Question about my rotors and rear axle shafts

[Graham_Bird]

Hey Guys I'm new to the forum. I'd rather the bolt pattern for my 1992 C1500 was the more standardized 6x5.5in as I could find new wheels easier than with my 5x5in pattern. I've found online that there are conversion kits for the front brake rotors on older year model C10s (1960-78), and I'm wondering if rotors from these year models could be made to work on for the next generation(1988-98)? Also, looking into the rear axel shafts I've found that the K1500 shares the same 30 spline count as the C1500, however the shaft is 1 inch longer. Also wondering if these could be made to work. Curious if it would even be worth the effort. Other perspectives would be appreciated. Thanks

 

[andremora71]

I have the same question as you ! No has answered:/ . I want the 6 lug pattern on my truck for the rear . I want to put newer style GM truck wheels that have the 6 lug pattern .

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[Jglew82]

GMT400 C2500 light duty has the 6 lug x 5.5 rotors and are a direct swap to your C1500 spindles - uses same exact brake hardware. For the rear, you can do one of several things: 1: get a rear axle out of the same C2500 LD 2wd which is a 9.5" semifloat with 6x5.5 hubs with the same track width as your 1500. 2: look for a 4x4 1500 (8.5 or 9.5 options) or 2500LD (9.5) axle which will all be 6x5.5, but the track width will increase. 3: have your axles custom drilled for the 6x5.5.

I'm looking to do a 9.5" axle swap and 6 lug rotors on the front of mine as well since I LS swapped it and want a beefier rear end.

 

[andremora71]

I was actually considering the c2500 front rotor swap for the c1500. Only reason why I didn't do it because I I wasn't going too the use factory brake calipers , I'm actually in the process of utilizing a 2005 Chevy astro van steering knuckle that has gmt 800 truck front brake calipers and rotors , only thing I'm waiting on is for my local machine shop to drill and taper out the holes bigger for the ball joints and tie rod ends since the ball joints on our GMT 400 trucks are a tad bit bigger than what the astro Van's have. With that done I'm going to have dual piston calipers on the front and have the ability to upgrade too the wilwood big brake kit in the end . The rear has been something I've been researching for, I came across a fella on YouTube who managed too bolt on the 2kxx 2014-2018 truck rear brakes on too his 8.5 10 bolt rear end on his 1997 k1500 Tahoe, he now has newer style truck brakes and still is able too use the factory parking brake . That's why I want to use a k1500 rear end on my c1500 truck. I know the axle widths are different from the c and k trucks . What I want to know is , will the rear axles swap ? Will the leaf spring perches and the shock tab mounts bolt on ? I dont mind having a wider track width, the front will already be taken care of . I also want to be careful when changing the rear end. I dont want the rear to be dog tracking . Oof trying too find a rear end on a c2500 is gonna be something not so easy to come by. Although I wouldn't mind the extra strength from the 14 bolt. Then again I won't be able to do the rear disc brake conversion that I wanna do. Thanks for replying back!!

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[andremora71]

Here's what I got going for the front. Just the rear is what I need

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[Jglew82]

What I want to know is , will the rear axles swap ? Will the leaf spring perches and the shock tab mounts bolt on ? I dont mind having a wider track width, the front will already be taken care of . I also want to be careful when changing the rear end. I dont want the rear to be dog tracking . Oof trying too find a rear end on a c2500 is gonna be something not so easy to come by. Although I wouldn't mind the extra strength from the 14 bolt. Then again I won't be able to do the rear disc brake conversion that I wanna do. Thanks for replying back!!

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Yes, the rear axles will swap between GMT400 C and K models. Mounting points are the same. If you are looking for the wider 4wd rear, then you can choose between a 14bolt and a 10bolt for the 1500's, you just have to see what's out there. If you get the 14 bolt, get the leaf brackets and new u bolts to go with it, they are different than the 10 bolt. Also, you will need either a conversion rear u joint, or swap the yoke from your 10 bolt to the 14 bolt. Lots of write-ups on this

Also... Super interested in this Astro knuckle swap. Make a post when you're done and tested?

 

[andremora71]

I got quoted from a local salvage yard for a used rearend off a k1500 Silverado for 250$.if what you're saying true about that they bolt on then I just might have too do it [emoji120]. Yeah definitely will post about it , I saw another post of a fella who did the same but he used the AWD astro vans steering knuckles on his k1500, the front suspension on thoes trucks are different of course compared too the c1500's.he actually managed too get it done now he has the gmt 800 front brakes . This mod isn't difficult at all , the only problems that I've run into so far is trying to find a machine shop that'll do the work because most machine shops aren't equipped too do what I need to get done. I had to stop by 4 shops and on the 5th stop I finally found a shop that's willing to get it done , currently I'm waiting on a guess estimate , dont really know how much they're gonna charge for me for the work since it's a unique and tedious task , trying to get the knuckles on the mill , trying to hold it in place is gonna be hard apparently. The shop rate for them is 100$ an hour they have to machine 6 holes , 3 different sizes so I have no idea how much its gonna cost me . I'll definitely go into detail about it once I get it done . The steering knuckles cost me 115$ bucks from the salvage yard , I had to buy new lower , upper ball joints and tie road ends from the parts store which were 90$ since the machine shop needs the measurements for the hole diameter and taper degree . I had other people tell me too just swap out the ball joint from the astro but I have no idea how that's gonna work out since we are talking about a pressed in ball joint and then a bolt on ball joint on the top. Currently the project has come to halt, until I get a word back from the machine shop , if it comes out too expensive I'll have to figure out another remedy. I also talked too my local alignment specialist that I know and he told me I shouldn't have an issue with aligning the truck with the different knuckles.

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[Jglew82]

Well, good luck with it. Sounds like it will be a very worthwhile swap! Definitely looking forward to reading about it.

 

[andremora71]

Well, good luck with it. Sounds like it will be a very worthwhile swap! Definitely looking forward to reading about it.

Hey i wanted to know if theres anything I should know before I swap a k1500 rear end into my 1991 c1500? Anything that you know that I should take into consideration? Looking for the 10 bolt 8.5. 6 lug 4x4. Btw I'm still working on the astro steering knuckle swap . Will do a write up once done

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[454cid]

Hey i wanted to know if theres anything I should know before I swap a k1500 rear end into my 1991 c1500? Anything that you know that I should take into consideration? Looking for the 10 bolt 8.5. 6 lug 4x4. Btw I'm still working on the astro steering knuckle swap . Will do a write up once done

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The 4x4 rear axle will be wider... What Astro knuckle? There is the AWD knuckle that is setup for better brakes, but I think the 2wd is B-body or S-10.