Small block 727?

[jeff alder]

The 904 is an excellent transmission all by itself.

 

[Big.J.007]

When given the choice and having both transmissions to choose from I'll pick the 727 all day long!

 

[jeff alder]

When given the choice and having both transmissions to choose from I'll pick the 727 all day long!

We might as well if it was original to the car and did not have to modify things to make it fit...if it had a bolt in sprag and we needed the extra weight and beef for large horsepower application. Car craft had some dyno tests published in the past where the engine needed approximately 20 more horsepower just to spin the 727...so if you aren't running high R's the 904 is an excellent original choice.

 

[Big.J.007]

The 904 vs 727 debate is almost akin to the slant 6 vs the 318... It takes a lot more parts and a lot more money to build a slant into the power a 318 makes stock. Same goes for the 904 stock they can't take the same abuse as 727 stock and survive.

We might as well if it was original to the car and did not have to modify things to make it fit...if it had a bolt in sprag and we needed the extra weight and beef for large horsepower application.

 

[jeff alder]

The 904 vs 727 debate is almost akin to the slant 6 vs the 318... It takes a lot more parts and a lot more money to build a slant into the power a 318 makes stock. Same goes for the 904 stock they can't take the same abuse as 727 stock and survive.

without a doubt...if that is the goal and modification to put it in wasn't needed.

 

[Bobzilla]

Except -
1. I already have a brand new 2800 stall TC sitting in the garage for the 727.
2. There is some question about TC availability for the early 904.
3. I'm not going to put an unchecked trans in behind an updated motor. Both trans' would have to come apart anyway. Not doing it twice if I don't have to.
4. Have to get a new driveshaft made anyway, so it doesn't matter if one is 4" shorter than the other.
These are the reasons I decided to just go with the 727. The fact that it's a little tougher than the 904 is just icing on the cake.
Now for the flex plate issue...oh, and the 8-3/4...and the wheels/tires...

Are you going stock Magnum fuel injection or carbureted?
Mancini racing is selling flex plates for the 5.9 Magnum balance. If you do go with the 727 you can use the factory 5.9 Magnum weighted flex plate and slot one of the torque converter holes. Or you can add the 5.9 Magnum weight to your converter and use the existing 727 flex plate. Lots of ways to handle that.

 

[A body]

and personally on the 727 i won’t run one without a billet drum. There’s $700 you can spend elsewhere using the 904.

I know it’s not much…. But I’d run the 904. I ran our stock component 904 in my race car over 100 passes without an issue. The only “jewelry” in the build was an A&A front drum spring pack and my Pro Trans brake. I was pretty impressed with the unit.