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Old 06-06-2005, 02:59 AM
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C6 Blues

Is there a stronger transmission than a C6 that will bolt to a Ford 460? My 460 puts out 830hp and 900ft lbs torque. The front pump in the trans fails and the engine thrust main bearing gets wiped out.

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Old 06-06-2005, 04:54 AM
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Actually, to me, it sounds like you may have the problems backwards. I really don't see how the HP would have anything to do with wiping out the front pump in the trans. I also don't see how the pump is going to wipe out the main bearings in the engine. You may want to check the alignment of the trans to the engine, and convetor to the flexplate. I have also seen in the past where the convertor is wrong for the crankshaft, and even that there is a pilot bearing/bushing in the end of the crank, causing that type of problem. If there isn't some play between the convertor and the pump, and convertor and the crank, it will force the crank forward, and the pressure on the pump gears will wipe out the pump.

Just my opinion.
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Old 06-07-2005, 09:08 AM
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C6 Blues

I agree. The trans. bellhousing was checked. Couldn't really check the engine. I bought a stronger flexplate as the old one was .060 out and looking like a couple of the spokes were twisting--there were no cracks. The trans shop told me they thought that the cold converter was "balloning" and a stronger converter housing was bought. I couldn't see the difference though.
I installed new main bearings and the endplay was brought back to .005.

The trans bolted up nice but with no real way to check alignment it is a crap shoot. At this time things seem ok but when the front pump finally let go I had no warning signs. The trans oil had been clean and not running hot. Shifting was fine and no noises to indicate a problem was on the way.

I am thinking that with the torque that this engine puts out that something may not be strong enough between the engine and the trans front pump. Which leaves the TC and the flexplate under serious scrutiny. Guess we'll see what happens?

Any other thoughts?
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Old 06-07-2005, 09:29 AM
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I assume this is a drag car???

If so how many passes did you get before each problem???

When you stage the car do you put it on the converter as soon as you turn on the second bulb or do you wait untill the tree starts?????

Keith
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Old 06-07-2005, 08:50 PM
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I would like to know what valve body you are using.

Brand , design ( full manual , transbrake ??) .


There have been some problems with certain type/brand of valve body. The boost circuit will hydraulic lock... main line pressure jumps to 450 -600 psi. This pressure will burn up a pump in seconds, balloon a converter or try to push the converter out of the tranny.

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Old 06-08-2005, 08:56 AM
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C6 Blues

Thanks for the input guys.

This ride is on the street and run appx. 500 miles per week. I have not been beating it up but it is nice to launch it occasionaly.

I believe the valve body to be stock with modifications at the trans shop (Level 10, in New Jersey). They claim that things were OK hydraulically and would not admit to any problems in the trans that might cause converter balooning? I could not positively determine that there could have been a problem with the converter. Nevertheless, it was replaced with a stronger unit.

Any way to check converter PSI,s while installed in the truck? What are the specs?

John
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Old 06-08-2005, 09:03 AM
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You have a 830 hp engine you drive 500 miles per week?????

keith
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Old 06-09-2005, 04:20 AM
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Thank you Crosley. I stand corrected. I have never run across that before. Then I never ran across a 800 HP engine that is street driven either.

Aaron
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Old 06-09-2005, 09:06 AM
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I did not know I was correcting your info..... I've seen this problem in vehicles and on our tranny dyno. A pressure spike that pegged our 400 psi gauge.

We had to open the bypass/equalizing hole in the separator plate for the boost circuit.

We called the manufacturer and were greeted will a cold shoulder on this tech info


Quote:
Originally Posted by adtkart
Thank you Crosley. I stand corrected. I have never run across that before. Then I never ran across a 800 HP engine that is street driven either.

Aaron
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Old 06-09-2005, 11:56 AM
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C6 Blues

Thanks again gents,

830hp on the street hard to believe? This is accomplished by starting with a Ford 460 and then adding toys like twin turbos, laptop programmable EFI, intercooler, waste gates, etc. Oh yea, this was dynoed with 87octane oxygenated pump gas!

The 4 wheel drive is a nice assistance in launching--what fun.

Crosley, is there a way I can check to see if I have that PSI spike problem with the trans installed?

John
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Old 06-09-2005, 07:03 PM
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Quote:
Originally Posted by Gemini
Thanks again gents,

Crosley, is there a way I can check to see if I have that PSI spike problem with the trans installed?

John

hook a 300 psi gauge to the tranny and watch what is happening while the vehicle is in use
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