Will this work

[z7199]

I want to know if this will work in my 72' C20 2wd


click here

It is at the bottom of the page


GM 8-7/8'' 12-Bolt Truck, 30-Spline
109-5420105 64-82.5, 3.73-Up $332.99
109-5420107 64-82.5, 2.76-3.42 $332.99

[HugrOrang71]

The 12 bolt is a 1/2 ton differential. It won't work in your C20. They list a 14 bolt version, but it appears to be for a later model light duty version with a 9.5" ring gear.

[chevyfarmer]

I agree with the last post, looks to me like it is for a newer truck. Also, you might want to consider a different brand of posi unit. In that little picture next to my name is the 12 bolt out of my blazer project with a Auburn posi unit freshly installed. I joined the boards here shortly after that picture was taken and have many people say that the Auburn is okay...... but there are better options out there like a Eaton. Just my .02.

[z7199]

I am willing to go with a diffrent locker but dont have a clue on what to get. Or the size of it or spline count or anything. What about one of those POWERTRAX that replaces the spider gears on open carriers

[HugrOrang71]

I think the question should be do you need a limited slip or a locker? What are you using it for? What rearend does your truck have?
Lockers tend to be somewhat harsh for street use. Sometimes you get a little clunking and banging and some tire chirp on corners and under accel and decel. And they can be a handful on wet pavement or other slippery surfaces if you're not careful. I run a old style Detroit in the back of my Bronco. While it is a trail rig, I do drive it to work from time to time. I have learned to live with it's street manners because it works well on the trail. I wouldn't have one on something that is driven primarily on the street though.

A limited slip would be better suited for a street driven pickup. You don't even notice that you have one until it is needed. The Eaton is a decent unit that will take a lot of abuse. A gear driven True Trac is one of the better limited slip units available, depending on what differential you have.

[z7199]

Originally Posted by HugrOrang71

I think the question should be do you need a limited slip or a locker? What are you using it for? What rearend does your truck have?
Lockers tend to be somewhat harsh for street use. Sometimes you get a little clunking and banging and some tire chirp on corners and under accel and decel. And they can be a handful on wet pavement or other slippery surfaces if you're not careful. I run a old style Detroit in the back of my Bronco. While it is a trail rig, I do drive it to work from time to time. I have learned to live with it's street manners because it works well on the trail. I wouldn't have one on something that is driven primarily on the street though.

A limited slip would be better suited for a street driven pickup. You don't even notice that you have one until it is needed. The Eaton is a decent unit that will take a lot of abuse. A gear driven True Trac is one of the better limited slip units available, depending on what differential you have.

Yeah I would like the LSD but will live with a Locker I usally only drive the truck every now and then kinda like a sunday driver truck. I think the rearend is the dana 60 maybe not really sure but it is whatever it came stock with it.