Derek 357i

iTrader: (1)

I am mating my Camaro 3" driveshaft to my BMW differential input flange via a flange yoke from Rockford Driveshafts. The flange yoke has 4 bolt holes that match the four bolt holes on the diff input flange. There is a raised portion in the center of the yoke which is round and mates inside the input flange to keep the shaft exactly centered. Therefore, all of the torque being transferred to the rear wheels is being transferred as shear force into these 4 bolts.

I am wondering if I should use 10mm titanium bolts or 6AN airframe bolts. Any thoughts???

Lesrace82

iTrader: (8)

This is off topic, but do you live in Rockford?

Derek 357i

iTrader: (1)

Nope, I live downstate in Galesburg.

My thoughts on the two are these:

<font color="green"> Titanium <!--color--></font>
Pros
Incredible Tensile and Shear Strength
Lightweight
Predrilled for safety wire
Uhhh.... It's titanium <img src="https://ls1tech.com/threads/images/graemlins/cool.gif" alt="" />

Cons:
Cost
The threaded portion of the fastener will be in the stressed portion of the flange, so there may be some galling effect on the hole, possibly causing hole enlargement.

<font color="green"> Airframe Bolts <!--color--></font>
Pros
Can order by grip length in 1/8" increments to keep threads out of loaded area.
Plenty strong (approved by FAA for use on aircraft unlike SAE graded fasteners)

Cons:
Need 10mm bolts and available in 3/8" or 7/16"-- give up some thickness with the 3/8" and the 7/16" are too big (don't really want to enlarge holes and remove material where there is already just barely enough.)
Not titanium <img src="https://ls1tech.com/threads/images/graemlins/grin.gif" alt="" />