.A.S.T [IMG]http://i67.tinypic.com/2mnnnnt.jpg[/IMG]
Re: Small block 727 brackets [Re: FurryStump] #3067034
08/11/22 10:24 AM
08/11/22 10:24 AM
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you still have to go out of your way to build a 904 to take the extra abuse when a 727 in stock form already does it and at the end it still has smaller parts that are more prone to failure.
If speed isn't the game there's no good reason to use a 904. For a cruiser I'd take durability any day.

Re: Small block 727 brackets [Re: crackedback] #3067498
08/12/22 08:56 PM
08/12/22 08:56 PM
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Originally Posted by crackedback
727 safer than a 904... never seen a 904 explode behind a street engine. 727 and that front drum can be fun.

A decent 904 build will handle a street 340 fine. Plenty of 904's running around on the street behind 400+ inch SB's. Probably use the same driveshaft as the 4sdpeed to boot.

It's not 1970 anymore and the huge dollars to build a 904 to live is simply not the case. Decent clutches/band and a tf2... I'd love to see a list of all these expensive parts required to make a 904 live. Put an extra clutch in the drum running the thin variants, man that's expensive. LOL Doesn't need an expensive drum to make it safe either... Wanna make a 727 so it's safe, front drum instant $500 bill to the build, you can build a strong 904 for that number alone. BTDT on building 904's

Of course a 727 is a tougher trans to hurt, it's also got bigger parts/clutches in it. Also has other drawbacks as well.

Pick you parts, pay your money.


FOR THE WIN!!

I put an amazingly simple 904 in my Duster 2 years ago. I was going to pull it at 60 passes and check things over,but we’re at 84 and counting. Been mid 1.2 in the 60 and best of 9.10. The ONLY jewelry in the whole build is the A&A front clutch spring pack, and the A500 pump gears. I LOVE the 904 behind a small block! Even in my “street days” my Mirada had a 904 behind the 340 that was in it.

Re: Small block 727 brackets [Re: J_BODY] #3067671
08/13/22 02:43 PM
08/13/22 02:43 PM
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moparx Offline
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what kind of differences did you find between the A500 and the 904 pump gears ?
beer

Re: Small block 727 brackets [Re: moparx] #3067672
08/13/22 02:45 PM
08/13/22 02:45 PM
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Originally Posted by moparx
what kind of differences did you find between the A500 and the 904 pump gears ?
beer


IIRC

A500 uses the D Drive. No more cracked converter snouts

Re: Small block 727 brackets [Re: crackedback] #3067682
08/13/22 03:26 PM
08/13/22 03:26 PM
Joined: Sep 2003
Posts: 16,892
north of coder
moparx Offline
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you may be correct. i forgot about that.
i picked up an A500 take-out at a dealer auction years ago, and it came with a converter.
that converter had the D-drive snout on it, so i tossed it, thinking it was for a front drive 604 transmission.
yeah, i know. i'm a dumazz. it has been proven MANY times over the years.......... spank laugh2
beer

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