Eaton to 14 Bolt Swap????? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

HeavyK20 · 05-16-2005, 11:33 PM

I'm want to change from an Eaton to a 14 Bolt rear. I am wondering if my driveshaft length will have to be adjusted. Does anyone know if the pinion yoke position is the same between these two units?

**JIMs70GMC** · 05-17-2005, 06:09 AM

I have no exact measurements but I believe the pinion is lower and the yoke sticks out further than the eaton. I know the dana 60 pinion in my gmc sticks out further than the eaton pinion in my chevy.

HeavyK20 · 05-17-2005, 08:18 AM

Thanks for the input. I have a 60 core and it looks like the driveshaft would have to be shortened going from Eaton to a 60. I was hoping that the 14 bolt would be close enough to the Eaton that I would not have to jack with the driveshaft.

ryanroo · 05-17-2005, 05:21 PM

if i remember correctly when i did the swap, it shortened the driveshaft, i just ahd a machine shop cut the weld off and cut he tube then reweld the yoke on. spent like 15 bucks. i know for a fact that the 14 bolt pinion is alot farther away from the rear output that a dana 60 rear, i just did that swap like a month ago. my driveshaft still worked, but i had installed a longer tranny/tcase so yours might not.
Ryan

05-16-2005, 11:33 PM	#1
HeavyK20 Registered User Join Date: Dec 2001 Location: New Richmond, WI Posts: 547	Eaton to 14 Bolt Swap????? I'm want to change from an Eaton to a 14 Bolt rear. I am wondering if my driveshaft length will have to be adjusted. Does anyone know if the pinion yoke position is the same between these two units? __________________ Eric 1969 K20, 465/205 package

05-17-2005, 06:09 AM	#2
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I have no exact measurements but I believe the pinion is lower and the yoke sticks out further than the eaton. I know the dana 60 pinion in my gmc sticks out further than the eaton pinion in my chevy. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

05-17-2005, 08:18 AM	#3
HeavyK20 Registered User Join Date: Dec 2001 Location: New Richmond, WI Posts: 547	Thanks for the input. I have a 60 core and it looks like the driveshaft would have to be shortened going from Eaton to a 60. I was hoping that the 14 bolt would be close enough to the Eaton that I would not have to jack with the driveshaft. __________________ Eric 1969 K20, 465/205 package

05-17-2005, 05:21 PM	#4
ryanroo Senior Member Join Date: Apr 2004 Location: sw colorado Posts: 2,720	if i remember correctly when i did the swap, it shortened the driveshaft, i just ahd a machine shop cut the weld off and cut he tube then reweld the yoke on. spent like 15 bucks. i know for a fact that the 14 bolt pinion is alot farther away from the rear output that a dana 60 rear, i just did that swap like a month ago. my driveshaft still worked, but i had installed a longer tranny/tcase so yours might not. Ryan __________________ 72 K20 12v build 72 K20 "parts truck" A place for your diesel swap questions

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