Subframe bolts torque specs? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-12-2008, 01:42 PM   #1
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Default Subframe bolts torque specs?

I've searched and can't find.

Anyone know the torque specs for subframe bolts? (For the '98, if it'* different year-to-year)
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Old 03-12-2008, 03:03 PM   #2
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Default specs

It'* in my service manual, at least for my '93.. I know this because I looked it up when I reinstalled mine. I can have an anwer for you tonight, once I get home. I can tell you now that it isn't all that much.. So don't go twisting on them with a big ol' pipe on your breaker bar... They tend to come out a LOT harder than they go back in, of course..
I'm thinking like 70 ft-lbs., but don't hold me to that..

Mike
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Old 03-12-2008, 03:38 PM   #3
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I don't have time to check, but I assume you checked Techinfo? I don't remember if I put those in there or not.
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Old 03-12-2008, 04:05 PM   #4
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Quote:
Originally Posted by willwren
I don't have time to check, but I assume you checked Techinfo? I don't remember if I put those in there or not.
I didn't find it in Techinfo.
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Old 03-12-2008, 04:24 PM   #5
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I'll check my '97 FSM, tonight, as well and if I find it, I'll post it so we can see if there are any differences between the years.
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Old 03-12-2008, 04:54 PM   #6
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87-99 will be the same for all H bodies.
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Old 03-12-2008, 09:48 PM   #7
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I assume these are the bolts that go through the insulators? If so, the FSM indicates the spec is 66 lb. ft. Interesting is that it also identifies a "sequence" for tightening, if the entire subframe is dropped:

a. Left hand poistion 2
b. Right hand position 2
c. Left hand position 1
d. Left hand position 3
e. Remaining bolts (sequence optional)

Yet, there is no diagram to show the positions, only a color of insulator and part number assigned to a position

If you are referring to the bolts that hold the two subframe pieces together, then the spec is 43 lb. ft.
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Old 03-13-2008, 12:48 AM   #8
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Quote:
Originally Posted by Echo SSEI
Yet, there is no diagram to show the positions, only a color of insulator and part number assigned to a position
Position 1 refers to the two front ones and “Position 3” refers to the two rear ones - IIRC.
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Old 03-13-2008, 01:20 PM   #9
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Thanks for the info guys.

When I get under it to take a look this weekend, I may have more questions as to which position is No 1 , 2 and 3
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Old 03-13-2008, 03:40 PM   #10
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I am going to do some more investigation on this postion stuff to see if I can determine what is going on. The FSM for '97 is quite difficult to decipher for some things, since it was a year that they changed the layout of teh FSMs. Travis (sonoma_zr2) also has some information that might be helpful that he posted in the "General" section.
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