727 differences between D and 1 from a stop

[dfrazz]

I saw this video today from John Cope that also explains why you should do a burnout in 1 and not D.

 

[68 Sport Satellite]

that's a very informative video from John Cope who built my 727. Thanks for sharing.
He also says at the end, if you have an automatic valve body automatic, to not do a burnout in 2nd (which manual shift valve bodies are ok to do).

 

[RemCharger]

that's a very informative video from John Cope who built my 727. Thanks for sharing.
He also says at the end, if you have an automatic valve body automatic, to not do a burnout in 2nd (which manual shift valve bodies are ok to do).

Yes because starting in 2nd is like starting in D. No band apply.
I had a 76 ford halfton that would actually be only in second when in second. That was great in the winter. Not sure what trans that was

 

[BSB67]

that's a very informative video from John Cope who built my 727. Thanks for sharing.
He also says at the end, if you have an automatic valve body automatic, to not do a burnout in 2nd (which manual shift valve bodies are ok to do).

With a full automatic, you can start in manual 1, and shift to 2 and come out of the box in 2 without worries

 

[Photon440]

With a full automatic, you can start in manual 1, and shift to 2 and come out of the box in 2 without worries

You might worry if the tires get traction, slow down the engine, and the transmission wants to shift back to 1 while under power.

 

[toolmanmike]

You might worry if the tires get traction, slow down the engine, and the transmission wants to shift back to 1 while under power.

That seems to be the key. I thought you could do a 1-2 and it would be ok until I studied a lot more about how the transmission works. That shifting back can blow it up. Not just the roller clutch but the drum as well and broken pieces flying around inside the transmission doesn't end well.

 

[BSB67]

So, all you guy with this extreme caution, how many have you exploded, or were personally involved with an explosion.

Doug gave us only one example from his entire career of racing. It happened because the 900 hp car went wheels up so high that the rear bumper hit the ground so hard it unseated the rear tires causing the drivetrain shock that resulted in the tranny mayhem.

 

[toolmanmike]

So, all you guy with this extreme caution, how many have you exploded, or were personally involved with an explosion.

Doug gave us only one example from his entire career of racing. It happened because the 900 hp car went wheels up so high that the rear bumper hit the ground so hard it unseated the rear tires causing the drivetrain shock that resulted in the tranny mayhem.

A friend took out a planetary at MITP a few years ago. He was close to downtown and backed up all the way to the Fair Grounds. He never thought about trying manual low. Good thing he trailered it 4 hours to the show. Yes, a burnout in Drive.

 

[RemCharger]

So, all you guy with this extreme caution, how many have you exploded, or were personally involved with an explosion.

Doug gave us only one example from his entire career of racing. It happened because the 900 hp car went wheels up so high that the rear bumper hit the ground so hard it unseated the rear tires causing the drivetrain shock that resulted in the tranny mayhem.

True... but I think it's more plausible that it may occur with a street crowd than a racing crowd. Most people racing would be applying 1st gear.
I don't recall witnessing one.
But they don't make the billet drum for no good reason.
After 30yrs of good fortune, I think the next 727 build will be getting one

 

[toolmanmike]

True... but I think it's more plausible that it may occur with a street crowd than a racing crowd. Most people racing would be applying 1st gear.
I don't recall witnessing one.
But they don't make the billet drum for no good reason.
After 30yrs of good fortune, I think the next 727 build will be getting one

Except for a street car runny trophy class, most drag cars will have manual shift valve bodies.

 

[BSB67]

A friend took out a planetary at MITP a few years ago. He was close to downtown and backed up all the way to the Fair Grounds. He never thought about trying manual low. Good thing he trailered it 4 hours to the show. Yes, a burnout in Drive.

Perfect. No explosion. That’s good. Can you share the details of the car and what exactly happened? Did the overrunning clutch fail?

 

[toolmanmike]

Perfect. No explosion. That’s good. Can you share the details of the car and what exactly happened? Did the overrunning clutch fail?

I wasn't with him but he was doing a burnout. 70 Bee with a 500 horse 440. It took the sprag.

 

[BSB67]

Except for a street car runny trophy class, most drag cars will have manual shift valve bodies.

Between me and my friends, probably 1000+ passes on automatic shift valve bodies. And honestly, the street abuse in the 70s was way more intense.

Like Doug, not everyone at the track is using low band apply.

 

[toolmanmike]

Between me and my friends, probably 1000+ passes on automatic shift valve bodies. And honestly, the street abuse in the 70s was way more intense.

Like Doug, not everyone at the track is using low band apply.

I beat the crap out of every Mopar I owned except for the 2 I own now. I never broke a transmission but If I was going to spin tires I was always in manual low.

 

[BSB67]

I wasn't with him but he was doing a burnout. 70 Bee with a 500 horse 440. It took the sprag.

Thanks, but the specifics matter. Right? Knowing exactly what and how causes the failure is of critically importance so folk know exactly how to avoid it.

 

[BSB67]

I beat the crap out of every Mopar I owned except for the 2 I own now. I never broke a transmission but If I was going to spin tires I was always in manual low.

Agreed. Good advice.