NP208 vs. Np241 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**rs74** · 10-19-2013, 10:32 PM

Has anyone ever put a 241 transfer case in place of a 208 in their square. From what I hear it is just an updated version of the 208 with better oiling system and shifting. Not sure if you can just take a 241 that was auto trans and put it on any auto trans or not. Do driveshafts have to be modified?

83GMCK2500 · 10-19-2013, 11:00 PM

The 241 has an upgraded planetary as well. I think 6-pinion, if I remember correct. With that and the oiling upgrades it is rated for a higher GVWR. The square body 241 has a couple variations, early ones have the cable driven speedo, '91MY have VSS for electric speedo. There are two different input shafts as well, 27 spline and 32 spline. I know the 32 spline is on models behind a 4L80-E and 27 spline after 4L60s (or the updated 700R4 if you prefer). As far as spline count, I do not know what is behind SM-465s, TH350, or TH400, if those trans were available when the NP241 was.

**rs74** · 10-19-2013, 11:06 PM

Just wondering because I have a 241 out of my 91 Z71 that came with a 700r4. I will have to check into the spline count between the two. I will have to see if it can go on a 350TH trans.

joe231 · 10-19-2013, 11:36 PM

Your z71 t-case is drivers drop
Squares are passenger drop

83GMCK2500 · 10-19-2013, 11:43 PM

I stated square body 241 for a reason, as joe mentioned, the 241 was used heavily in the IFS trucks and it is a driver's side drop case.

andrewmp6 · 10-20-2013, 02:28 AM

And the np241 has slightly lower gearing then the np208 and the np241 is easier to do a SYE on then the np208 is.

Unca · 10-20-2013, 07:02 AM

A 241 is a bit heavier duty then a np231 (jeep wrangler case.) it has been used a lot in 1/2 ton trucks. it can take a beating but wont hold as much as the older gear drives or a dana 300. some cases can be flopped and run upside down solving some of your drop issues. but more research and info would be needed to make that decision. jeepers for years have used and trusted advanced adaptors ( mating things is easier when they help out....)
http://www.advanceadapters.com/categ.../0/0/12/0/0/0/

andrewmp6 · 10-20-2013, 08:15 AM

GM trans are odd i don't think it will bolt right on a 350th,Do you still have the 700r4?If its still in good shape i would swap them both.

**rs74** · 10-20-2013, 09:01 AM

Yes I should have known about the drop being on the wrong side. It must have been a dodge 241 I read about the swap.

andrewmp6 · 10-21-2013, 04:03 AM

Is your np208 in good shape?If its just a normal truck the np208 should be fine in it.If your looking at having a off road toy i would think hard about a np205 swap then.

**rs74** · 10-21-2013, 08:50 AM

Quote:

Originally Posted by andrewmp6

Is your np208 in good shape?If its just a normal truck the np208 should be fine in it.If your looking at having a off road toy i would think hard about a np205 swap then.

A guy I know is building a truck to do flat drags. He said they use the 208 since it has lower gears. I knew I had a 241 and had read where some guys were putting 241's in their K5's and trucks for the lower gear and also the internal oil pump. The 208 has something like a 2.6 gear and the 241 is around a 2.7.

mrolds88 · 10-21-2013, 10:20 AM

I believe they used the 241 earlier than 91 with the electronic speedo. I have a 90 unit out in the garage. Was going to use it in a project but it left. I will try to dig it out and get some specs on it.

*nekkidhillbilly* · 10-21-2013, 01:40 PM

you can swap in a ford or dodge lh drop axle and use a lh drop transfer case

10-19-2013, 10:32 PM	#1
rs74 Senior Member Join Date: Jun 2010 Location: Illinois Posts: 2,957	NP208 vs. Np241 Has anyone ever put a 241 transfer case in place of a 208 in their square. From what I hear it is just an updated version of the 208 with better oiling system and shifting. Not sure if you can just take a 241 that was auto trans and put it on any auto trans or not. Do driveshafts have to be modified? __________________ Roy 85 Short Bed Silverado- Work in progress. http://67-72chevytrucks.com/vboard/s...d.php?t=564818 1987 R10 shortie

10-19-2013, 11:00 PM	#2
83GMCK2500 Registered User Join Date: Sep 2009 Location: Beaverton, OR from WA State Posts: 1,515	Re: NP208 vs. Np241 The 241 has an upgraded planetary as well. I think 6-pinion, if I remember correct. With that and the oiling upgrades it is rated for a higher GVWR. The square body 241 has a couple variations, early ones have the cable driven speedo, '91MY have VSS for electric speedo. There are two different input shafts as well, 27 spline and 32 spline. I know the 32 spline is on models behind a 4L80-E and 27 spline after 4L60s (or the updated 700R4 if you prefer). As far as spline count, I do not know what is behind SM-465s, TH350, or TH400, if those trans were available when the NP241 was. __________________ Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96 Last edited by 83GMCK2500; 10-19-2013 at 11:39 PM.

10-19-2013, 11:06 PM	#3
rs74 Senior Member Join Date: Jun 2010 Location: Illinois Posts: 2,957	Re: NP208 vs. Np241 Just wondering because I have a 241 out of my 91 Z71 that came with a 700r4. I will have to check into the spline count between the two. I will have to see if it can go on a 350TH trans. __________________ Roy 85 Short Bed Silverado- Work in progress. http://67-72chevytrucks.com/vboard/s...d.php?t=564818 1987 R10 shortie

10-19-2013, 11:36 PM	#4
joe231 Registered User Join Date: Dec 2007 Location: Palmer, Alaska Posts: 13,821	Re: NP208 vs. Np241 Your z71 t-case is drivers drop Squares are passenger drop __________________ *CHEVY ONLY*

10-19-2013, 11:43 PM	#5
83GMCK2500 Registered User Join Date: Sep 2009 Location: Beaverton, OR from WA State Posts: 1,515	Re: NP208 vs. Np241 I stated square body 241 for a reason, as joe mentioned, the 241 was used heavily in the IFS trucks and it is a driver's side drop case. __________________ Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96

10-20-2013, 02:28 AM	#6
andrewmp6 Registered User Join Date: Jan 2009 Location: Louisville,Ky Posts: 5,811	Re: NP208 vs. Np241 And the np241 has slightly lower gearing then the np208 and the np241 is easier to do a SYE on then the np208 is.

10-20-2013, 07:02 AM	#7
Unca Registered User Join Date: Apr 2013 Location: Laporte, IN Posts: 57	Re: NP208 vs. Np241 A 241 is a bit heavier duty then a np231 (jeep wrangler case.) it has been used a lot in 1/2 ton trucks. it can take a beating but wont hold as much as the older gear drives or a dana 300. some cases can be flopped and run upside down solving some of your drop issues. but more research and info would be needed to make that decision. jeepers for years have used and trusted advanced adaptors ( mating things is easier when they help out....) http://www.advanceadapters.com/categ.../0/0/12/0/0/0/

10-20-2013, 08:15 AM	#8
andrewmp6 Registered User Join Date: Jan 2009 Location: Louisville,Ky Posts: 5,811	Re: NP208 vs. Np241 GM trans are odd i don't think it will bolt right on a 350th,Do you still have the 700r4?If its still in good shape i would swap them both.

10-20-2013, 09:01 AM	#9
rs74 Senior Member Join Date: Jun 2010 Location: Illinois Posts: 2,957	Re: NP208 vs. Np241 Yes I should have known about the drop being on the wrong side. It must have been a dodge 241 I read about the swap. __________________ Roy 85 Short Bed Silverado- Work in progress. http://67-72chevytrucks.com/vboard/s...d.php?t=564818 1987 R10 shortie

10-21-2013, 04:03 AM	#10
andrewmp6 Registered User Join Date: Jan 2009 Location: Louisville,Ky Posts: 5,811	Re: NP208 vs. Np241 Is your np208 in good shape?If its just a normal truck the np208 should be fine in it.If your looking at having a off road toy i would think hard about a np205 swap then.

10-21-2013, 10:20 AM	#12
mrolds88 Registered User Join Date: Jul 2011 Location: WV Posts: 946	Re: NP208 vs. Np241 I believe they used the 241 earlier than 91 with the electronic speedo. I have a 90 unit out in the garage. Was going to use it in a project but it left. I will try to dig it out and get some specs on it. __________________ 72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold 70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD

10-21-2013, 01:40 PM	#13
nekkidhillbilly Account Suspended Join Date: Apr 2009 Location: hazard, ky Posts: 1,674	Re: NP208 vs. Np241 you can swap in a ford or dodge lh drop axle and use a lh drop transfer case

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