3/4 ton leaf u-bolt torque - The 1947 - Present Chevrolet & GMC Truck Message Board Network

greenhorn male · 02-28-2005, 02:38 PM

What do you guys torque the rear leaf spring u-bolts to. It's a 10 bolt full floater (dana 60 i beleive). Thanks!

**tnblazerk5** · 02-28-2005, 03:08 PM

i have never really torqued them i just use a inpact and get them as tight as it will get them and then in a week or so do it again and most of the time they are still tight !!! so i really cant answer your ???? sorry

greenhorn male · 02-28-2005, 03:34 PM

I was told if you overtighten them you can damage the axel

**tnblazerk5** · 02-28-2005, 04:20 PM

that may be true but the inpact i got wont do that (i dont think it will anyway and it hasnt yet that i know of )

ok i got to thinking about that the ubolt is a lesser grade steel than the axel housing and it will brake before it will hurt the axel i think ?

sumbody correct me if i am wrong on that

**JIMs70GMC** · 02-28-2005, 08:04 PM

per my haynes: 140 ft-lbs Should be a 9/16 fine thread.

Robert1970C20rstbukt · 02-28-2005, 08:31 PM

In my '70 Chevrolet service manual it says C20 with a 3/4" U bolt, to torque 'em down at 175-250 ft. lbs.

02-28-2005, 02:38 PM	#1
greenhorn male Senior Member Join Date: Jan 2003 Location: Bay Area, Northern California Posts: 1,344	3/4 ton leaf u-bolt torque What do you guys torque the rear leaf spring u-bolts to. It's a 10 bolt full floater (dana 60 i beleive). Thanks! __________________ 03 Tahoe 72 GMC Super Custom 2500 Custom Camper, my reliable workhorse. Dual gauged tanks, dual battery trays.

02-28-2005, 03:34 PM	#3
greenhorn male Senior Member Join Date: Jan 2003 Location: Bay Area, Northern California Posts: 1,344	I was told if you overtighten them you can damage the axel __________________ 03 Tahoe 72 GMC Super Custom 2500 Custom Camper, my reliable workhorse. Dual gauged tanks, dual battery trays.

02-28-2005, 04:20 PM	#4
tnblazerk5 User #12137 Join Date: Apr 2004 Location: kingsport,upper east tenn Posts: 11,598	that may be true but the inpact i got wont do that (i dont think it will anyway and it hasnt yet that i know of ) ok i got to thinking about that the ubolt is a lesser grade steel than the axel housing and it will brake before it will hurt the axel i think ? sumbody correct me if i am wrong on that Last edited by tnblazerk5; 02-28-2005 at 04:24 PM.

02-28-2005, 08:04 PM	#5
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	per my haynes: 140 ft-lbs Should be a 9/16 fine thread. __________________ 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

02-28-2005, 08:31 PM	#6
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	In my '70 Chevrolet service manual it says C20 with a 3/4" U bolt, to torque 'em down at 175-250 ft. lbs. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

02-28-2005, 03:08 PM	#2
tnblazerk5 User #12137 Join Date: Apr 2004 Location: kingsport,upper east tenn Posts: 11,598	i have never really torqued them i just use a inpact and get them as tight as it will get them and then in a week or so do it again and most of the time they are still tight !!! so i really cant answer your ???? sorry



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