Allison 6sp: Built Transmission, now needing some help

[Chevy1925]

well theres your problem. broke the input shaft

 

[Mike L.]

well theres your problem. broke the input shaft

Time for a billet shaft.

 

[WolfLMM]

It never changed

Damn

 

[Mr. Goodtime]

Check line pressure. Pull the plug next to the spin on filter, put a good sized pan under the hole where you removed the pressure plug. Start engine in park, and rev it to about 2,000 rpm for a couple of seconds. Fluid should gush out. Shut off engine right away. If you don't get a gusher, your pump is hurt.

I didn't even have to Rev it up and it was gushing out.

 

[Mr. Goodtime]

Time for a billet shaft.

Well I guess he was right then. Time to place an order. Thanks everyone for your help.

 

[SmokeShow]

Has anyone had an input failure at speed? I'd figure it'd happen at a dig with a shock load. I guess if you exceed its strength with torque it's apt to bow out.

What torque are they typically "safe" to?

 

[Chevy1925]

Has anyone had an input failure at speed? I'd figure it'd happen at a dig with a shock load. I guess if you exceed its strength with torque it's apt to bow out.

What torque are they typically "safe" to?

they are kinda a "they break or they dont" type deal. i know most recommend above 800hp to put one in but below that, its hit or miss. Mike has said in past, on the ones that break at lower hp, looking at the break, it seems hardening didnt go deep enough into the shaft.

 

[Mike L.]

Been quite a few inputs broken at speed. If you have the power, and the converter is locked and you break the tires loose at speed; as soon as the tires hook, the shaft tends to break.

 

[hondarider552]

Knock on wood I have stock shafts in my trans :roflmao:

 

[Mike L.]

Knock on wood I have stock shafts in my trans :roflmao:

So did McRat in Casper.

 

[JoshH]

Knock on wood I have stock shafts in my trans :roflmao:

You have wood shafts?

(That's what she said! )

 

[Mr. Goodtime]

Has anyone had an input failure at speed? I'd figure it'd happen at a dig with a shock load. I guess if you exceed its strength with torque it's apt to bow out.

What torque are they typically "safe" to?

I was at speed when this one let go. Mike described it perfectly, I had broke loose then when it went to go it's like it slipped into neutral. Had nothing

 

[superswamper003]

How many miles are on your truck OP?

 

[Mike L.]

Knock on wood I have stock shafts in my trans :roflmao:

Weight makes a big difference Brian.

 

[Mr. Goodtime]

How many miles are on your truck OP?

Just turned over 90k on it

 

[mike diesel]

My billet shafts have been great. 1000whp, 7000lbs, probably a couple hundred 50 mph+ rolling burnouts catching rediculous traction mid way through.

 

[C.bowles2]

Hey everyone im having this identical problem. Like exactly,and i cant seem to find the right pids to monitor input and output speed and turbine speed on efi live scan tool. Im thinking broken input but i hope not. This trans was in matt misners race truck and supposedly held very high hp. But does have the stockers in it




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[Mike L.]

Hey everyone im having this identical problem. Like exactly,and i cant seem to find the right pids to monitor input and output speed and turbine speed on efi live scan tool. Im thinking broken input but i hope not. This trans was in matt misners race truck and supposedly held very high hp. But does have the stockers in it




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Pull up the turbine speed sensor. It better read 0 at a standstill while in gear. If it reads RPM speed like the tach; you have a broken input shaft.

 

[C.bowles2]

Woukd tccslip be turbine?




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[C.bowles2]

Ok i had to validate pids, turbine speed stays zero but also stays zero when revving it up?




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