Will a 1996 k2500 4l80 fit in my 1998 k1500 with a 4l60 both trucks have the light duty rear end one is a 6 lug the 96 is a 8 lug parts truck with a rebuilt 4l80. I have 2 14 bolt heavy duty full flouters rear ends out of a 1996 hd parts truck I bought to make a k2500hd out of the k1500 but I would like a 4l80 in it. I buy wrecks from Copart for parts.
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4l60 swap to a 4l80?
- Thread starter Mike's 52
- Start date
Will L.
Well-Known Member
Yes but it will require more modifications than just swapping them.
The transmission mount will be relocated as will the transfer case swapped or modified by changing the input shaft from 27 to a 32 tooth. This also leads to drive shaft modifications. I remember you shorten the rear shaft 1.5-2” but can’t remember how the front shaft gets altered but it does.
You need the entire shifting linkage assemblies for both trans and transfer case.
The neutral safety switch grouping and the transmission lines also but best is go to aftermarket tranny cooler. The line & cooler size is different in many trucks between them and gm later figured out the factory was undersized in the older ones.
For the controller- people used to go through a bunch of chaos modifying the ecm. Don’t, it still ends up with headaches on the 4wd. Just buy an aftermarket controller. Leroydiesel.com has a good one.
Know that the engine rpm will be a little higher on the freeway in overdrive by 5% iirc.
A couple while you are at it things- drain plug in the new trans pan for service ease and the reuseable gasket & new filter.
Put a new chain & shifting fork pads in the transfer case while it’s out of the truck, unless you can do the dream of all transfer case dreams and get an Atlas in there.
Out of interest-What engine? We all enjoy truck pics…
The transmission mount will be relocated as will the transfer case swapped or modified by changing the input shaft from 27 to a 32 tooth. This also leads to drive shaft modifications. I remember you shorten the rear shaft 1.5-2” but can’t remember how the front shaft gets altered but it does.
You need the entire shifting linkage assemblies for both trans and transfer case.
The neutral safety switch grouping and the transmission lines also but best is go to aftermarket tranny cooler. The line & cooler size is different in many trucks between them and gm later figured out the factory was undersized in the older ones.
For the controller- people used to go through a bunch of chaos modifying the ecm. Don’t, it still ends up with headaches on the 4wd. Just buy an aftermarket controller. Leroydiesel.com has a good one.
Know that the engine rpm will be a little higher on the freeway in overdrive by 5% iirc.
A couple while you are at it things- drain plug in the new trans pan for service ease and the reuseable gasket & new filter.
Put a new chain & shifting fork pads in the transfer case while it’s out of the truck, unless you can do the dream of all transfer case dreams and get an Atlas in there.
Out of interest-What engine? We all enjoy truck pics…