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Need 4340 or 300M Input shaft for C6?

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Gregaust
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Fordaholic495
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Need 4340 or 300M Input shaft for C6? Empty Need 4340 or 300M Input shaft for C6?

Post  Fordaholic495 June 21st 2018, 2:22 pm

78 bronco, 4700-5000 lbs, 300 ft sand drag truck/occasional street driver, getting a 552 BBF with something like 700hp and 725+ ft/lbs. Needs to hold up to a trans brake, even though most of the time I will be foot braking it.
Is an upgraded input shaft necessary here and if so, where do you guys get yours from? Will obviously be real easy to do when I have everything out.

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Post  norm June 21st 2018, 7:25 pm

I ran a stock one for a long time and never broke one, 5000lbs with a brake, A head 598.

Last time trans was freshened we put a good one in for piece of mind but i don't recall the brand.

PM J.Toney on here and he can tell you what brand, probably any of the aftermarket ones will do the trick.
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Post  Gregaust June 22nd 2018, 5:15 am

Frank suggests over 800 ftlb to upgrade . I've used a few TCI ones been ok

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Post  Fordaholic495 June 22nd 2018, 6:41 am

Damn these c6’s are pretty tough! I’ll leave it alone for now, thanks guys!

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Post  Gregaust June 23rd 2018, 2:43 am

Fordaholic495 wrote:Damn these c6’s are pretty tough! I’ll leave it alone for now, thanks guys!

I'm guessing on sand ? traction is limited ? I'd say the stock input will do ok:)

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Post  norm June 23rd 2018, 8:57 am

Paddle tires hook up better than you would think but for the most part yes, just spinning.
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Need 4340 or 300M Input shaft for C6? Empty ATI

Post  manofmerc June 28th 2018, 5:15 am

I bought one from ati you have to call them it isn't in the catalog it is the 300m material .The only broken c-6 input shaft I have seen was out of my 66 comet street car .Probably metal fatigue .Doug

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Post  68formalGT June 28th 2018, 2:13 pm

I bought a 300m shafts from Broader. 3 years ago it was $175.
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Post  Colt Macara July 8th 2019, 10:12 pm

PATC 300M C6 INPUT SHAFT

PA FROM SUMMIT C6 INPUT FROM SUMMIT

TCI TCI C6 INPUT SHAFT

HUGHES @ JEGS 4340 C6 INPUT


Last edited by Colt Macara on July 8th 2019, 10:40 pm; edited 2 times in total (Reason for editing : ADDED TCI SHAFT)
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Post  J.Toney July 10th 2019, 8:19 am

NA or power adder? IMO, you'll probably get along fine with stock shaft at the NA level. But I might add it for a buffer if extra power shows up one day. I and Norm had gotten by with factory shafts in very similar apps for many seasons. Personal stuff was 521"/700h/650tq/5k with small plate kit, on transbrake, using smallish 17 paddle Hookers.
I will be upping power soon, and a upgrade shaft will be going in.

I've gotten them from Transtar, not sure who they use.  Norm's was a few years back, can't recall for sure where it was sourced.  All I've used seem to fit and hold well.  But prefer TCS Arizona if possible, TCS Canada is a great product also.
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Post  Gregaust July 11th 2019, 4:21 am

Just remember also to check which you have . There are two types , a 31/31(early) & a 31/30 (later)

Converter ends are same , it's the forward drum end is different

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