Quote:
Originally Posted by pjmoreland
I may be wrong about this, but I believe the wider rear ends had GM54 cast into the center housing, whereas the narrower design was GM51. That's how it was on a wide 1970 housing I sold recently vs. a 1968 housing I purchased to replace it. Measuring the width of the rear end would be the conclusive way to tell.
https://www.67-72chevytrucks.com/vbo...d.php?t=578793
Copied from the thread below:
axle width is 55.5 wide with 30.5 long axles on the narrow rear end. earlier rear end
axle width is 57 wide with 31 5/16 long axles on the wider rear end. later rear end
http://67-72chevytrucks.com/vboard/s...d.php?t=640514 |
The cast number on the center housing on mine says GM66. And now that i think about it, the axles appear to be original and they are 5 lug, a 67 should have been 6 lug. Another indication that it is indeed a later one