GMC Rear Axle ID Help: SP44 3.54

[chevychase]

Trying to get a little info off the SPID from a 67 GMC leaf rear. SPID says Rear Axle SP44 3.54 Gear Ratio and Part #3903540. Searched but couldn't find much so I'm seeing if you guys can help shed some light.

[chevychase]

OK, I kept on searching and looks like the GMC's got the Spicer/Dana rear ends. So the code SP44 = Spicer/Dana 44... makes sense.

[factorystock]

In the 50's and 60's GMC has many unique features till the product line aligned itself more with Chevy. Even though its water under the bridge now, the 3.54 ratio for 1/2 tons was a nice feature. This spicer axle and ratio was not a standard option for Chevy 1/2 tons in '67 and '68, unless there was a special order rear end under it. Chevy offered 3.07 3.73 and 4.11 as standard options.

[chevychase]

Originally Posted by factorystock

In the 50's and 60's GMC has many unique features till the product line aligned itself more with Chevy. Even though its water under the bridge now, the 3.54 ratio for 1/2 tons was a nice feature. This spicer axle and ratio was not a standard option for Chevy 1/2 tons in '67 and '68, unless there was a special order rear end under it. Chevy offered 3.07 3.73 and 4.11 as standard options.

Pretty cool and interesting. Am I correct in thinking the 12 bolt Chevys are stronger than the Dana 44 10 bolt? I thought I had something here when I saw Dana 44. In the Corvette world the Dana 44 is considered near bullet proof compared to the the Dana 36.