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Rear Drum Brakes To Factory Disc Swap?

Mirage775

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Mirage775 Enthusiast

Mirage775

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I am unsure if this will work or not but, was hoping I could find an answer here before I tried. I have found a complete 3.42 disc rear end from an 04 Silverado, 2wd 1500 for $625 on ebay, less than 50 miles from me. My questions are, is this a good price? And is this a direct bolt on for my 07 Classic Sierra? I've never been that good with gear ratios so, if mine is currently a 3.23 ratio, how would the 3.42 affect me? More torque and less mileage? I'm also running 20" wheels. Any help would be appreciated? Thanks, Jason

 

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Zembonez Senior Enthusiast

Zembonez

Posted
Posted
I am unsure if this will work or not but, was hoping I could find an answer here before I tried. I have found a complete 3.42 disc rear end from an 04 Silverado, 2wd 1500 for $625 on ebay, less than 50 miles from me. My questions are, is this a good price? And is this a direct bolt on for my 07 Classic Sierra? I've never been that good with gear ratios so, if mine is currently a 3.23 ratio, how would the 3.42 affect me? More torque and less mileage? I'm also running 20" wheels. Any help would be appreciated? Thanks, Jason

 

I couldn't post this in the how to section, it kept saying I wasn't authorized to post. Please move this wherever it needs to be? Thanks

 

I think the 04 housing is a direct bolt in fit for your 07 classic. Keep in mind the fact that there will be differences in the brake system between disc and drum brake systems... and emergency brake setups.. I would pass. Disc brakes are not going to improve your brake feel and it is quite debatable whether they would offer any better performance at all.

alwcurlz Enthusiast

alwcurlz

Posted
Posted
I am unsure if this will work or not but, was hoping I could find an answer here before I tried. I have found a complete 3.42 disc rear end from an 04 Silverado, 2wd 1500 for $625 on ebay, less than 50 miles from me. My questions are, is this a good price? And is this a direct bolt on for my 07 Classic Sierra? I've never been that good with gear ratios so, if mine is currently a 3.23 ratio, how would the 3.42 affect me? More torque and less mileage? I'm also running 20" wheels. Any help would be appreciated? Thanks, Jason

 

I couldn't post this in the how to section, it kept saying I wasn't authorized to post. Please move this wherever it needs to be? Thanks

 

If your Sierra is a GMT800, it should bolt up to your truck. Wheel size won't matter so much as long as it's a 16" or larger to clear the braking components. Still, whether you have 16" or 24", the total height is what counts. If total height is about 31", you're fine in the braking power needed. Good price on a rear end would depend on how many miles are on the unit and if it's been rebuilt. Any ratio higher than what you have will give you more torque and use more fuel at higher speeds but, if this is for extra braking performance, you'll notice a difference with disc brakes, especially if you're towing/hauling extra weight.

Mirage775 Enthusiast

Mirage775

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Posted

Thanks guys. He says the rear end has about 76k miles on it. I was looking at Bear drum to disc kits and they're like $1500+ But, all in all, I think I'd be better off buying the Bear kit, what do yall think? I eventually want to do a magna charger or some pricey engine bolt-ons and was curious if I needed better braking on all corners?

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