Protrans pro brake 7.0 index

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o1heavy

o1heavy

1974 dart sport
Joined
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Ok Ive been working with getting my leaf spring dart to cut a light on a 4ths protree
And this weekend things have really came together
The reaction time was .030/.015 all weekend which was roughly 15 passes
I lost this round in the semi’s (driver gave it back)
Just wanted to share
Leafspring car protrans 904 with Darren’s probrake I’m pretty proud of the old car
Funny thing was I had a seasoned guy
Explaining to to me how a leaf spring car won’t cut a light
Anywho I’m left lane
 
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Dave and Darren are good people! Miss them being out west, but Texas is treating them well!
 
I hope to switch back to my W8 mill in April and will resume my stock shaft testing
 
A body said:
I hope to switch back to my W8 mill in April and will resume my stock shaft testing
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I’ve considered moving on to a 727/turbo 400 but this little 904 is doing its part
So far I’m impressed with it
And some how I gotta believe it is helping me with my reaction time
I’m not a big bracket racer so I’m not real sure how well these lights would hold up in the bracket world but i was tearing up the index guys this weekend
Was concerned that I built the wrong car
To be competitive, now I just need to get it closer the number and I’m confident I’ll be competitive
Super excited about this season
 
My buddy had a 727 in his Hemi dart bracket car. Made many bitchin runs. Was talked into a TH400. He went with the builder that builds most of the Chevy trannies for the Chevy guys. First tranny exploded on the line. Next made the 60 ft. Third tranny never made the quarter mile. 727 back in. No more Chevy **** for him. The guy building the TH400 supposedly used the best parts money can buy. He has never had this much bad luck in all his years. Next up for the 727 when it gets freshened is the light weight kit that removes 7.27 lbs from the rotating assambly. Kim
 
oldkimmer said:
My buddy had a 727 in his Hemi dart bracket car. Made many bitchin runs. Was talked into a TH400. He went with the builder that builds most of the Chevy trannies for the Chevy guys. First tranny exploded on the line. Next made the 60 ft. Third tranny never made the quarter mile. 727 back in. No more Chevy **** for him. The guy building the TH400 supposedly used the best parts money can buy. He has never had this much bad luck in all his years. Next up for the 727 when it gets freshened is the light weight kit that removes 7.27 lbs from the rotating assambly. Kim
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You can’t blame that on the Chevy Transmission. That falls on the builder.
 
This guy only had a few failures over the years. 2 different cases with this car. I don’t know the story as it is a pretty big sore spot with my buddy. Kim
 
B3422w5 said:
Exactly. Most everybody is well aware a 400 is capable of taking more power and abuse than a 727.
Not even debatable
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Can you elaborate. Are you saying stock versus stock.
What do you mean by take more horsepower. What performance level?
 
Duane said:
Can you elaborate. Are you saying stock versus stock.
What do you mean by take more horsepower. What performance level?
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Just exactly word for word what i said. The 400 is capable( can be modded) to survive with more power put to it, than can a modded 727.
Not Rocket science.
Call John Cope or Rick Allison at A&A. They will agree. And they build 727’s
 
Duane said:
Can you elaborate. Are you saying stock versus stock.
What do you mean by take more horsepower. What performance level?
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We aren’t really talking about stock transmissions in this post but for any serious high horsepower build you go with a powerglide or 400 Chevy transmission.
 
B3422w5 said:
Just exactly word for word what i said. The 400 is capable( can be modded) to survive with more power put to it, than can a modded 727.
Not Rocket science.
Call John Cope or Rick Allison at A&A. They will agree. And they build 727’s
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Not disagreeing or agreeing, Just asking for some kind of comparison. I have a local friend who attends the Mopar weekend at Norwalk every year. He has won the Ten grand Nationals and runner end up another time. His car has run 8:60,s consistently at 155 mph.
3 speed aluminum 727 torque flight in a Daytona. Never breaks.
800 plus horsepower Indy headed big block. Maybe the turbo 400 is stronger,
But I have another friend who used run 10.00 in a Gto and used to fail the sprag repeatedly till we learned to do the burnout in 3rd gear lol. But the torque flight is plenty strong enough.imho
My buddies Daytona most years runs in big dog class and is usually the only torqueflite out there. You gotta be good to beat him. Rick Allison tried to hire him years ago as he does his own builds.
 
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Duane said:
Not disagreeing or agreeing, Just asking for some kind of comparison. I have a local friend who attends the Mopar weekend at Norwalk every year. He has won the Ten grand Nationals and runner end up another time. His car has run 8:60,s consistently at 155 mph.
3 speed aluminum 727 torque flight in a Daytona. Never breaks.
800 plus horsepower Indy headed big block. Maybe the turbo 400 is stronger,
But I have another friend who used run 10.00 in a Gto and used to fail the sprag repeatedly till we learned to do the burnout in 3rd gear lol. But the torque flight is plenty strong enough.imho
My buddies Daytona most years runs in big dog class and is usually the only torqueflite out there. You gotta be good to beat him. Rick Allison tried to hire him years ago as he does his own builds.
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I ran 8.40@160mph in my Daytona with a powerglide but what does that prove. Two lightweight low horsepower combos. The turbo 400’s are popular with the high and I mean high horsepower small tire power adder guys. SFI cases are available for both powerglides and 400’s. More gear choices at cheaper prices. I think Cope finally released a second gear leave valve body for a 727 but I’m betting it is 2-3 times more than one for a 400 turbo.
 
pittsburghracer said:
I ran 8.40@160mph in my Daytona with a powerglide but what does that prove. Two lightweight low horsepower combos. The turbo 400’s are popular with the high and I mean high horsepower small tire power adder guys. SFI cases are available for both powerglides and 400’s. More gear choices at cheaper prices. I think Cope finally released a second gear leave valve body for a 727 but I’m betting it is 2-3 times more than one for a 400 turbo.
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Well like I said, I never said it wasn't stronger, I asked for more info how you guys came to that conclusion. Dnj has a 727 Sfi case in development. Leah Pruett has said in her YouTube video that her drag pak car uses a turbo 400 only because the 727 case is the weak link. Perhaps that will change in the future with the Sfi 727 case. I know lots of modern Chrysler cars that are running turbo 400 because they think torque flights blow up lol, so can turbo 400,s
If not built and used correctly.
 
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I now have three off these (powerglide)for my cars with different low gears in each one. A 1.69 for my heads up car,(big block) a 1.98 in my black Duster, and a for now spare with a 1.80 gear in it. 6 bolts to switch from big block to small block use. Zero safety shields needed. Takes least than 5 minutes to change bellhousings.
 
pittsburghracer said:
View attachment 1715485594 View attachment 1715485595 View attachment 1715485596 I now have three off these (powerglide)for my cars with different low gears in each one. A 1.69 for my heads up car,(big block) a 1.98 in my black Duster, and a for now spare with a 1.80 gear in it. 6 bolts to switch from big block to small block use. Zero safety shields needed. Takes least than 5 minutes to change bellhousings.
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Just for your information, my buddy with the Daytona uses a 2:28 first gear ratio in it to get it to stick. Same concept as a glide with the lower first gear ratio. Nice piece you have there.
 
Duane said:
Just for your information, my buddy with the Daytona uses a 2:28 first gear ratio in it to get it to stick. Same concept as a glide with the lower first gear ratio. Nice piece you have there.
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I ran a stock 1.76 in my Daytona. Not real quick in the 60 foots average around a 1.21 but the only aftermarket part in my transmission was a transbrake valve body. It cost 100-150.00 to rebuild my transmissions. lol
 
pittsburghracer said:
I ran a stock 1.76 in my Daytona. Not real quick in the 60 foots average around a 1.21 but the only aftermarket part in my transmission was a transbrake valve body. It cost 100-150.00 to rebuild my transmissions. lol
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If you think about it, even a turbo 400 or a 727 is probably overkill for say a 10 second car. Protrans puts 904 internals in the 727.
I've heard they are developing with ati a turbo 350 that also will use 904 parts.
 
Duane said:
If you think about it, even a turbo 400 or a 727 is probably overkill for say a 10 second car. Protrans puts 904 internals in the 727.
I've heard they are developing with ati a turbo 350 that also will use 904 parts.
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I don’t want to muck up this post anymore than I already have but a buddy of mine that passed away several years ago ran a Chevy in super stock. His transmission cost thousands to build and had Mopar 904 guts in his three speed Chevy transmission. His car ran 8.90’s. I wish I could give more info but I can’t. Sorry for the muck job.
 
As John mentioned the aftermarket support for the GM transmissions is much greater, not to mention converters.
 
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