there is no sticker in the glove box of my 1996 blazer, 2 dr. i'm trying to identify the rear. I found these numbers stamped on it but don't know what they mean, any help is appreciated! one stamped along the bottom on the side where the drive shaft bolts is '26041413' and another one on top stamped '277' there was also a stamp 'gm' with an unidentified number along with it

 

Auto or 5 speed?


If auto then it's most likely the GM 7.5"





If it's 5 speed it could have a GM 8.5"





If you're asking about gears, most common are 3.42's

 

What is it and what is the gear ratio

 

[QUOTE=BlazerBuilder;626175]there is no sticker in the glove box of my 1996 blazer, 2 dr. i'm trying to identify the rear. I found these numbers stamped on it but don't know what they mean, any help is appreciated! one stamped along the bottom on the side where the drive shaft bolts is '26041413' and another one on top stamped '277' there was also a stamp 'gm' with an unidentified number along with it[/QU myOTE]

 

Refer to Jamaroon's post about the size, it's most likely a 7.5. But as far as the gear ratio goes, without the sticker in the glove box, the only other real way to find out is to either call a dealership and have them decode the vin (if you physically go to the dealership, they might even be kind enough to print you out a sheet with all the RPO codes on it for you Blazer per the VIN), or pull the diff cover off and see what numbers are stamped into the side of the ring gear.

 

I'm guessing he probably figured it out by now.