6L80 trans with a NP205? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chas350 · 05-22-2009, 08:44 PM

Anyone done this in a 67-72? I know Speartech did a 2wd in a 2001, but has anybody heard of this swap?
It would be pretty cool having a 6 speed auto with a 5.3 gen111 in a 67-72 4x4 with like 4.10 gears! Gas mileage and power!

1969 GMC · 05-22-2009, 11:33 PM

i don't know anything about these cases, but if they have a 32 spline output shaft with a round pattern on the tailhousing, then it could be made to work.

chas350 · 05-26-2009, 09:47 PM

Not sure what the spline count is.
Anyone something about this tranny?

Quote:

Originally Posted by 1969 GMC

i don't know anything about these cases, but if they have a 32 spline output shaft with a round pattern on the tailhousing, then it could be made to work.

72blue · 05-27-2009, 12:22 AM

Im sure an adapter could be had, but for the $, u could buy a lot of gas.

**special-K** · 05-27-2009, 05:43 AM

If the 6L80E bolts to a 32 spline NP241 then it can be done with a late-model NP205 with same pattern/spline count.I don`t know what`s in the late trucks,though.

05-22-2009, 08:44 PM	#1
chas350 Registered User Join Date: Mar 2007 Location: Connecticut Posts: 581	6L80 trans with a NP205? Anyone done this in a 67-72? I know Speartech did a 2wd in a 2001, but has anybody heard of this swap? It would be pretty cool having a 6 speed auto with a 5.3 gen111 in a 67-72 4x4 with like 4.10 gears! Gas mileage and power! __________________ "I'll Procrastinate Tomorrow" quote by LEEVON 71 K10 long fleet (sons truck) new 370hp 355, sm465 np205, 3.73's 33's 70 K20 long fleet 98 G3500 work van

05-22-2009, 11:33 PM	#2
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	Re: 6L80 trans with a NP205? i don't know anything about these cases, but if they have a 32 spline output shaft with a round pattern on the tailhousing, then it could be made to work. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

05-27-2009, 12:22 AM	#4
72blue Registered User Join Date: Feb 2009 Location: arroyo grande, ca Posts: 206	Re: 6L80 trans with a NP205? Im sure an adapter could be had, but for the $, u could buy a lot of gas. __________________ James

05-27-2009, 05:43 AM	#5
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,862	Re: 6L80 trans with a NP205? If the 6L80E bolts to a 32 spline NP241 then it can be done with a late-model NP205 with same pattern/spline count.I don`t know what`s in the late trucks,though. __________________ "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 ~



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