Ubolts under torqued

No issues here. Won't you have to get longer u-bolts?

 

Even 73 ft-lb is a bit low, considering 1st gens were spec'd for 90 ft-lb.

 

Yes, I have the longer bolts.... That's why I searches about this today and found this thread.. Among a bunch if other threads on this site and others.. Some are saying the do 37ft lbs and its fine...

Is there not a specific spec based on diameter and grade of the bolts?

 

I just put in my rear lift with just a little over 3000mi on my truck. It felt pretty loose. Less than 40lbs.
I wonder if they just feel loose because the U bolts stretched.

 

I look at it this way. Spark plugs are barely tight, and they are at 15. 37 is a little over twice that, which is still not very tight, especially for the axle.

If I were you, I would do at least 80 with spacers.

 

Damn, I checked the ones on the 05 since an AAL was used but not sure I checked the ones on the 08 since nothing has been done back there except swapping the rr shocks for the TRD ones. Maybe I did check and maybe not but seeing this thread is gonna make me check now...........

 

I just talked I toytec as i bought there block and ubolts and did a shitload of research online... The consensus seems to be on a 9/16 ubolt you should be 80-90 ft lbs...

Toyota is f$&ked they don't fix anything 37... Ya 37 and there is no drive line issues with these trucks....

 

Whenever I do installs I always show the owner how loose they are & usually they're shocked .. I've had a couple that weren't much tighter that hand tight..

 

Finally checked mine today. Wow-only 1 on each side clicked at 70 lbs. The others were pretty loose. Torqued all to 70. Thanks for the tip.

 

I also hated the thunk my truck made - and with 36K miles it seemed to get worse so...

Checked mine today, they were looose - probably 37lbs. I torqued them down to 90lbs crossed pattern.

One question:
My leaf springs did not line up perfectly, should they? Is this normal? They were shifted just a bit on both sides - actually the middle leaf was.

Thanks everyone!

 

You can find a little deformity in all leafs but when obliviously out of alignment, chock the front wheels & get a high lift jack or similiar & raise the rear by way of bumper to take most the weight off springs (but don't raise off ground) Get a 2-4lb single jack (sledge hammer) & give'm a smack or 2 to line up, lower truck....done

 

^^^ that is key... I pulled a stupid move and jacked mine up with no chocks and facing down hill.... As soon as the rear came up the truck decided to leave me. Once the rear tires hit the ground it still went ~3 feet....

 

Has anyone searched the manufacturer's specs on the leaf springs ubolts? As far as I know, Toyota doesn't manufacture the leaf springs, correct?

 

is this a spring spec, axle spec, suspension spec ?

I am wondering myself why 37 foot lbs. It is not a simple printing
error as it is stated in lbs/ft, and newtons, and they are both equal to 37footlbs

unless one engineering doc was misprinted, and that was translated
to the manual.

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I have my handydandy torque wrench soaking outdoors as I speak [to come
down to air temperature so I can calibrate it], and will wonk them all down
to 85 and see what I get.

 

Hey Doug finally crawled under my truck yesterday, installed my replacement leaf keepers and checked torque on my ubolts, still tight from the day we installed the leafs.

 

There is a specific spec, I posted it a while back. The spec in the manual is a typo. Torque those fuckers down.

 

Anyone with timbrens have a good way to torque these without removing the timbrens?

 

just checked mine, all of them on my 2012 were below 40lb. not anymore, thanks!!

 

A few possibilities.
1. Typo, number transposed. 37, 73.
2. Typo, hit wrong spot on keyboard. 37, 67.
3. Looked at wrong column in table of design handbook. Suggested assembly torque for M14 or 9/16 is 37 ftlb for aluminum bolts. Suggested torque varies by grade of steel and whether it's coated.

I did mine to 70 ftlb.
Keep in mind that cheap torque wrenches might have low accuracy anyway. I've seen some rated at +\- 25% of range.
Torque is important but "exact" values usually aren't. In the ballpark is good enough because truth is a lot of variables affect the correlation of torque to clamping force.

 

I just did mine; sure as shit, they were 'loose'.
I'm the original owner, 85K, TSB springs installed at 5K
Passenger side; one spun at 35, the others spun at 45.
Driver side; all spun at 50.
I tightened them all to 75.
I definitely 'feel' a difference with the 'goblins'.
Thanks for the heads up; one less goblin to hunt.