Does anyone know the size or even p/n of the bolts that hold the front prop shaft CV joint to the transfer case? They are 10mm hex head, but a small head compared to the bolt, and also has a flange.
I've replaced the CV joints a number of times, and now the transfer case, and they are getting a little rounded off.

I've been trying to search but have not come up with anything at the moment.

 

 

Thanks Hummerz! Unfortunately, these appear to be a unique (or more unique) bolt than what I can find cheap. Dealer quoted about $9 per bolt, and it appears that is what I will end up paying. I did find cheaper online, but shipping was horrible.

I recommend a 6-sided socket when working with these (expensive) bolts!

 

I work with 6-point sockets/box wrenches ONLY!

Did you see the bolt specs I posted above?

Same specs Dorman part number below:

 

(10 pcs @$1.00 Each)

M10-1.5 x 30mm (10 pcs) Flanged Hex Bolt Screws Black Oxide Finish, 10.9 Grade Alloy Steel, Large Flange Washer Head, DIN6921/GB5789, Full Thread

M10-1.5 x 30mm (10 pcs) Flanged Hex Bolt Screws Black Oxide Finish, 10.9 Grade Alloy Steel, Large Flange Washer Head, DIN6921/GB5789, Full Thread

 

I'm going to take another look. If they fit then I'll definitely use them, but I thought I remembered that the standard hex head was going to be too big to fit. I'll come back with results though.

 

If it has a 10mm hex, then it is not a 10mm thread.

 

The Flange bolts in question have a 13MM head.

Per RockAuto.

GM GENUINE 15286596 Specifications
ACQ Rated No
FQA Compliant Yes
Finish Zinc
Head Diameter (IN) 0.777
Head Diameter (MM) 19.74
Head Drive Type Hex
Head Shape Socket
Head Tool Size 13
Heat Hardened Yes
Material Steel
SAE or Metric Metric
Self Drilling No
Self Tapping No
Shank Diameter (IN) 0.349
Specialty No
Thread Length (IN) 0.388
Thread Length (MM) 9.85
Thread Pitch (IN) 1.5 Thread
Type Coarse
Type Hex
Washer Attached Yes

 

Following up on results. I got a regular flanged 10mmx1.5 bolt, and although it just *barely* fits, it does fit. So this is the route I will go.
The head of this bolt is 15mm, and a 3/8 socket will be needed (don't think a 1/2 will fit), but should be fine.

@Doc Olds , I'm not sure if my bolts are not original, but the heads are definitely 10mm on my truck (2007 post transfer case fluid fill update).

@Justinh , a normal bolt head on a 10mm thread would not be 10mm, but these seem to be special bolts. The head is definitely the same size as the threads. I can only guess that was to give a bit more room to remove the bolts.

I believe the problem with my bolts has been the number of times I have had them out (CV replacement twice, trans fluid x3, and now a transfer case replacement, so 6 times), plus the fact that it is a 10mm hex head on the torque of a 10mm bolt (51 ft-lbs), they got rounded off. They are not beyond being used, but I don't want to get into a position of not being able to get them off in the future, and I like to stay ahead of stuff like this. I'm sure I wasn't perfect each and every time with the sockets, but I also was not being stupid with it either. So, I will replace them with easily obtained regular bolts instead of the $10/pc GM bolts.

I appreciate the input from everyone, and hope this can help someone in the future.

 

Thanks for the clarification and follow-up.