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WOT Junkie and avid corn burner
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3,734 Posts
Discussion Starter #1 (Edited)
I'll just let this pic speak for itself. If you absolutely have to go fast, for the love of all that is holy, turn OD off. Or this will eventually be the result. That drum is supposed to be smooth on the outside where the band is applied. Someone thought the torque converter failed, it held up just fine despite the damage. The OD band got fried, however.

<a href="http://imgur.com/C7AqF"><img src="http://i.imgur.com/C7AqF.jpg?1" alt="" title="Hosted by imgur.com" /></a>
 

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Voice/Data Guru
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7,814 Posts
I recognize that corner there ;) Glad the chief found the problem . And he told me a long time ago OD off at the track. Forget to sometimes:rolleyes:
 

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&#775;
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3,701 Posts
Whose OD Band and Reverse Drum is that?... :eek:

Can you say toast??






Rayo...
 

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WOT Junkie and avid corn burner
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3,734 Posts
Discussion Starter #4 (Edited)
Whose OD Band and Reverse Drum is that?... :eek:

Can you say toast??






Rayo...
All I'll say is it's not mine, thank goodness.

That band and drum got so hot that the metal on the outside of the band started to change color.
 

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2,435 Posts
The monkey it almost caused him not to be able to race, thank me and 2 others got it going
 

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1,273 Posts
Jeminy Christmas! :zraped:

yeah, i even drop out of OD when i'm passing on the highway.... and i try to avoid using a lot of throttle out on the interstate...
 

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Super Moderator
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12,687 Posts
Here are my pictures.

The cause of my last minute transmission woes. Lesson learned; no more top gear pulls.

On *most cars you won't see this kind of damage with a top gear pull, but when you're making close to 400 rwhp and almost 400 ft lbs of torque bad things happen.

One heavily grooved and shredded drum ...



and one burnt up OD Band ...



 

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Super Moderator
1997 Thunderbird 4.6, 1998 Mark VIII LSC
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9,578 Posts
Was that a kevlar band or an OE?
 

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It was the Kevlar, I don't use oem bands in my build unless that's what the customer wants
 

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&#775;
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The monkey it almost caused him not to be able to race, thank me and 2 others got it going
Did he lose 3rd & 4th gear when that happened?

I would assume just 4th unless the direct clutches got toasted too??



Rayo..
 

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Super Moderator
1997 Thunderbird 4.6, 1998 Mark VIII LSC
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9,578 Posts
The OD band only applies in manual 2 and OD, so I'd assume it would only have affected OD unless something else got cooked.
 

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Super Moderator
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Did he lose 3rd & 4th gear when that happened?

I would assume just 4th unless the direct clutches got toasted too??

Rayo..

The valve body filled with metal shavings and the car got stuck in 2nd. The valve body's not a total loss, disassembly and cleaning and it'll be good as new.

The only reason he didn't clean it and put it back in the car was that we were in a time crunch to get the car ready for racing on Sunday. So he grabbed a spare valve body he had in the shop and used it.

Other than that he replaced the reverse drum, OD band and cleaned and flushed the trans fluid. The trans got a thorough inspection before reassembly and everything else looked good as new. Obviously it worked and ran like a champ when nearly every single run I made was a new personal best over the old build.
 

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PostSlut
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13,597 Posts
so, lets say you want to do 4th gear WOT runs?

get rid of the 4R70W?

what can be done for this not to happen?
 

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Super Moderator
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Keep your HP and torque numbers close to stock and make your 4th WOT runs without risking injury to the trans.

The OD band - even the Heavy duty Kevlar one - can't withstand that kind of abuse for long when you're making the kind of HP and torque numbers that Robert, myself and a few others are making.

I suppose you could switch to a manual trans...
 

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Premium Member
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5,862 Posts
Wait, is this from the WOT 3-4 shift or just doing WOT in 4th in general?

These shushboxes are such garbage.
My guess would be a 3-4 shift at WOT. I know that's a lot of power, but I would think with increased pressure, that band would hold if power was applied after the band was fully engaged. Of course, with the TC unlocked and that torque multiplication going on....... YIKES! lol
 

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Super Moderator
1997 Thunderbird 4.6, 1998 Mark VIII LSC
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9,578 Posts
I thought the problem with a WOT 3-4 was the stub shaft breaking, not the band?
 

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Premium Member
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5,862 Posts
I thought the problem with a WOT 3-4 was the stub shaft breaking, not the band?
I've read that those 300M stub shafts are virtually indestructible! :zdunno:

Here is a Lenteck 4R70W tranny for sale rated to handle 1000 flywheel horsepower with a 300m stub shaft:
http://forums.corral.net/forums/drivetrain-parts/1243718-lenteck-1000hp-300m-4r70w-aode-stubshaft.html

Dirtydog (Alan) sells them GUARANTEED not to break: http://www.dirtydogperformance.com/transmission-rebuild-kits-and-parts/aod/aode/4r70w/4r70w/aode-intermediate-stub-shaft/prod_8.html
 

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Premium Member
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299 Posts
I always tell my wife that I don't care what she does in the Tbird as long as she turns OD off when going WOT.

Nice to have pictures to show.:)
 

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Super Moderator
1997 Thunderbird 4.6, 1998 Mark VIII LSC
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9,578 Posts
I've read that those 300M stub shafts are virtually indestructible! :zdunno:

Here is a Lenteck 4R70W tranny for sale rated to handle 1000 flywheel horsepower with a 300m stub shaft:
http://forums.corral.net/forums/drivetrain-parts/1243718-lenteck-1000hp-300m-4r70w-aode-stubshaft.html

Dirtydog (Alan) sells them GUARANTEED not to break: http://www.dirtydogperformance.com/transmission-rebuild-kits-and-parts/aod/aode/4r70w/4r70w/aode-intermediate-stub-shaft/prod_8.html
I wouldn't sell anything with a guarantee to not break in a 4R70W, leastways would I buy it from Alan. :leftright
 
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