Offroad Trailblazers and Envoys

4.56 part number

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by Jrgunn5150 » Mon Mar 02, 2015 5:10 pm

Is this it, YG GM 7.2-456R ? Because there's a few floating around and I'd like to grab a set, but everything says they don't fit the Trailblazer lol
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by Trail X » Mon Mar 02, 2015 5:22 pm

No, I think there has to be an IFS in the part number. R I think signifies a rear axle. If you have trouble, look for compatability with the S10 ifs.
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by Jrgunn5150 » Mon Mar 02, 2015 5:37 pm

Crossing it with the S10/15 Astro, that is the part number for their front diff. The "R" must mean reverse?

Also, it came up here in this site in a Google search lol
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by Trail X » Mon Mar 02, 2015 11:41 pm

Sorry, looks like you are right. I could have sworn mine said IFS in the part number when I ordered. Maybe that was my nitro gear set.
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by Jrgunn5150 » Tue Mar 03, 2015 12:56 am

It never hurts to double check lol... I should have bought the ones I saw for 175,they're all 250 now
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by Cable810 » Tue Mar 03, 2015 10:45 am

Look at USA standard gears. They are pretty cheap.
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by Jrgunn5150 » Tue Mar 03, 2015 12:07 pm

Cable810 wrote:Look at USA standard gears. They are pretty cheap.



As far as I know, Yukon is the only one who ever made 4.56's for our diffs, and they've discontinued them.

I checked their site and don't see anything listed, although I did contact them regarding a Spartan locker, since they make those for some pretty oddball applications
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by Trail X » Tue Mar 03, 2015 3:43 pm

My first front 456 gears were Nitro. The fact that they broke, however, had nothing to do with their quality. I would buy them again. USA Standard, from all reports are made by Youkon gears but might be a bit noisier than Youkons, but I've never seen a 456 front usa standard for us listed. I do have USA Standard in my rear axle.
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by Jrgunn5150 » Tue Mar 03, 2015 4:36 pm

Awesome, now I have two places to look lol, thanks!
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by Diacom » Tue Mar 03, 2015 10:06 pm

Jrgunn5150 wrote:
Cable810 wrote:Look at USA standard gears. They are pretty cheap.



As far as I know, Yukon is the only one who ever made 4.56's for our diffs, and they've discontinued them.

I checked their site and don't see anything listed, although I did contact them regarding a Spartan locker, since they make those for some pretty oddball applications


Sierra gears also makes 4:56 for our front, that's the best price/place I could find when I had 3 or 4 cancelations trying to get a set from other vendors.
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by Jrgunn5150 » Wed Mar 04, 2015 9:19 am

Woot! You guy's are great!
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