Broken input shaft or flexplate?

[J.Davy]

I was towing up a long grade in 4x4 and something went bang ,R. P. M. went to the max and made some bad noises at idle so i shut the truck off and had a look didnt see nothing but starter will not turn over engine it just sits there and spins. How do you tell?

 

[lmills]

sounds like a flex plate. what level were you running the tst on when it happened?

 

[J.Davy]

setting 5 on h. p. & 3 on T. Q. It was a icy long pull with patches of dry ashphalt I think I spun and grabbed on a dry patch. What is the worst case scenario for internal damage?

 

[lmills]

I forget who, but someone else broke one the other month. I think the only damage was the flex plate itself. The reason I am thinking the flexplate is because you said the motor will not crank over.

 

[DPKetchum]

Sounds like flex plate. darn First generations broke them also. HUMMM

 

[J.Davy]

I only hve 2200 km on the truck. Its a little discouraging that they can break that easy. Who makes a better one?And what are they worth?

 

[lmills]

most of the aftermarket transmission manufacturers are selling billet flexplates, but they are high dollar. (around $700) to name a few suncoast, ats and dtt

 

[ceaman]

A friend of mine just put in a new gorend brothers torque converter and he had a flexplate reinforcement that welded in place around the outer bolt holes (tq bolts). I thought it would be a cause of vibration, being welded freehand, but doesnt seem to be an issue.



I can ask where to get one to be sure but I would check these two places.



http://www.haisleymachine.com/



http://www.gbtransmissions.com/

 

[TCDiesel]

The ATS T/C will fix the flexing up to 450 HP MAX, after that I would upgrade the plate. The stocker should have held without any Mods. RTD

 

[J.Davy]

What is the purpose of the flex plate? If I change it to a stronger one will I compromise something else?

 

[TCDiesel]

What is the purpose of the flex plate? If I change it to a stronger one will I compromise something else?

Yes,the input shaft good be the weak link during lockup,Also you may get strange vibrations. A upgraded TC/VB will solve the Problem, Pm your Phone # and I will give you details. Or contact us at www.tcdieselperformance.com.If you upgrade you will get other benefits.

 

[robertyoke]

the reactor/dtt flex plt is more like 500 bucks not 700. piers sells a heavy steel for under 200.

Don't make the mistake I made, put in the ats tc then couple thousand miles later I did the reactor flex plt and billet input, that's one more time of pulling the trans and puting it back in, do I all at once if you can swing it.

 

[Bob Wagner]

fix'n the link

should be http://tcdieselperformance.com

 

[J.Davy]

I have all the internals on the way from D. T. T. , I ordered the stuff a few weeks back but never ordered a flex plate. I will definatley order one now. I am surprised that not one of the manufactures emphasized putting a stronger one in. I guess it must not be all that common in the the third gens. I am glad it broke before I swaped all the new stuff in there. I just hope it didn't break anything else. Thanks for all the info guys I appreciate the help.

 

[lmills]

the reactor/dtt flex plt is more like 500 bucks not 700. piers sells a heavy steel for under 200.



Don't make the mistake I made, put in the ats tc then couple thousand miles later I did the reactor flex plt and billet input, that's one more time of pulling the trans and puting it back in, do I all at once if you can swing it.

Sorry my fault. As you can see i am a 6 speed guy. I got that number from a friend that recently did a full DTT upgrade on his 48re. He must have quoted me the wrong number. :-laf



I definitely agree. If your gonna drop the drop the transmission, try to do it all at once.

 

[Floor It]

You'll be WAY HAPPY! with the DTT stuff.



John

 

[roadking]

let dc fix it under warranty

 

[J.Davy]

Apparently it is not to common for these things to break and there might be other issues leading to its destruction besides something I might have done. I will find out later today or tomorrow.

 

[BCarmicle]

I broke my flex plate a couple of months. I could hear it bending at 500hp, then added the twins and it finally let go.



Your input shaft also has a good chance of letting go so I suggest your upgrade it too if you were debating on that.

 

[jsimpson]

I only hve 2200 km on the truck. Its a little discouraging that they can break that easy. Who makes a better one?And what are they worth?

Be glad it was the flex plate. I talked to a DC engineer who told me that the scenario you experienced on ice with a sudden grab of traction is the worse shock load you can put on your drive train. Think of the flex plate as a fuse. That's the cheapest fuse in the drivetrain!