Ok so my mechanic was taking a look at my car to solve an issue it was having and as he was looking for an answer to one prob he ended seeing another major problem. My sub frame bolt is missing! Im trying to find out what size mm is the bolt and threading also so I can buy it asap and have it put on! And need to know where I can find that bolt that way I dont have to order it online and wait for it to get here I wana have it as soon as I pay for it. Please hmu with some answers asap need this issue fixed kuz its my daily driver and only way of transportation so im driving around like -_-

Which bolt is it? There are 3 different ones holding the sub frame on. Quickest might be to putt the one from the same location on the other side and measure it and then put it back in.

Idk which one is it my mechanic just told me im missing a bolt on the passenger side he dont know if there's others missing that was just the only one he saw

Having just removed my subframe, I can tell you a little about the bolts involved. There are 6 total, 3 on one side, 3 on the other. They are a mirror copy. Of those 6, 4 are the same, in length and thread. Then there are two that have a large metal/rubber/plastic piece, not sure of the material, but it's got some kind of large spacer/weight distribution piece. That piece is on the higher part of the subframe. The other 4 are on the bottom/rear (rear of car) part of the subframe. They are about 3 inches or more in length, and have a 15mm hex head to them. You should be able to get new ones from GM.

VTLoki wrote:Having just removed my subframe, I can tell you a little about the bolts involved. There are 6 total, 3 on one side, 3 on the other. They are a mirror copy. Of those 6, 4 are the same, in length and thread. Then there are two that have a large metal/rubber/plastic piece, not sure of the material, but it's got some kind of large spacer/weight distribution piece. That piece is on the higher part of the subframe. The other 4 are on the bottom/rear (rear of car) part of the subframe. They are about 3 inches or more in length, and have a 15mm hex head to them. You should be able to get new ones from GM.

Ight cool and the one we saw missing is the one with the washer kuz on the sub frame it looked like a washer goes there. Do you knowhow how will it cost me at the gm to get me them bolts? Kuz I know buying things at the dealers can be very pricey lol

Well, it's only a bolt, so i don't think it can be too much. Also, none of the bolts had a washer. The one I was describing wasn't really a washer as it was a bump stop thing. It was 1" in length, and it was the outer most bolt, closest to the brake rotor. The other ones on the bottom of the car are just a single bolt, that have the washer kind of built in.
Here's a reference picture.