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Discussion Starter #1
Title says it all i was wondering what was the limit in our rear ends i have 3.73s.
 

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Normal driving... Probably twice OEM...
Anything else... Less than stock...
Good luck with your project !!!
 

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Tweek, has is exactly right. With a manual trans, big clutch, & fat sticky tires a stout I4 could break it after a while with a lot of abuse. On the other hand I expect the rear axle to last forever in my I5 manual trans because I never abuse the drive train. I tow very heavy loads and frequently (but gently) use every bit of power available. With a conservative driver and automatic trans it could probably live a long life with a 300HP V8.
The housing on these axles is aluminum and they are not rigid enough to withstand heavy shock loads. If you want to go drag racing just put in a 9" Ford.
 

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Wheel hop can kill the best rear end. its all about how you drive it and how it is set up. the Corvette ran a cute little dana 36 (very weak and small diff) but they set the suspension up to corner. so its hard to shock that rear end resulting in a rear end that can last 300,000 miles with 300 hp. and I have seen 600hp run through them with no problems. The Colorado suspension is terrible for performance wheel hop is easy. shocking this drive train is easy. it all depends on how its driven.
 

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Discussion Starter #5
Yeah i won't be getting any wheel hop since i got some caltracts but i do have a 5.3 with a 4l80e that im in the process of putting a turbo on it
 

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I run a lot of HP thru the 8.5 10 bolt
in my Buick GN, slicks and drag radials
on the street. just have a set of after market
axles and R&P in it. The 8.6 in my Colly
should hold up well for what i do with it.
it's the same as in a Silverado. The HD's and
Duramax's get bigger rears. I prob will swap
out the axles and the weak G80 down the road.
 

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I run a lot of HP thru the 8.5 10 bolt
in my Buick GN, slicks and drag radials
on the street. just have a set of after market
axles and R&P in it. The 8.6 in my Colly
should hold up well for what i do with it.
it's the same as in a Silverado. The HD's and
Duramax's get bigger rears. I prob will swap
out the axles and the weak G80 down the road.
What axle shafts do you use/recommend for the 8.6?
 

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Dura Blue sellls a nice priced set, Moser and
the other big companys are a little more pricey.
 

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Discussion Starter #9
I run a lot of HP thru the 8.5 10 bolt
in my Buick GN, slicks and drag radials
on the street. just have a set of after market
axles and R&P in it. The 8.6 in my Colly
should hold up well for what i do with it.
it's the same as in a Silverado. The HD's andp
Duramax's get bigger rears. I prob will swap
out the axles and the weak G80 down the road.

How much hp have you ran through tje colorados rear end?
 

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How much hp have you ran through tje colorados rear end?
around 410 is the max you want to go in regards to the rear end. transmission aswell, the chevy colorado has a weak transmission its only good for, in my opinion 450 maybe 500 pushing it if you drive her like a granny. and the engine around the same now if you have deep pockets they sell a cadillac engine that drops in, youll need a new wiring harness or an adaptor but that engine is good for 750hp.
 
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