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Old 12-25-06, 11:56PM   #1
Dil Brandow
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Default Max Horsepower with an Automatic Trans

Hi Guys,

What is the most power you can apply to a Powerglide or TH400 before making the change to a clutchless transmission?
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Old 12-30-06, 04:43PM   #2
Ron
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Mike's Transmissions has a glide what will withstand over 2000 HP.
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Old 12-30-06, 08:27PM   #3
Dil Brandow
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Hi Ron,
Do you have an estimated cost for the complete glide with converter to handle that much power.

I'm trying to weigh the cost of the Lenco vs a completely beefed up glide or TH400.
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Old 12-30-06, 10:55PM   #4
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Dil...much information to be gleened at www.mikestransmission.com...
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Old 12-31-06, 10:57AM   #5
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Don't go with the lencodrive, a good turbo 400 is all that you would need.

Been there done that,Lencodrives are constant maintence!
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Old 01-03-07, 06:08PM   #6
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Jack, How much horsepower are you making and what trans do you run?

What is the maintenance on the Lenco?

What's the weak link on the TH400?

The new engine should be around 1,300hp. Is a TH400 cool with that?
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Old 01-05-07, 10:48PM   #7
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Default Maintenance issues

Call Lenco Equipment located here in San Diego California

http://www.lencoracing.com
Lenco can answer your questions.


TurboHydramatic 400 is one of the heaviest duty automatic transmissions ever made.An excellent starting point if the right recipe of parts is selected for the intended power level.
After 450 horse is exceeded and high shock loads are gonna be common the sprag,input shaft ,pump, thrusts, servo,planetary,sets all have to be upgraded to be able to live behind HP/HT drag race type applications.

You can even get lower geared planetary sets for mor torque multiplication in first and second gear.Third will always be a 1:1
Coan has a lot of parts for this.
http://www.coanracing.com
The 400 will require at least annual or sooner maintenance depending on power levels and # of passes per season.

Just my opinion here:
Most all powerglides used in ultra highpower applications are all aftermarket clones now.Original powerglide cases are not preferred anymore in those types of applications.Same goes for most of the internals.Just like top fuel hybrid hemi clone engines they are now purpose built racing transmissions with cases that share the original design concept and exterior dimensions.
Not cheap.

The 'glides and 2 speed Lenco drives are preferred in light weight high power cars ,altereds and dragsters before you get to the direct drive slipper clutch power levels.
Over 3000 lbs,depending on the power level ,you will probably want 3 gears especially in the 1/4 mile.
If you were exclusively 1/8 mile a powerglide might be the ticket with 4.88 or lower (higher numerical ratio) gears.
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Old 01-07-07, 08:25PM   #8
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I can tell you that Bill Takanabe ran a TH400 in his GTO and found the launch to be violent. He switched to a glide and the car was easier at the launch and quicker and faster. His GTO weighs 2,750 pounds.
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Old 01-08-07, 12:15AM   #9
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Default TH400 vs Powerglide

How much quicker and faster than the TH400?
What was the difference in the 60" times.
Great for his combo if it loaded the engine more and saved driveline parts.
Leaving straight is a good thing.
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Old 01-08-07, 12:25AM   #10
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Are you saying that you want a Lenco 4 speed with a clutch?

Real race cars use clutches.
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Old 01-08-07, 12:25AM   #11
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Quote:
Originally Posted by Dil Brandow View Post
Hi Guys,

What is the most power you can apply to a Powerglide or TH400 before making the change to a clutchless transmission?

Define "CLUTCHLESS TRANSMISSION."
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Old 01-08-07, 10:59PM   #12
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I probably used the wrong term. I was thinking about a manual trans that only uses the clutch at launch.

The new engine should make somewhere in the area of 1,300 hp. If I can use my TH400 with no problem I'll stick with it.
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Old 01-08-07, 11:48PM   #13
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Great info guys. Looks like I'll be set with my current trans but I will have to upgrade the converter for sure. My current Art Carr is good to approximately 1,000 but I don't want to chance it. Coan looks to be a very good choice.

I know Bill Creech has a Coan. Is anyone else running a Coan or a Mikes converter in a high HP application?
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Old 01-09-07, 12:33AM   #14
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What's the reason for wanting to run a slushbox behind a 1300hp Pontiac?
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Old 01-10-07, 11:38PM   #15
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After doing a little research it looks like there are a lot of 1,000 - 2,000 horsepower set ups running automatic transmissions.
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