drive shaft??

[mooseknuckles]

just wondering what I would need for a yolk for my 4l80e? is it the same as a th400?....and how much longer is the 4l80e trans than a 700r4 trans?

[code4]

Originally Posted by mooseknuckles

just wondering what I would need for a yolk for my 4l80e? is it the same as a th400?....and how much longer is the 4l80e trans than a 700r4 trans?

yes, same as t400 as far as spine. not sure how much longer it is.

[83 Silverado]

If you go on the TCI trans site you can find a chart with the langths http://www.tciauto.com/tc/trans-dim

[mooseknuckles]

cool link thanks man.

[nacho55]

After you find out the spline count and length you need hit the junkyard as I found tons of good ones at my local pickapart when I was scrounging for my driveline setup, even with having it shorten and re-balanced I have less than 150.. you almost can't get a yoke for that. And those are the big 32spline ones that are pretty tough and most of the ones I found were like new or just had a little surface rust that comes off with steel wool or sandpaper.
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[mooseknuckles]

Originally Posted by nacho55

After you find out the spline count and length you need hit the junkyard as I found tons of good ones at my local pickapart when I was scrounging for my driveline setup, even with having it shorten and re-balanced I have less than 150.. you almost can't get a yoke for that. And those are the big 32spline ones that are pretty tough and most of the ones I found were like new or just had a little surface rust that comes off with steel wool or sandpaper.
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think its a 32 spline...how do I find the length?

[nacho55]

Not sure but if it's like the one use which was out of a later truck it was 4-5" if I remember there's not alot of differnt sizes so you can't go to wrong if your a little long. The yoke can be shortened too. but the important thing is that when you install the yoke into the transmission you have 3/4" to -1" of travel for the yoke to slide in and out. That's how the driveline shops measure for it so it doesn't bottom out. Do you have a drive shaft your trying to use or? If not just find the yoke and start from there.
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[clinebarger]

Are you using a bolt-on yolk or a slip yoke?

[mooseknuckles]

Originally Posted by clinebarger

Are you using a bolt-on yolk or a slip yoke?

slip yolk...I don't have anything right now.....

[nacho55]

Moose,
Are you planning on buying new yoke and getting a driveline built? If your searching for yokes new try to match it with the same size ujoint that your rear takes it will save you the trouble of having two different ones when it comes time to replacing ,
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[mooseknuckles]

Originally Posted by nacho55

Moose,
Are you planning on buying new yoke and getting a driveline built? If your searching for yokes new try to match it with the same size ujoint that your rear takes it will save you the trouble of having two different ones when it comes time to replacing ,
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yeah...gotta buy one..apparently there's 3 or 4 different ones, and I can't get an answer on anything..I'm using the stock two piece driveshaft so it may have to be shortened.....

[nacho55]

Check the output shaft of the transmission, if it has a threaded hole it was a bolt on yoke and you will need a special one, if not threaded you can just order a long 32spline with the ujoints that match your current driveline but your most likely going to have to shorten one of you lines because I think the 4l80e is longer that the 700r4 and definitely longer than a th350 or 400. This is also dependant on your engine placement. Have you measured what driveline you have now to see how close it is?
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[mooseknuckles]

I just did a rough measure and thought it might be close...but I'll have to check again...the trans def has a hole in the output shaft.....

[clinebarger]

Originally Posted by mooseknuckles

slip yolk...I don't have anything right now.....

Ive never seen a 4L80E have a slip yoke, Unless someone put a TH400 output shaft in it.....Use a Bolt-on yoke....You already have a Slip Yoke in your drive shaft (circle)

[mooseknuckles]

...so where do i find one of those?

[clinebarger]

Originally Posted by mooseknuckles

...so where do i find one of those?

Im curious to know why its missing, Remove the tailhousing & make sure the O-ring is there...If it is Replace the O-ring.
If the O- ring groove/seat for the bolt-on yolk has been machined off, Ive seen ouput shafts that someone took a grinder to them also.......You have to run a slip yoke.

Point is....Check out whats going on before you buy parts.

Ive thrown Bolt-on TH400/4L80E yolks away because I was tired of tripping over them. The TH400/4L80E slip yoke is rare in good used shape.

Hit some local transmission shops after you know whats going on.

[mooseknuckles]

so..bolt on or slip?

[clinebarger]

Originally Posted by mooseknuckles

so..bolt on or slip?

Just from outside looks & the fact 4L80Es had a bolt-on yolk......I would say Bolt-on, I was just recommending checking before buying.

[Gordonr1973]

http://ls1tech.com/forums/automatic-...uestion-2.html

Here is some more conversation regarding this ... and I'm not yolking either!

lol!

[Gordonr1973]

Not really sure either what I am going to go with, just didn't like the driveshaft shop quoting me $500 to build me a new drive shaft from scratch!

A few more links, not sure which applies to your situation with the two-piece.

http://www.chevyhiperformance.com/te.../photo_01.html

http://www.ebay.com/itm/NEW-DRIVESHA...sories&vxp=mtr

http://www.summitracing.com/parts/IED-SY-400-1310

http://www.performancetrucks.net/for...o-i-do-486687/

http://www.chevyhiperformance.com/te.../photo_01.html

[Dustytrix]

I have a bolt on type that has the u-joint bolt on clamps. They are missing tho, let me know if you think you can use it.

[usmcchevy]

Not that it means anything, but my 4L80E came with a factory slip yolk.