1979 K10 drivetrain swap tcase problem... Clocking ring solution? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TheBlueBomber · 07-03-2014, 08:28 PM

So I pulled the 305/th350/np203 and am swapping in a 5.3/4l60e/NP241. After getting the engine bolted down where it needs to be and measuring out the transmission cross member and mocking it up where it needs to be I through the tcase on to see how it would bolt up... I was a little dumbfounded...

At first I thought I mounted it on the wrong hole...

But then after moving it to the next hole up I realized its just not going to line up.

Is that steep angle in the first pictures how these transfer cases sit stock?

http://diy4x.com/cart/index.php?rout...&product_id=64

Looking around I found a clocking ring at DIY4x.com. It has 3 positions. Stock, 15*, and 30*.

Talking to my buddy he says by flattening out these NP241's you can burn up the planetary's.

And he also said this is the cross member I should go with...
http://image.fourwheeler.com/f/92688...rossmember.jpg

So I guess my questions

1. Is the top picture how the NP241 transfer case supposed to mount?
2. If not is this clocking ring something I can use without tearing up the tcase?

Thanks yall

DirtyLarry · 07-03-2014, 10:06 PM

Well, either you can have a front driveshaft built with 4 90 degree bends or do exactly what your buddy said. Go with the correct crossmember that goes with a 208 or 241 and you’ll be all set. No need for needless clock rings or any of that jazz.

TheBlueBomber · 07-03-2014, 11:15 PM

Quote:

Originally Posted by DirtyLarry

Well, either you can have a front driveshaft built with 4 90 degree bends or do exactly what your buddy said. Go with the correct crossmember that goes with a 208 or 241 and you’ll be all set. No need for needless clock rings or any of that jazz.

Thanks a lot this is exactly what I needed. I'll be picking one of those bad boys up soon. The swap is going pretty smooth. Didn't realize how easy it is especially for someone inexperienced like me. Thanks Larry.

JAKA · 07-10-2014, 11:22 PM

Looking at the pictures it looks like the problem is because your bolting your transfer case directly to the later model trans. I think you need to replace the rear housing on the trans with the adapter from advance adapters. Part #50-0405E. This adapter also has the speed sensor and reluctor ring that clamps onto the trans tail shaft. Summit racing sells them. This will replace the rear housing on the new style 4L60E. Then a factory transfer case adapter from behind a 700R4 will bolt to that. Then your 241 should bolt right up in the correct postion. I'm doing this same swap in an 86 K10. Except I'm using a 208 transfer which is pretty much the same.

07-03-2014, 08:28 PM	#1
TheBlueBomber Registered User Join Date: Feb 2013 Location: Cary, NC Posts: 816	1979 K10 drivetrain swap tcase problem... Clocking ring solution? So I pulled the 305/th350/np203 and am swapping in a 5.3/4l60e/NP241. After getting the engine bolted down where it needs to be and measuring out the transmission cross member and mocking it up where it needs to be I through the tcase on to see how it would bolt up... I was a little dumbfounded... At first I thought I mounted it on the wrong hole... But then after moving it to the next hole up I realized its just not going to line up. Is that steep angle in the first pictures how these transfer cases sit stock? http://diy4x.com/cart/index.php?rout...&product_id=64 Looking around I found a clocking ring at DIY4x.com. It has 3 positions. Stock, 15, and 30. Talking to my buddy he says by flattening out these NP241's you can burn up the planetary's. And he also said this is the cross member I should go with... http://image.fourwheeler.com/f/92688...rossmember.jpg So I guess my questions 1. Is the top picture how the NP241 transfer case supposed to mount? 2. If not is this clocking ring something I can use without tearing up the tcase? Thanks yall __________________ Austin 1996 Chevrolet K1500 Silverado 1979 Chevrolet K10 Scottsdale - Carolina K10 - My 4.8L Twin turbo build - Project Short Stroke - Instagram - TheBlueBomber1996

07-03-2014, 10:06 PM	#2
DirtyLarry Windy Corner of a Dirty Street Join Date: Jun 2003 Location: Pueblo West, Colorado Posts: 2,926	Re: 1979 K10 drivetrain swap tcase problem... Clocking ring solution? Well, either you can have a front driveshaft built with 4 90 degree bends or do exactly what your buddy said. Go with the correct crossmember that goes with a 208 or 241 and you’ll be all set. No need for needless clock rings or any of that jazz. __________________ Current vehicle collection: 1978 Chevrolet K10, 8.1L, NV4500, NP205 1989 Chevrolet Suburban, 8.1L, NV4500, NP241 1993 Chevrolet C1500 Sportside, TBI 7.4L, 4L60E 2001 Chevrolet K2500HD, Ext Cab, SWB, 8.1L, ZF 6 speed 2014 Chevrolet Impala LTZ 3.6L Vortec 8.1L because life is too short to tolerate underpowered vehicles Instagram

07-10-2014, 11:22 PM	#4
JAKA Registered User Join Date: Apr 2009 Location: Murray,KY Posts: 39	Re: 1979 K10 drivetrain swap tcase problem... Clocking ring solution? Looking at the pictures it looks like the problem is because your bolting your transfer case directly to the later model trans. I think you need to replace the rear housing on the trans with the adapter from advance adapters. Part #50-0405E. This adapter also has the speed sensor and reluctor ring that clamps onto the trans tail shaft. Summit racing sells them. This will replace the rear housing on the new style 4L60E. Then a factory transfer case adapter from behind a 700R4 will bolt to that. Then your 241 should bolt right up in the correct postion. I'm doing this same swap in an 86 K10. Except I'm using a 208 transfer which is pretty much the same.



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