Locking differential option on my Blazer

[eighteenninetytwo]

in checkign my SPID turns out that my Blazer originally HAD a locking differential on it form factory.
Questions:
1. Were these just at the rear?
2. Am I right to assume that this was an automatic locker and only engages IF one wheels is starting to spin (in mud maybe?)
2. How do I determine if this is still fitted or has been replaced with another differential?

[buffydores]

Originally Posted by eighteenninetytwo

in checkign my SPID turns out that my Blazer originally HAD a locking differential on it form factory.
Questions:
1. Were these just at the rear?
2. Am I right to assume that this was an automatic locker and only engages IF one wheels is starting to spin (in mud maybe?)
2. How do I determine if this is still fitted or has been replaced with another differential?

What year is your Blazer? The factory unit would be the infamous Eaton G80 Gov-Lock. Has a tendency to grenade the whole carrier under full throttle situations. You'd need to pull off the cover to identify it. If you want to feel confident I'd recommend a Detroit Truetrac to replace it.

[eighteenninetytwo]

1975 K5 Cheyenne !! its had lots done to it over the years, (some of it even good), so i can't be sure the rear diff isn't replaced anyway. What would I look for??

[68Timber]

Here's a pic. They break pretty easily if you spin the tires much.

[eighteenninetytwo]

I assume that there were different available ratios on these? My SPID states 3.73 Ratio.

[68Timber]

Yes.