Rear stiffening bar bolt torque? - Chevy SSR Forum
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  • 1 Post By xoxoxoBruce
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post #1 of 20 (permalink) Old 03-29-2019, 10:44 AM Thread Starter
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Rear stiffening bar bolt torque?

Hello all. I am installing the Simple-engineering rear 4 bolt bar and cannot find any info on the correct torque for the bolts. Anyone know?
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post #2 of 20 (permalink) Old 03-29-2019, 11:54 AM
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37 foot pounds.
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post #3 of 20 (permalink) Old 03-29-2019, 02:25 PM Thread Starter
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Thank you
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post #4 of 20 (permalink) Old 03-29-2019, 02:47 PM
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Ron, You would be ahead if you FIRST, used a clean out Tap on the 2 holes that have not been used. Maybe someone, @xoxoxoBruce , will post the size and I'm away right now.

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post #5 of 20 (permalink) Old 03-29-2019, 03:43 PM
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I have a YouTube video for the installation of this item and it covers cleaning out the threads and the bolt torque value.



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post #6 of 20 (permalink) Old 03-30-2019, 07:07 AM
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I followed Retrocarguy350 you tube video. He makes some great videos very educational. Made it easy. Life is Good.
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post #7 of 20 (permalink) Old 03-30-2019, 08:36 AM
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Look up CROSSMEMBER

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post #8 of 20 (permalink) Old 03-30-2019, 09:30 AM
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Ron,

Installed the 4 bolt plate and steel radiator support from SE several months ago. It made a difference in the overall ride with potholes and railroad tracks. Normal hazards in today's roadways. However, used Dicktator's specs of 40 foot pounds rather than the 37 foot pounds for the stock Trailblazer bar. I'm sure either will work, but Dicktator's recommendations are the "gold standard".

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post #9 of 20 (permalink) Old 03-30-2019, 09:55 AM
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Ron,

Installed the 4 bolt plate and steel radiator support from SE several months ago. It made a difference in the overall ride with potholes and railroad tracks. Normal hazards in today's roadways. However, used Dicktator's specs of 40 foot pounds rather than the 37 foot pounds for the stock Trailblazer bar. I'm sure either will work, but Dicktator's recommendations are the "gold standard".

Boomer Bob
To be clear about this.......

The GM Service manual for the SSR has the torque spec for the crossmember bolts listed at 37 ft-lbs.

Maximum torque for the M10-1.5, grade 10.9 bolts that I send with the 4-bolt crossmember is 60 ft-lbs.

This tells me that the threaded inserts in the frame, not the bolts, are the limiting factor. Knowing that GM has some safety margin on the frame inserts, I must assume that they will put up with a lot more that 37 ft-lb. My recommendation is to torque the bolts to some value between 37 and 40 ft-lb. This will not overstress the insets. The secret is to be sure that the threads are not gummed up with crap from 15 years of exposure.

Regards,

Mike
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post #10 of 20 (permalink) Old 03-30-2019, 04:45 PM
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Ron, You would be ahead if you FIRST, used a clean out Tap on the 2 holes that have not been used. Maybe someone, @xoxoxoBruce , will post the size and I'm away right now.

Nick
I gave him a link to the thread that explains all that and gives the thread size.
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post #11 of 20 (permalink) Old 03-30-2019, 05:06 PM
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Quote:
Originally Posted by xoxoxoBruce View Post
I gave him a link to the thread that explains all that and gives the thread size.


I can't let this go without a comment. For sure, I support cleaning out the threaded part in this case to get a clean set for tightening the bracket.

And I understand Mikes comment about the (thread insert) and possibly over doing it.

but comeone...................I gotta believe most all without this posted question would NOT ahve given a second thought to (how much torque mounting a bracket to a frame rail) would need or take.
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post #12 of 20 (permalink) Old 03-30-2019, 07:02 PM
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Our “RGang “ group have installed our share of these and we us 40lbs or torque.
Never had any issues. And yes we have had the clean out a few of the frame threads due to gunk build up over the years.
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post #13 of 20 (permalink) Old 03-30-2019, 07:33 PM
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Moscooter You are not alone. I installed both of mine and did not even give the slightest thought of getting out the torque wrench to install them.
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post #14 of 20 (permalink) Old 03-31-2019, 09:13 AM
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Moscooter You are not alone. I installed both of mine and did not even give the slightest thought of getting out the torque wrench to install them.
You know, for those of us that have "wrenched" all our lives, this is an easy install without a t. wrench. Conversely, for someone that doesn't "wrench" the t. wrench is a very good idea, as they have never developed the "feel"!

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post #15 of 20 (permalink) Old 03-31-2019, 09:22 AM
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You know, for those of us that have "wrenched" all our lives, this is an easy install without a t. wrench. Conversely, for someone that doesn't "wrench" the t. wrench is a very good idea, as they have never developed the "feel"!
Yeah....... You are so right. I have several torque reference points...... based on “the feel”.......

1/4” normal length ratchet maxes out at about 12 ft-lbs
3/8” standard length ratchet maxes out at about 32 ft-lbs
1/2” standard length ratchet maxes out at about 45 ft-lbs

I also joke that I have a “wrist click” at 50 ft-lbs on a 1/2” ratchet.

Have a great day,

Mike

PS..... Since I have turned 70, I am betting that I need to get my “feel” recalibrated..... getting old sux.

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post #16 of 20 (permalink) Old 03-31-2019, 09:34 AM
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Quote:
Originally Posted by Mike in AZ View Post
Yeah....... You are so right. I have several torque reference points...... based on “the feel”.......

1/4” normal length ratchet maxes out at about 12 ft-lbs
3/8” standard length ratchet maxes out at about 32 ft-lbs
1/2” standard length ratchet maxes out at about 45 ft-lbs

I also joke that I have a “wrist click” at 50 ft-lbs on a 1/2” ratchet.

Have a great day,

Mike

PS..... Since I have turned 70, I am betting that I need to get my “feel” recalibrated..... getting old sux.

Wow my friend, your PS took the exact words right out of my mouth! I'm hitting 70 in a month and the recent additions to my old tool set are an 18" long 3/8 drive ratchet and a 24" long 1/2 drive torque wrench. For me it's a "shoulder click" @ 70#, when torqueing head bolts! Getting old sucks, but I ain't giving up the wrenching - too much fun!

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post #17 of 20 (permalink) Old 03-31-2019, 09:46 AM
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Topspin and Mike you both said it perfectly.
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post #18 of 20 (permalink) Old 03-31-2019, 01:08 PM
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Since Ron got a lot of answers and y'all mentioned this---

Quote:
Originally Posted by Mike in AZ View Post
Mike

PS..... Since I have turned 70, I am betting that I need to get my “feel” recalibrated..... getting old sux.
Quote:
Originally Posted by Topspin View Post
Wow my friend, your PS took the exact words right out of my mouth! I'm hitting 70 in a month
My wake up call was at 73, 3 years ago, taking the Cast iron Big Block 402 Heads off and on the '66 Chevelle!!!

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post #19 of 20 (permalink) Old 03-31-2019, 05:39 PM
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I can't let this go without a comment. For sure, I support cleaning out the threaded part in this case to get a clean set for tightening the bracket.

And I understand Mikes comment about the (thread insert) and possibly over doing it.

but comeone...................I gotta believe most all without this posted question would NOT ahve given a second thought to (how much torque mounting a bracket to a frame rail) would need or take.
We both know GM specifies a proper torque for every fastener on every vehicle they build. When I installed mine I didn't torque it, I tightened it. But evidently Ron S is not comfortable with that so asked for the proper torque. There is nothing wrong with doing it the right way, instead of the good enough way.
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post #20 of 20 (permalink) Old 03-31-2019, 07:52 PM
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Since Ron got a lot of answers and y'all mentioned this---





My wake was at 73, 3 years ago, taking the Cast iron Big Block 402 Heads off and on the '66 Chevelle!!!

Nick
You all are really cool!
Reminds me of a car cruise I once went to.... I heard a big block start up on the other side of the parking lot. It was barking and loping. I began walking that way to check it out and discovered an 80 year old college professor with grey hair down the middle of his back and a beard half way down his belly crawling over the roll cage to get in the car. He eventually jumped on it, standing it on the wheelie bars! I didn’t see it, but he had to be grinning ear to ear! I know I was .....l It was an old ford coupe...
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