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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => LT/LS Swaps => Topic started by: lstoold on February 12, 2017, 05:40:09 PM

Title: 4l80e for 85 chevy 4x4
Post by: lstoold on February 12, 2017, 05:40:09 PM
 i would like to swap engine 6.0 vortec  and 4l80e to my transfer 208c .i have feel question would ask,what vehicle i am look for 4l80e 4x4 at upull ?to make it work with my 208c.. any parts i need to buy.thanks for help
Title: Re: 4l80e for 85 chevy 4x4
Post by: VileZambonie on February 12, 2017, 05:57:33 PM
 :o
Title: Re: 4l80e for 85 chevy 4x4
Post by: lstoold on February 12, 2017, 09:06:44 PM
i know my question is old ,hope your guys help.or give me the link
Title: Re: 4l80e for 85 chevy 4x4
Post by: bd on February 13, 2017, 09:10:18 AM
I think he is asking, which junkyard vehicles have a 6.0 L Vortec/4L80E combo that will directly mate up with an NP-208C, and what other parts will he need to complete the swap?
Title: Re: 4l80e for 85 chevy 4x4
Post by: Irish_Alley on February 13, 2017, 08:27:11 PM
i know my question is old ,hope your guys help.or give me the link

this part reads

i know my question is odd, hope you guys can help or give me a link.

you need a 208 or 241 that has an electric speed sensor much like what you would find on a 89-91 burb and blazer. but the issue is those should come with 700r4s and they will have 27 splines and that would make the 241 off them 27 splines. so you would have to swap that with a 32 spline 208 input shaft. you will need 32 for the 4l80e. if your trans is the th400 that will be a 32 spline
Title: Re: 4l80e for 85 chevy 4x4
Post by: lstoold on February 14, 2017, 03:16:54 AM
can i keep my 208c and  buy new input shaft 32 spline?
Title: Re: 4l80e for 85 chevy 4x4
Post by: Captkaos on February 14, 2017, 08:08:28 AM
You will need an adapter for the transfercase. 
Title: Re: 4l80e for 85 chevy 4x4
Post by: lstoold on February 14, 2017, 11:15:34 AM
what year of the truck i am look for adapter to fit 4l80e to 208c?
right now i got adapter 700r4 to 208c.sorry i know ask too much because i am want learn one i got all information i will bring my truck back to life, thanks
Title: Re: 4l80e for 85 chevy 4x4
Post by: Irish_Alley on February 14, 2017, 01:01:16 PM
cant answer that, i know the th400 is the same pattern as the 4l80e but theres an issue with the shifter. go to advanceadapters.com and see what they have for sale for that setup
Title: Re: 4l80e for 85 chevy 4x4
Post by: Captkaos on February 15, 2017, 07:59:20 AM
you won't find a factory adapter for it.  You have to look at Advanced Adapters.
Title: Re: 4l80e for 85 chevy 4x4
Post by: lstoold on February 15, 2017, 10:00:27 AM
ok thanks,
Title: Re: 4l80e for 85 chevy 4x4
Post by: lstoold on February 15, 2017, 10:12:37 AM
here i will do,i go to u pull and look for chevy truck  k2500 4x4 if it had 4l80e and 241 transfer case i bring it home together.hope i can find one
 
Title: Re: 4l80e for 85 chevy 4x4
Post by: Irish_Alley on February 15, 2017, 10:23:43 AM
prob wont happen. 4l80e came out in 91 only passengers side drop got a 205.
Title: Re: 4l80e for 85 chevy 4x4
Post by: Captkaos on February 15, 2017, 10:48:45 PM
1 year only for a 241 drop and 4l80e.

Chris Lucas
73-87chevytrucks.com
squarebody.biz

Title: Re: 4l80e for 85 chevy 4x4
Post by: Irish_Alley on February 16, 2017, 02:13:14 PM
Cap what did the 241 and 4l80 some on? the only thing i knew of was the crew cab and that was a 205
Title: Re: 4l80e for 85 chevy 4x4
Post by: Captkaos on February 17, 2017, 07:47:28 AM
1991, 1 year only.
Title: Re: 4l80e for 85 chevy 4x4
Post by: hatzie on February 17, 2017, 07:57:24 AM
The NP208C from a TH400 or SM465 transmission truck will mate up to the NP24x & NP26x extension housings on the 4L80E used in the T400 & T800 chassis trucks... 
The six bolts are not evenly spaced. One is offset to key the clocking position of the transfer case.  The LS powered GMT800 rigs are Left Hand Drop the 73-91 CK RV squares are Right Hand Drop so the clocking position will not work even if you are OK with just using four or five of the six bolts.  Advance Adapters, and I believe Novak, make clocking rings.  One or both probably have LHD to RHD correcting clocking rings or a custom transmission tail housing that will allow you to install the RHD case with all six bolts.

The TH350, TH700R4, & 4L60 have 27 spline output shafts.  The SM465, NV4500, and TH400 have 32 spline output shafts.  I believe the 4L60E is 32 spline as well unlike the non electronic 4L60.  If your NP208C came from one of the 27 spline transmissions you'll need a new input sleeve/gear.

JTR (Jags That Run) should have a VSS adapter that will allow you to keep your cable speedometer and still run the LS motor. 

Irish
Didn't some of the 1991 3/4 ton Suburbans come with the NP241 & 4L80E?  Scarce as hens teeth...
Title: Re: 4l80e for 85 chevy 4x4
Post by: lstoold on February 21, 2017, 03:28:58 AM
Bad day for me can not find any 241 u pull ,and no engine 6.0 too .....i saw some 5.3 but i keep looking.
Title: Re: 4l80e for 85 chevy 4x4
Post by: hatzie on February 21, 2017, 10:56:29 AM
The LQ4 6.0L LS has is 325HP.  The LQ9, if you can find one, makes 345hp.  They are also a high demand item.

You can get to 320HP with the 5.3L with almost no effort and the 4.8 can make decent HP.  Similar to the 283 vs 327 smallblocks.
Title: Re: 4l80e for 85 chevy 4x4
Post by: Captkaos on February 22, 2017, 09:34:46 PM
you might as well be looking for gold trying to find a 241 for a 73-87(91).
There is nothing wrong with any LS setup, from 4.8L, 5.3L or 6.0L.  All will make more power than the SBC that was in there as hatzie pointed out.