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Invest in 14 bolt or 10 bolt

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Old 01-06-2016, 11:21 AM
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Originally Posted by George C....
Rotating mass is known to rob power

Larger rears always take away power
Correct. That said, I would be surprised if simply swapping from a 10B to a 14B SF would result in whole number HP/TQ loss. Whatever loss there is would likely be trivial, but not huge.
Old 01-06-2016, 12:25 PM
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Originally Posted by GMCtrk
What would be the options for 15" wheverytgheels?
everything from the 10bolt swaps over
Old 01-06-2016, 12:26 PM
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Originally Posted by axisT6
Correct. That said, I would be surprised if simply swapping from a 10B to a 14B SF would result in whole number HP/TQ loss. Whatever loss there is would likely be trivial, but not huge.
spend any time around a dyno? if you did you wouldnt be doubting the loss

pay a visit to ls1tech and see back to back dyno pulls from a 10bolt to a 12 bolt or a 9"
Old 01-06-2016, 12:50 PM
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Originally Posted by George C....
everything from the 10bolt swaps over
No, I'm talking about the 8 lug version.

The 1/2 ton axn versions are too sparse and yard wants 1200. most have 3.73s. By the time I have a trutrac and 4.10s installed I'm well over 2k. Id consider the 8 lug version if I can save a lot over a 9" (3500)
Old 01-06-2016, 01:10 PM
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the denali 14bolt i got for my 2010 had 342s

I have a set of GM 410 gears for a 14bolt

my old SSS rear had 373s when i got it

you are right they are hard to come by but a GMT400 isnt as expensive and 1320 wheels sells the spacers to run on a gmt800 truck


id go 9" in heartbeat for my 2002 truck as for my 2010 i wanted a direct swap rear

the 10.5" 14bolt still uses a gov bomb
Old 01-06-2016, 01:32 PM
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Originally Posted by George C....
spend any time around a dyno? if you did you wouldnt be doubting the loss

pay a visit to ls1tech and see back to back dyno pulls from a 10bolt to a 12 bolt or a 9"
Well that was a learning experience. Looked at LS1Tech, LS1, and other forums. Losses were anywhere from 1-2 HP to 30HP (9"). One guy even said that after a swap, he lost 10hp but seemed to gain it back after the axle was broken in.....but I don't think you would do dyno pulls until after the axle was broken in....

Anyway, I will agree there will be losses with swapping to a bigger axle. For me, whatever loss there is going from a 10 bolt to a 14SF wouldn't be enough to discourage the swap.
Old 01-06-2016, 01:34 PM
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While we are the on the subject, whats the weight difference between a 10b and a 14bsf in stock form with no brakes (for both axles)?
Old 01-06-2016, 01:35 PM
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Originally Posted by axisT6
Well that was a learning experience. Looked at LS1Tech, LS1, and other forums. Losses were anywhere from 1-2 HP to 30HP (9"). One guy even said that after a swap, he lost 10hp but seemed to gain it back after the axle was broken in.....but I don't think you would do dyno pulls until after the axle was broken in....

Anyway, I will agree there will be losses with swapping to a bigger axle. For me, whatever loss there is going from a 10 bolt to a 14SF wouldn't be enough to discourage the swap.
you have been replying back for no real reason, im not discouraging the swap as i own 2 14b SF rears but the 10.5 FF sure isnt a rear id swap to for performance

the 9.5 rear is a nice option as its bolt in but once you get past the whole bolt in requirements its time to go to a 9"
Old 02-26-2016, 01:54 PM
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Bringing this back.

Does ANYONE know if there are any options for disc brakes on the 2500 version of the 9.5" that will clear 15" wheels? It is absolutely imperative that I be able to run my 15s.

AxisT6 will be able to build me a 14 bolt from a 2500 core for a good price, but as I am aware the axle tubes are bigger than my 10 bolt meaning that my caltrac lowers will no longer fit. And the 2500HD brakes have no chance of clearing my Bogarts. Caltrac probably sells the lower brackets to fit the 2500 axle, but I'm stumped on the brakes.

Other option is Ford 9" from Got Torque at around double the cost. But I believe I will be able to use my current backing plates and 1990 silverado brakes.
Old 02-26-2016, 02:20 PM
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If you know a machinist he can make the tube radius larger on the caltracs. That's what I did for my assassin bars since I have a 14b but they are designed for a 10b.

Any reason you cant run the 10b drums on the 14b?


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