Gear Ratio?

[metalhead1049]

I'm looking to replace the gm 10 bolt rear in my truck with a 12 bolt, the junk yard up the street has one for $350 but it has 3.42 gears in it. Does anyone know how a '86 GMC C1500 with a 454 will do with these gears?

 

Thanks,

Kyle

[WilliamBos]

I'm looking to replace the gm 10 bolt rear in my truck with a 12 bolt, the junk yard up the street has one for $350 but it has 3.42 gears in it. Does anyone know how a '86 GMC C1500 with a 454 will do with these gears?

 

Thanks,

Kyle

 

What trans is in it??

[1AMike]

I'm looking to replace the gm 10 bolt rear in my truck with a 12 bolt, the junk yard up the street has one for $350 but it has 3.42 gears in it. Does anyone know how a '86 GMC C1500 with a 454 will do with these gears?

 

Thanks,

Kyle

 

What trans is in it??

 

 

Additionally:

 

What size tires do you run?

What do you primarily use the truck for? Towing, Racing, just cruising??

[metalhead1049]

It's a th400