Differential?? 273s or 323s ???

**Rikki_SeVeN** · 06-14-2007, 11:32 AM

ok...so...I'm not a mechanic...and even though I try to keep up with my tech as much as I can...

I still have no Idea what Gears my rear end has... and what's the difrence between the gears...and what makes the 10-bolt so weak? or lesser to a 12-bolt or whatever?...

So if I could get some clear cut answers or links to some good informational reading for dummies... I'd appreciate it...

btw... it's a Automatic... from 1999... Z28...

**PFM** · 06-14-2007, 11:47 AM

Look on the drivers door at your build codes/

GU2-2.73s
GU4-3.23s
GU6-3.42s

How bout that?

**Rikki_SeVeN** · 06-14-2007, 11:48 AM

gonna be hard to do... the last owner pretty much shredded the codes on the door...and how about the rest of the questions?

**Rikki_SeVeN** · 06-14-2007, 11:52 AM

it's kinda hard to tell but I think it says GU5...

**2001NBMZ28** · 06-14-2007, 12:03 PM

GU4 is 3.08. Has to be either GU2 (2.73) or GU5 (3.23). See if it has an alum drive shaft, although it could've been changed. You can also check out a calculator like www.f-body.org/gears/

**67CamaroRSSS** · 06-14-2007, 12:04 PM

Current 10-bolt in you car has a ring gear diameter of 7.5". Compare that to a 12-bolt which is 8.875" or a Ford rearend which will have a ring gear diameter of 8.8" or 9". As your car gets more powerful (drivetrain wise - and that includes suspension. i.e., control arms, torque arm, etc.) heavier duty items tend to take the punishment better. They don't call them "Severe or Heavy Duty" parts for nothing.