Author Topic: Future LS swap question  (Read 1935 times)

Offline Cotton27

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Future LS swap question
« on: September 21, 2017, 04:59:46 PM »
I'm planning on a 6.0 swap this winter and would like to know what tranny would be best to put behind it. It will be going into an 85 k10 4x4 with a 208 transfer case. From what I've read a 4l65,70 or 80 will work.

Offline nucknoel89

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Re: Future LS swap question
« Reply #1 on: September 22, 2017, 12:04:15 AM »
I'm planning on a 6.0 swap this winter and would like to know what tranny would be best to put behind it. It will be going into an 85 k10 4x4 with a 208 transfer case. From what I've read a 4l65,70 or 80 will work.
I may be wrong but I've heard that on the newer transmissions the transfer case is on the opposite side. My truck is 2wd so I didn't have to worry about it.

Offline hwh

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Re: Future LS swap question
« Reply #2 on: September 22, 2017, 08:01:55 AM »
4l60e or 4l80e would be my choice

Offline ehjorten

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Re: Future LS swap question
« Reply #3 on: September 22, 2017, 08:27:12 AM »
I think GM originally put the 4L60e behind the 4.3L, 4.8L, and the 5.3L, but if it was a 6.0L it got the 4L80e.  I am sure there are exceptions.  There are slight wiring differences to the transmissions between the 4L80e and the 4L60e, so I would suggest finding a wiring harness for the LS that matches your transmission of choice.  Given the option I would choose the 4L80e.  I think you will find that there is only a few hundred dollars difference between the 2 transmissions depending on where you pick one up.
-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6

Offline Cotton27

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Re: Future LS swap question
« Reply #4 on: September 22, 2017, 01:42:47 PM »
Thank you. I just want to get everything figured out and done with the least amount of headaches.

Offline nighthawker5

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Re: Future LS swap question
« Reply #5 on: October 01, 2017, 01:24:31 PM »
I have a 6.0, 4L80e and an NP205 with a passenger side drop.  Everything bolted up just fine i just had to move the cross member for the transmission back. 

Offline roundhouse

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Re: Future LS swap question
« Reply #6 on: October 02, 2017, 10:47:42 PM »
Get the engine and Trans together from the same donor vehicle
Theres a lot of variations in electronic stuff
If you get a engine from from donor and a Trans from another they probably won't play well together



Also , the NV 3500 and 4500 manual transmissions work with a 208

We have the 3500 behind a 5.3 and it's a blast to drive
Lot more fun than an automatic that's always in the wrong gear