Axle to trailing arm u bolt torque? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bigmoe · 01-30-2020, 01:52 PM

1965. Wondering what to torque the u bolts to. I got new ones when I put an aftermarket panhard bar on. I had previously written down 275-300 but my torque wrench doesn't even go that high.

**The Rocknrod** · 01-30-2020, 02:52 PM

http://67-72chevytrucks.com/vboard/s...d.php?t=316066

bigmoe · 01-30-2020, 03:09 PM

Thanks RocknRod. From that link suggestions are all over the board. Suggestions are: 200, 145, 270, 145 or for 11/16" u bolts 175.

**The Rocknrod** · 01-30-2020, 03:41 PM

I can go online and find out, do you know what size the bolts are?
I'm in a meeting pretending this is important.

bigmoe · 01-30-2020, 07:47 PM

Quote:

Originally Posted by the rocknrod

i can go online and find out, do you know what size the bolts are?
I'm in a meeting pretending this is important.

11/16”

**jayoldschool** · 01-30-2020, 08:13 PM

I did "as hard as my shop impact can bang them on" when I replaced my arms.

**The Rocknrod** · 01-31-2020, 08:45 AM

Most torque specs shown for u-bolts go from 5/8” to ¾” u-bolts grade 5 and grade 8 being different specs. That goes for standard hex head screws as well. My search was fruitless concerning 11/16"? - maybe someone else can give you that number, I couldn't find it. I know what I would do, is extrapolate that from the torque charts but that's just me.

SkinnyG · 01-31-2020, 11:40 AM

Why not split the difference and go 250 or so? I usually just rattle them as tight as my impact will go. Decent rule-of-thumb:

joesscamaro · 01-31-2020, 07:45 PM

Metric butt ton

More seriously...I just tightened mine up to German specs.

Katrina/10 · 02-01-2020, 09:21 AM

Gutentite?

ACK · 02-01-2020, 11:14 AM

I think this is the info you're looking for. When I did this, i maxed out the torque wrench to 150 ft lbs, then snugged things up real good using a breaker bar with 6 foot cheater.

vince1 · 02-01-2020, 01:45 PM

I think it would be easy enough to put them so tight that the axle tube would distort.

OTOH I Inherited an old truck that had seen better days and the rear end would wander around inside the U bolts. A steel wedge driven in and tack welded cured that. The next owner had a lot of restoration to do but paying only $250 for a 68 short box I think he did OK.

bigmoe · 02-02-2020, 12:05 AM

Quote:

Originally Posted by ACK

I think this is the info you're looking for. When I did this, i maxed out the torque wrench to 150 ft lbs, then snugged things up real good using a breaker bar with 6 foot cheater.

220-320Ft lbs. is the final answer then.

**The Rocknrod** · 02-02-2020, 10:41 AM

I'd shoot for 210 to 215 - http://www.eatondetroitspring.com/wp...loads/ubts.pdf
But 220 would be good.
Not 320. But as you see everyone has opinions since it isn't in writing. And then . . .

01-30-2020, 01:52 PM	#1
bigmoe Registered User Join Date: Oct 2014 Location: Brandon, Manitoba, Canada Posts: 962	Axle to trailing arm u bolt torque? 1965. Wondering what to torque the u bolts to. I got new ones when I put an aftermarket panhard bar on. I had previously written down 275-300 but my torque wrench doesn't even go that high.

01-30-2020, 02:52 PM	#2
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: Axle to trailing arm u bolt torque? http://67-72chevytrucks.com/vboard/s...d.php?t=316066 __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

01-30-2020, 03:09 PM	#3
bigmoe Registered User Join Date: Oct 2014 Location: Brandon, Manitoba, Canada Posts: 962	Re: Axle to trailing arm u bolt torque? Thanks RocknRod. From that link suggestions are all over the board. Suggestions are: 200, 145, 270, 145 or for 11/16" u bolts 175. Last edited by bigmoe; 01-30-2020 at 03:36 PM. Reason: clarity

01-30-2020, 03:41 PM	#4
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: Axle to trailing arm u bolt torque? I can go online and find out, do you know what size the bolts are? I'm in a meeting pretending this is important. __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

01-30-2020, 08:13 PM	#6
jayoldschool Moderator Join Date: Dec 2012 Location: ON, Canada Posts: 2,155	Re: Axle to trailing arm u bolt torque? I did "as hard as my shop impact can bang them on" when I replaced my arms.

01-31-2020, 08:45 AM	#7
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: Axle to trailing arm u bolt torque? Most torque specs shown for u-bolts go from 5/8” to ¾” u-bolts grade 5 and grade 8 being different specs. That goes for standard hex head screws as well. My search was fruitless concerning 11/16"? - maybe someone else can give you that number, I couldn't find it. I know what I would do, is extrapolate that from the torque charts but that's just me. __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?

01-31-2020, 11:40 AM	#8
SkinnyG Registered User Join Date: Feb 2012 Location: Beautiful BC, Canada, eh?! Posts: 2,209	Re: Axle to trailing arm u bolt torque? Why not split the difference and go 250 or so? I usually just rattle them as tight as my impact will go. Decent rule-of-thumb: __________________ 1961 Apache: "Grabber Orange" Shortboxed, pancake, step-notch, air-ride, boosted-LS 1977 Silverado: Shortboxed & dropped, potato-potato V8 Pontiac Firefly (Chevy Sprint): The ultimate engine swap: 5.7L in a 1.0L bag Lotus Super 7 Replica: Scratch-built street-legal rollerskate

01-31-2020, 07:45 PM	#9
joesscamaro Registered User Join Date: Sep 2008 Location: Newport, North Carolina Posts: 622	Re: Axle to trailing arm u bolt torque? Metric butt ton More seriously...I just tightened mine up to German specs.

02-01-2020, 09:21 AM	#10
Katrina/10 Registered User Join Date: Oct 2010 Location: Ocean Springs, MS Posts: 1,746	Re: Axle to trailing arm u bolt torque? Gutentite? __________________ Gary 1971 Chevrolet C/10 1951 GMC 100 1977 GMC C15 1955 Chevrolet 3100

02-01-2020, 11:14 AM	#11
ACK Registered User Join Date: Oct 2012 Location: Philly, PA Posts: 537	Re: Axle to trailing arm u bolt torque? I think this is the info you're looking for. When I did this, i maxed out the torque wrench to 150 ft lbs, then snugged things up real good using a breaker bar with 6 foot cheater. Attached Images __________________ My truck ain't dead, it just smells funny.

02-01-2020, 01:45 PM	#12
vince1 Registered User Join Date: Jan 2013 Location: Calgary Alberta Posts: 1,166	Re: Axle to trailing arm u bolt torque? I think it would be easy enough to put them so tight that the axle tube would distort. OTOH I Inherited an old truck that had seen better days and the rear end would wander around inside the U bolts. A steel wedge driven in and tack welded cured that. The next owner had a lot of restoration to do but paying only $250 for a 68 short box I think he did OK.

02-02-2020, 10:41 AM	#14
The Rocknrod Moderator Join Date: Aug 2011 Location: China Spring, TX Posts: 7,280	Re: Axle to trailing arm u bolt torque? I'd shoot for 210 to 215 - http://www.eatondetroitspring.com/wp...loads/ubts.pdf But 220 would be good. Not 320. But as you see everyone has opinions since it isn't in writing. And then . . . __________________ Master Chief, US Navy, Retired 1964 C10 Step-side Short Bed - In Progress 2009 2500HD Duramax LTZ 1948 GMC Panel 1956 Big Window Stepside 1953 5 Window Chevy Stepside 1932 Coupe New Seat Foam for Bench Seats?



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