anyone know what size the bolts are that bolt the tranny to the block?

 

10mm by 1.5 pitch, 40mm long

 

thank u sir

 

use factory bolts or youll be in a pickle.
most hardware grade bolts have a large 17mm head thats a paint to get in and out in a tight spot.
stockers are 15mm heads.

 

Any chance you know what the factory GM bolt part number is?

 

Part number 14050422.

FWIW I have ordered these 2 different times and they come with a 15mm hex head. Not sure about a M6, but I know an A4 comes with 13mm hex head. I still used them though. HTH

 

smaller the head the better, IMO

 

I needed the bellhousing bolts for my M6 and this is the part number the Gm place got me
12523235

does anyone know the difference btw these and the part # above?

I bought these bolts from Gmpartsdiect and not only did they cost alot but they had to be special ordered.....I still have not gotten them. If found the same bolt size with the right head size and of a higher strength then 8.8 at the hardware store for next to nothin.....

 

I googled your part number, and it appears 12523235 are for fastening the transmission to bellhousing ... The ones listed above are for fastening the bellhousing to the block.

EDIT: I noticed that your p/n is also a M10x1.5x40mm bolt ... my guess is you could use either p/n for the bellhousing to block. Maybe 12523235 has the smaller 13mm hex head?

 

The guy I called at the dealership told me they were the same size bolts.....bellhousing to block and trans to bellhousing........a total of 11 bolts........he better have been right or I am going to throw a tantrum

 

they interchange. I dunno if they're identical, but I know some got mixed up in my drivetrain. No problem.

 

yeah they'll all work interchangeably. fwiw the bolts that hold the bellhousing to the block are grade 10.9 on my 5.3L and the other tranny bolts are all 9.8. I dont think it matters much though.

 

automatic has a total of 5 bellhousing bolts.

 

So this number (12523235) is correct for the five bolts that are used on the automatic bell housing?

GM parts direct says it's in the "engine clutch housing catagory). I needed five of these to bolt my 4l60e tranny to the 5.3 block.

Thanks!

 

Auto has 6 Bolts that bolt into the Block.. 2 on each side..one in the middle, one in the spot here on my T56 Bell Housing that doesn't have it..