ZR2 rear end??? - Blazer Forum

Millertime21 · #1 12-12-2007, 05:52 PM

I was reading that a ZR2 rear end is a nice upgrade for non-zr2'srear ends, because its a 8.5" instead of 7.5" making it stronger. Just wanted to know if its a direct bolt in? Right now I have 3.42 gears so could I have 3.73/4.10 in back and 3.42 of front, or would that not work? And lastly would the front diff. from a ZR2 bolt right in so I could have matching gears and are the fronts of a ZR2 any stronger than in a stock 96 blazer 4-door? Sorry for all the questions, but any help would be great. Thanks

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**mdehoogh** · #2 12-12-2007, 05:59 PM

you cant really use two different gears in the front and the back... one axle would be spinning faster than the other = transfer case will die

drperry · #3 12-12-2007, 07:14 PM

The ZR2 axle is also a little wider, if I remember right...

Any 2nd gen Blazer with a 5 speed should have the 8.5" and the iron front diff.

Millertime21 · #4 12-12-2007, 07:29 PM

Thanks. Also since I currently have drum brakes on the rear, do I have to do anything to make the disc brakes on a ZR2 rear end work?

**Hanr3** · #5 12-12-2007, 10:36 PM

Yes, and good question.
You will need to change the master and the proportioning valve. Drums require less pressure then discs. Take them from teh donor truck.

Idriveachevy · #6 12-12-2007, 11:24 PM

Are you hacking up a Zr2? if so, send me pm i want to tlak to you about some stuff.

felonyblazer96 · #7 12-12-2007, 11:25 PM

i am hacking up a zr2 any info would be appreciated

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Millertime21 · #8 12-13-2007, 02:26 AM

Quote:

ORIGINAL: Hanr3

Yes, and good question.
You will need to change the master and the proportioning valve. Drums require less pressure then discs. Take them from teh donor truck.

Thanks, I had to do that on my camaro, butwasn't positive if it was the same for blazers.

Millertime21 · #9 12-13-2007, 02:27 AM

Quote:

ORIGINAL: Idriveachevy

Are you hacking up a Zr2? if so, send me pm i want to tlak to you about some stuff.

Nope, but I'm going to go junkyard shoping in the next week or two and see what I can find.

drperry · #10 12-13-2007, 06:26 AM

Well, if you insist on using an axle from a ZR2, then at least your rear wheels will stick out at least as far as the fronts, lol.

The track width of a ZR2 is wider, you might run into some issues with that.

I have the 8.5" diff, and I'm not a ZR2 [8D]

There's a few 4 doors that have it too... Jigg found one awhile back, lol, even had 3.42's in it.