09-21-2021, 07:31 PM | #1 |
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Join Date: Jul 2017
Location: FL Born, UT Living
Posts: 139
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4l80e Question
Not too familiar with the 4l80e that ran behind a 6.5 diesel but I was wondering it I can use it for a swap.
There's a 01 2wd 4l80e for sale locally and I was trying to determine if it was possible to just switch the tail housing to a regular 2wd TH or would the input shaft will have to be replaced as well? Attached are some stock photos of a 4l80e that are used behind a 6.5 diesel..
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09-21-2021, 07:37 PM | #2 |
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Join Date: May 2004
Location: Binghamton, NY
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Re: 4l80e Question
If using it for a 2wd, then cant see why it wouldnt work. Unbolt the brake BS, should be the same. But, never messed with em either....
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09-22-2021, 12:19 AM | #3 |
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Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
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Re: 4l80e Question
There is a bolt in the center of the tailshaft yoke, remove it and the six tail housing bolts and the tail housing with brake assembly should slide back and off the tail shaft. The tail shaft lengths are the same. The short tail housing will bolt right on, "however"...You will have to double check the slip yoke end play clearance in relation to u-joint position. In other words, the tail shaft with the bolt on yoke is not clearanced for the longer slip yoke used on Single Rear Wheel axles. There needs to be at least 3/4" end play on the slip yoke to allow the suspension to extend and collapse while maintaining a full bite on the splines. I'm in the middle of this exact swap with a 3L80 (400THM) and a 475THM used in motorhomes and heavy trucks...Pics for reference...The lower tail shaft is the slip yoke shaft, the upper pic is the 475 shaft w/bolt on yoke. Notice the location of the o-ring groove in relation to the splines. Do not cut your slip yoke! Simply have a machine shop bore the end of the slip yoke 1" and your golden...
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09-22-2021, 01:27 AM | #4 |
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Join Date: Mar 2003
Location: Colfax-California
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Re: 4l80e Question
If there is a hole in the end I would look into using a fixed yoke
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09-22-2021, 07:19 AM | #5 |
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Join Date: Oct 2009
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Re: 4l80e Question
That unit is from a C3500HD or P chassis truck. The 1 ton and smaller trucks had a standard slip yoke and tail housing. Because of that parking brake setup, it currently has a fixed yoke.
You can take off all of the brake stuff and use a driveshaft that slips, or swap tail housings and use a slip yoke. Like previously stated, the output shafts are the same. |
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