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Old 04-24-2018, 08:59 AM
TheBreeze TheBreeze is offline
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Question Brake drum diameter

Is there a way to determine what the rear drum diameter is without removing the wheel and drum to measure? I want to order new ones before I tear it apart but every site asks me what the diameter is.

2004 4x4 XLT Super Cab 4.0L Automatic
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Old 04-24-2018, 11:02 AM
RoberticusMaximus RoberticusMaximus is offline
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Default Re: Brake drum diameter

measure the circumference and divide by 3.14

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fwiw i think the 9 and 10 inch drums look quite a bit different from the outside. i want to say 10s are smoother and 9s have little fins/ribs..., but i could be wrong on that. might help you during your investigation
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Old 04-24-2018, 11:21 AM
rwenzing rwenzing is offline
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Default Re: Brake drum diameter

It depends on the model and options. For example, in 2003, the base drums are 9". Adding any one or more of these options got you the 10" upgrade:

4x4
Edge
Supercab
Payload Package #2

Later years similar.

Basically, the 9" are only for 2WD regular cab XL / XLT with base payload. Since yours is a 4x4 S/C, it definitely has 10" drums.


As stated above, the 9" are finned on the outside, 10" are smooth.
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Old 04-24-2018, 11:39 AM
RoberticusMaximus RoberticusMaximus is offline
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Default Re: Brake drum diameter

woohoo!
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Old 04-24-2018, 11:55 AM
TheBreeze TheBreeze is offline
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Default Re: Brake drum diameter

Yes, that will work but then I'd have to buy a new tape measure.

I was hoping for something more along the lines of an axle code or an engine/body combo that always had 10" vs 9" drums.

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Quote:
Originally Posted by rwenzing View Post
Since yours is a 4x4 S/C, it definitely has 10" drums.
Thanks. That's exactly what I was looking for.
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