NP241 RH/LH Differences? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**special-K** · 01-22-2008, 08:18 PM

How interchangeable are NP241C cases?Can I take an NV4500/NP241 LH-drop and just bolt an NP241 RH-drop in it`s place?How about any differences in an NP241 from behind a 4L80E and one from behind an NV 4500?

bigtruck81 · 01-28-2008, 05:16 AM

both should be 32 spline, prividing you have the proper adapters for the 4500, this shouldnt be a problem.

*FormerMember* · 01-28-2008, 06:13 AM

Where is the NV4500 from?

1 ton Chevy should be 32 spline output

Dodge output is 23 or 29, I think...both should be the round 6 bolt pattern. I have several 241's here, as well as a 271 from behind a Chevy NV4500.

I think the GM NV4500 and 4L80E use different length output shafts, but it shouldn't be too hard to make a spacer if required.

**special-K** · 02-17-2008, 09:43 PM

Here`s some better info.Thanks so far.

Truck#1:
`92 GMC K3500 SRW 6.5TD NV4500(solid flywheel) NP241 4.10

Truck#2:
`91 Chevy K(R/V?)2500 Suburban 6.2 4L80E NP241 4.10

boostat4500 · 02-17-2008, 11:55 PM

I know the newer 4l80e trannys are clocked as far as how the t-case bolts up. Meaning it can only go on in one spot, the studs are not symetrical all around. If the older one's, like yours, are the same way, I don't think you could swap between a left and right hand drop without the front output being in a really weird spot. Hope this helps some.

01-28-2008, 06:13 AM	#3
FormerMember Account Suspended Join Date: Feb 2004 Posts: 3,051	Re: NP241 RH/LH Differences? Where is the NV4500 from? 1 ton Chevy should be 32 spline output Dodge output is 23 or 29, I think...both should be the round 6 bolt pattern. I have several 241's here, as well as a 271 from behind a Chevy NV4500. I think the GM NV4500 and 4L80E use different length output shafts, but it shouldn't be too hard to make a spacer if required. Last edited by FormerMember; 01-28-2008 at 06:14 AM.

02-17-2008, 09:43 PM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,863	Re: NP241 RH/LH Differences? Here`s some better info.Thanks so far. Truck#1: `92 GMC K3500 SRW 6.5TD NV4500(solid flywheel) NP241 4.10 Truck#2: `91 Chevy K(R/V?)2500 Suburban 6.2 4L80E NP241 4.10 __________________ "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 ~

02-17-2008, 11:55 PM	#5
boostat4500 Registered User Join Date: Aug 2006 Location: Reno, NV Posts: 346	Re: NP241 RH/LH Differences? I know the newer 4l80e trannys are clocked as far as how the t-case bolts up. Meaning it can only go on in one spot, the studs are not symetrical all around. If the older one's, like yours, are the same way, I don't think you could swap between a left and right hand drop without the front output being in a really weird spot. Hope this helps some. __________________ 1971 Suburban 4x4, LQ4 6.0L, 4L80E, etc. Last edited by boostat4500; 02-17-2008 at 11:55 PM.

01-22-2008, 08:18 PM	#1
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,863	NP241 RH/LH Differences? How interchangeable are NP241C cases?Can I take an NV4500/NP241 LH-drop and just bolt an NP241 RH-drop in it`s place?How about any differences in an NP241 from behind a 4L80E and one from behind an NV 4500? __________________ "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 ~

01-28-2008, 05:16 AM	#2
bigtruck81 Registered User Join Date: Feb 2004 Location: northern, in Posts: 350	Re: NP241 RH/LH Differences? both should be 32 spline, prividing you have the proper adapters for the 4500, this shouldnt be a problem.



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