9" swap? What does it take
Cargo Master
Joined: Jan 2004
Posts: 2,512
Likes: 8
From: Cook Forest and Irwin PA
....
...
(wait for it)....
"WRONG" coast...
heh heh
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
Look at my location, and you now know what it means.
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
Not at all. I know the pitch of the pinion teeth has to be adjusted to match the number teeth on the ring, and vice-versa. As well as occasionally the diameter or thickness.....
Cargo Master
Joined: Jan 2004
Posts: 2,512
Likes: 8
From: Cook Forest and Irwin PA
no sir. I just use the parts catalog. Im kinda a fan of matched stuff. seems to run quieter.... ;-)
Postmaster
Joined: Oct 2008
Posts: 3,026
Likes: 0
From: Renton, WA
Cargo Master
Joined: Jan 2004
Posts: 2,512
Likes: 8
From: Cook Forest and Irwin PA
not saying there isnt a part for a 42-12 9", I just dont have it...
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Postmaster
Joined: Oct 2008
Posts: 3,026
Likes: 0
From: Renton, WA
There are some ratios and tooth counts where the same teeth contact again and again, like a 3.0 with 27-9 or 2.5 with 25-10 there's a term for this like tracking or something that I can't remember nor if it's a good thing or not, would have to do more reading on it, I forgot, but you sure don't see it much.
Anyway, like in your 3.5 example a 35-10 would contact the the same 2 pinion teeth with every 7th ring tooth again and again. Now that I think about this any rather even numbered ratio would "track" like that. So a 3.50 would and a 3.55 wouldn't, hmm.
Thinking about the math, it would be true of any ratio which when expressed as a fraction could have the denominator reduced lower then the ring gear tooth count. So a 3.50 as either 10/35 or 12/42 can be reduced to 2/7 and thus the same 2 pinion teeth contact every 7th ring tooth. But a 3.55(3.5454) is 11/39 which cannot be reduced and thus does not track.
Anyway, like in your 3.5 example a 35-10 would contact the the same 2 pinion teeth with every 7th ring tooth again and again. Now that I think about this any rather even numbered ratio would "track" like that. So a 3.50 would and a 3.55 wouldn't, hmm.
Thinking about the math, it would be true of any ratio which when expressed as a fraction could have the denominator reduced lower then the ring gear tooth count. So a 3.50 as either 10/35 or 12/42 can be reduced to 2/7 and thus the same 2 pinion teeth contact every 7th ring tooth. But a 3.55(3.5454) is 11/39 which cannot be reduced and thus does not track.
Thread Starter
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Senior User
Joined: Apr 2010
Posts: 368
Likes: 3
From: Loganville, Ga
I have heard the terms:
Pig
Pumpkin
Center Chunk
The original question was mine. I wanted to know exactly what it would take to swap my 8.8" for a 9" out of a van or truck. I have my answer back on the first page. But PLEASE keep going, I am learning more than I hoped for about Ford rearends! This is great information!
Ed
Thread Starter
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Senior User
Joined: Apr 2010
Posts: 368
Likes: 3
From: Loganville, Ga
I haven't been able to get back to the junk yard but hope to this weekend. If I don't find a 9" that will work for me I'm going after the 8.8 with the limited slip. I have a question about that.
Would the 2.47 and 3.55 ring gears use the same 19 tooth pinion gear?
Since the 8.8LS at the junk yard is in a van it won't fit. I was wondering if I could just pull the carrier (the guts) and drop it into my rearend without having to mess with the pinion.
Would the 2.47 and 3.55 ring gears use the same 19 tooth pinion gear?
Since the 8.8LS at the junk yard is in a van it won't fit. I was wondering if I could just pull the carrier (the guts) and drop it into my rearend without having to mess with the pinion.
Postmaster
Joined: Oct 2008
Posts: 3,026
Likes: 0
From: Renton, WA
I haven't been able to get back to the junk yard but hope to this weekend. If I don't find a 9" that will work for me I'm going after the 8.8 with the limited slip. I have a question about that.
Would the 2.47 and 3.55 ring gears use the same 19 tooth pinion gear?
Since the 8.8LS at the junk yard is in a van it won't fit. I was wondering if I could just pull the carrier (the guts) and drop it into my rearend without having to mess with the pinion.
Would the 2.47 and 3.55 ring gears use the same 19 tooth pinion gear?
Since the 8.8LS at the junk yard is in a van it won't fit. I was wondering if I could just pull the carrier (the guts) and drop it into my rearend without having to mess with the pinion.
they match and both must be used