4L80E/NP205:Anyone done this? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**special-K** · 05-05-2005, 09:48 AM

I~m checking into this possibility before I commit to a 700r4 swap.I have a`91 3/4t Suburban with the 4L80E/NP241.It has a stand alone ECM for the trans since it is a mechanically injected 6.2 diesel.So electronically it would be possible.I`m not using this vehicle as the donor,just saying there is such a set-up.Street rodders are using the 4L80E,too.So,there`s a computer available.Is there an adapter for the NP205,though?The NP241 is the next best thing and could be found coupled with this transmission.I`m exploring right now.Any input appreciated.

*gn4u2c* · 05-05-2005, 12:52 PM

I am sure that can be done. Anyone have one out you can try to match up with thats a good idea !!

bgeraurd · 05-05-2005, 12:57 PM

4l80e/np205 came in the 91 crew cab 4x4 trucks

Russell · 05-05-2005, 02:17 PM

Yep, it can be done, and as bgeraurd mentioned, it actually came stock on some of the crew cab trucks with the solid front axle

**Richard** · 05-06-2005, 01:57 AM

You need a stock TH400 adapter, for the "race track" style 205 with the 32s female input. The index ring on the adapter needs to be machined a few thousandths to fit the tranny and the output shaft needs to be changed to a full spline version out of a motorhome so it can be cut to length. I not really sure about the difference between the 2wd and 4wd versions of the 4L80E other than the 4wd version not using a tailshaft. But I was told to use the 2wd version. BTW I have an extra new adapter machined and ready to go. Shoot me a message if interested.

05-05-2005, 09:48 AM	#1
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	4L80E/NP205:Anyone done this? I~m checking into this possibility before I commit to a 700r4 swap.I have a`91 3/4t Suburban with the 4L80E/NP241.It has a stand alone ECM for the trans since it is a mechanically injected 6.2 diesel.So electronically it would be possible.I`m not using this vehicle as the donor,just saying there is such a set-up.Street rodders are using the 4L80E,too.So,there`s a computer available.Is there an adapter for the NP205,though?The NP241 is the next best thing and could be found coupled with this transmission.I`m exploring right now.Any input appreciated. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

05-05-2005, 02:17 PM	#4
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Yep, it can be done, and as bgeraurd mentioned, it actually came stock on some of the crew cab trucks with the solid front axle __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

05-06-2005, 01:57 AM	#5
Richard Senior Member Join Date: Dec 1999 Location: Southern California Posts: 2,881	You need a stock TH400 adapter, for the "race track" style 205 with the 32s female input. The index ring on the adapter needs to be machined a few thousandths to fit the tranny and the output shaft needs to be changed to a full spline version out of a motorhome so it can be cut to length. I not really sure about the difference between the 2wd and 4wd versions of the 4L80E other than the 4wd version not using a tailshaft. But I was told to use the 2wd version. BTW I have an extra new adapter machined and ready to go. Shoot me a message if interested. __________________ Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 Last edited by Richard; 05-06-2005 at 02:01 AM.

05-05-2005, 12:52 PM	#2
gn4u2c Account Suspended Join Date: Mar 2003 Location: southern pa Posts: 698	I am sure that can be done. Anyone have one out you can try to match up with thats a good idea !!

05-05-2005, 12:57 PM	#3
bgeraurd BLAZERHOLIC Join Date: Jan 2005 Location: Avondale, AZ Posts: 64	4l80e/np205 came in the 91 crew cab 4x4 trucks



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