simple 4l80 question

Six-is-Enough

Six-is-Enough

Use to do a little Boost
Re: simple 4l80 question

George and Jeff kick ass:rock: . Great info on the shafts and I glad you guys helped me with my truck!
 
George Blake

George Blake

DONATING MEMBER
Re: simple 4l80 question

I love that video. :tup: It makes me cringe every time I see it thinking about what it's doing to the viscous in the transfer case :rotf: Jeremy is a driving fool! :p
Ed I'm serious about letting me machine you up a shaft. I'm sure Rossler won't mind putting it in. Let me know.
That area could be shotpeened though. There is a place over in Westchester that does that kind of work. I know GM is doing on their 4L70 stuff. The shaft must "give" some and snap back at the base of the splines. The way the Fitzall shaft is done, it makes it very brittle at the "give" joint. I don't mean to beat a dead horse but your not done yet Ed if you want to give it a shot if this one breaks. Send me the old shaft so I can get dimensions and I'll see if I can do one so you can have it sitting on the shelf in case something happens.
 
ed hess

ed hess

race or get outta the way
Re: simple 4l80 question

George Blake said:
Ed I'm serious about letting me machine you up a shaft. I'm sure Rossler won't mind putting it in. Let me know.
Click to expand...

george

A replacement shaft is allready being installed.

I will take you up on this when this one breaks or perhaps before that and sit it on the shelf for when i need it since we know this one wont last.

i would assume i can send you the broken one to use for reference.

ed
 
HotRodV6

HotRodV6

Doghouse Member
Re: simple 4l80 question

Has anybody thought about cryo treating the shaft to improve the grain structure and stress relieve the shaft, that way its not so prone to breakage??

Just thinking out loud here. Ive been thinking about the 4L80E conversion fo rwhen my trans goes south, spend the money once and be done with it.
 
JSM

JSM

Active member
Re: simple 4l80 question

HotRodV6 said:
Has anybody thought about cryo treating the shaft to improve the grain structure and stress relieve the shaft, that way its not so prone to breakage??

Just thinking out loud here. Ive been thinking about the 4L80E conversion fo rwhen my trans goes south, spend the money once and be done with it.
Click to expand...

Yep, and it is an option I know George offers.
 
George Blake

George Blake

DONATING MEMBER
Re: simple 4l80 question

The first series I ran, I did them all that way. I used to offer without if a customer wanted them cheaper. On the 4L80E conversions I do now, it's standard. It's a relatively inexpensive process and no point in running the risk. Cryo is REALLY good after a component has been heat treated or welded.
 
ed hess

ed hess

race or get outta the way
Re: simple 4l80 question

i just finished puttin trans and xfer case back in.

keith stopped by and after he looked at the broken shaft he told me it wasnt a welded shaft. he also said the splines were begining to twist which i thought also.

in the big scheme of breakin stuff this probly wasnt to bad.

out pocket for the shaft, next day air, and harry's guy to put it in was 500.

internals on the 400 were like new. guy actually said "PERFECT".

So i guess having 3 tranny coolers on it may help out after all.

ed
 
George Blake

George Blake

DONATING MEMBER
Re: simple 4l80 question

Send it to me, I'll let you know. Your truck doesn't weigh enough put enough stress on the TH400/4L80e(they are the same in the tail end) to do anything to the clutches or hard components. You could've got by with one cooler. I'll eventually put some comparison pics up of the internals so you can see the difference. Once guys that are running really low numbers see the difference, they'll understand what you figured out already. There is no comparing a 700 to a TH400/4L80E gear train and clutch system.
 
TheNeek

TheNeek

this is my serious face
Re: simple 4l80 question

Jeff, is that COSMOS (from solid works) that you used for failure analysis? Nothing like the right tool for the job eh? I get a stiffy looking at solid models and Von Mises stresses.

Are you all thinking of machining this thing out of a solid billet piece? What temper and grade steel are you looking at? I love these engineering threads.

Jeff -- Can I get a copy of that solid model if you use Solid Works 04 or older? m42power@bimmerboys.com
 
JSM

JSM

Active member
Re: simple 4l80 question

I do have cosmos but that was not done with it.

I honestly don't see the shaft as a big problem for 99% of the trucks and owners.

The cost to do billet would be crazy stupid in the qty's I could manufacture/sell.

The other thing is, if I was going to have a weak spot, this is almost the perfect place to have it as it will not cause any other damage and is fairly cheap to fix. Again for the 1% that might stress it to that point.

As far as Ed's shaft he broke, there is still debate on it being welded or not. Until I see pictures of what the break looks like I can't decide myself. I do know some aftermarket shafts being sold ARE welded, just not sure if his was or not personally.

I talked to Robert the other day from Sweden about his 4l80e. He has like 1k runs on his output shaft without issues and it is done in the same way as the ones George and I have offered.
 
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