Front Differential Information

On Rock auto .com, it lists Genuine GM AC Delco parts for ZR2 diesel & non ZR2. Part #'s are different. Must be different for a reason. ZR2 # 84275040 & 84208836. Non - ZR2 # 84275039.

Dana 32 front, I think ?
Dana 46 rear, I think ?

Spline count on front cv shafts, Inner: 39 spline. Outer: 37 spline.

Not sure if this info is for ZR2 diesel only or all Colorado's.

Dana 32 / M200, 7.25" R&P
Don't know what that means, its notes I took when the info appeared

2019RedZR2 said:

Spline count on front cv shafts, Inner: 39 spline. Outer: 37 spline.

Click to expand...

39 & 37 spline = Pretty impressive.

Iamscotticus said:

Dana 32 / M200, 7.25" R&P

Click to expand...

7.25" R&P = Not impressive

I would call Dana, 589 Fab and ARB to see what works.
This is interesting:
"My understanding is they are a new generation Dana/spicer axle. The front is a Dana M200 (200mm ring gear diameter). The rear axle on the ZR2 and non-zr2 V6/diesel trucks is the Dana M220(220mm ring gear diameter), while the 2.5l 4cylinder trucks get a M210 rear axle. That is why the 4.10 gears from a 4 cylinder truck won't swap into the ZR2. Nitro Gear is calling them a Dana 32 and a Dana 46. You will also notice the new JL wrangler shares some of these axles, which might bring some aftermarket support for us.
I would compare the front axle to a Dana 30 and the rear to a Dana 44."(ZR2)

200mm = 7.87in
220mm = 8.66in

in case someone asks.

Not bad for rear gear size, imo.

Also, something to remember is: the weakest link. It is MUCH CHEAPER to replace a cv axle shaft than the differential/housing/ring & pinion gears.

I think I am genetically predisposed to make things more heavy duty, yup, I think it's in my DNA. Lol But with a Colorado, I have to keep reminding myself that while RCV front cv axles would be bulletproof, it just changes the weakest link from a relatively cheap, trailside fix (providing you have the part & tools & knowledge), to a stranded on the trail, need to be towed off type of situation with a heavy cost. Not to mention if you crack the housing, gear oil could leak out on the trail.