4l60e to np241 4 Lo question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

79bonanza · 11-25-2013, 04:01 AM

Ok guys I'm swapping a 99 5.3 4L60e In to my 91 k5. I'm going to run my same np241 transfer case. I was just wondering if my trans and engine are gonna freak out when I put the transfer case in low range and it changes the vehicle speed but won't change the gear or rpm. Won't my trans think it's slipping.

I know new transfer cases have a speed sensor on the front drive shaft as well and a sensor letting it know it's in 4 lo

So what do you guys think

Bigdav160 · 11-25-2013, 11:17 AM

The ECM needs input from the transfer case so to know when you've engaged 4WD-LO

79bonanza · 11-25-2013, 03:34 PM

Ahh ok, do you know if it's just a simple ground switch or is it like a speed sensor. If it's just a ground switch couldn't I just run it to like a brake witch setup on my shifter housing.

Angryman117 · 11-27-2013, 11:45 AM

Check out LT1SWAP, they have the PCM pinouts listed that you will need to use.

11-25-2013, 04:01 AM	#1
79bonanza Registered User Join Date: Oct 2010 Location: sadieville, kentucky Posts: 167	4l60e to np241 4 Lo question Ok guys I'm swapping a 99 5.3 4L60e In to my 91 k5. I'm going to run my same np241 transfer case. I was just wondering if my trans and engine are gonna freak out when I put the transfer case in low range and it changes the vehicle speed but won't change the gear or rpm. Won't my trans think it's slipping. I know new transfer cases have a speed sensor on the front drive shaft as well and a sensor letting it know it's in 4 lo So what do you guys think

11-25-2013, 11:17 AM	#2
Bigdav160 Registered User Join Date: Apr 2011 Location: Klein Texas Posts: 3,852	Re: 4l60e to np241 4 Lo question The ECM needs input from the transfer case so to know when you've engaged 4WD-LO __________________ My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe

11-25-2013, 03:34 PM	#3
79bonanza Registered User Join Date: Oct 2010 Location: sadieville, kentucky Posts: 167	Re: 4l60e to np241 4 Lo question Ahh ok, do you know if it's just a simple ground switch or is it like a speed sensor. If it's just a ground switch couldn't I just run it to like a brake witch setup on my shifter housing.

11-27-2013, 11:45 AM	#4
Angryman117 Registered User Join Date: Jul 2013 Location: VAFB, CA Posts: 227	Re: 4l60e to np241 4 Lo question Check out LT1SWAP, they have the PCM pinouts listed that you will need to use. __________________ Angryman117's 47 Chevy Build 89 Silverado Z71 LS Swap (sold)

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