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S cam air brakes on 809 series

tobyS

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Has anyone upgraded brakes to s-cam air on an 809 series truck?
 

simp5782

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tobyS

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Thanks Wes, I didn't get correct terms in search.

There is a huge amount of info in that post.

If an 817 were made to 4x4 and 16.00 on it, going to air and s on the rear would seem to be good mod for safety. Are air lock differential available for 5 ton?
 

simp5782

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Thanks Wes, I didn't get correct terms in search.

There is a huge amount of info in that post.

If an 817 were made to 4x4 and 16.00 on it, going to air and s on the rear would seem to be good mod for safety. Are air lock differential available for 5 ton?
Yes @74M35A2 has em

If you are going 4x4 just use an fds1800 in the front and a HD meritot rear that will have Detroit lockers and s cam brakes already
 

tobyS

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Thanks Wes. Do you have either? Who does that has realistic prices? Can you expand both numbers, model, etc.. for me to locate.
 

simp5782

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I've got an FDS-1807, 18000lb capacity. 6.17 gears. Budd. Hub to hub. 72c drive yokes Has wedge brakes cause that's common on steer heavies. $1500. With springs/hangars and steering cylinder $2000

I've got a a meritor SUHD meritor unit. 6.17 with. Detroit . S cam. Hub to hub budd. 1710 series yoke. $2000

You can find the heavy mrap springs at auction


Both of those prices include shipping
 

74M35A2

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$2500 if you want a selectable air locking 5t rear axle. Has 5.8x ratio and hydro brakes but M939 air backing plates bolt right up to them as well.

I have all 3 positions, and 2 Detroit Locker nuggets for 5t as well.
 

tobyS

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How about a selectable diff air locks with wedge air and 6.17 gears??? The ratio of 809'appears to be 6.44 and I see gear sets for the 6.44 ratio are available at reasonable cost....wonder about a 6.17 set of gears to match the Meritor?
 

simp5782

Feo, Fuerte y Formal
Supporting Vendor
12,088
9,248
113
Location
Mason, TN
How about a selectable diff air locks with wedge air and 6.17 gears??? The ratio of 809'appears to be 6.44 and I see gear sets for the 6.44 ratio are available at reasonable cost....wonder about a 6.17 set of gears to match the Meritor?
Doubtful on gears

TracTech Inc makes em.

I' know you can since the front tandem on the 916s is an air locker.
 
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