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Discussion Starter · #1 ·
Sorry, I really did try and get this info from the archives but couldn't find it. I currently have a 1300 final drive coming for a swap on my 2002 1800c - it's shipping with the pumpkin and a drive shaft. My question: does the swap require both parts or are the shafts the same on both models? Thanks!
 

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It pops right in. Unless your shaft was damaged, leave it off for the swap.
 

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2003 VTX 1800S, 2010 Goldwing, 2009 Spyder GS
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I’ve been told the 1300 on the 1800 drive makes for better RPMs at highway speeds, less looking for 6th gear. I wouldn’t mind trying it myself some day.
 
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2003 VTX1800R
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I wouldn't mind doing that myself. I just went with a lower profile tire (180-60-r16 instead of the stock 180-70-r16) and would like to get my RPMs back below what it put the engine at. I've been working toward getting the bike down to where I am comfortable with the height. It's pretty good now, but I'm still going to install air ride in the back.
 
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2002 Honda VTX 1800 C
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I wouldn't mind doing that myself. I just went with a lower profile tire (180-60-r16 instead of the stock 180-70-r16) and would like to get my RPMs back below what it put the engine at. I've been working toward getting the bike down to where I am comfortable with the height. It's pretty good now, but I'm still going to install air ride in the back.
Yep, in effect you geared your bike down with a smaller tire diameter.
 

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2003 VTX1800R
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Yep, in effect you geared your bike down with a smaller tire diameter.
I have found 1300 differentials for sale and they are pretty in expensive. I think I'll get one. If I like it then great and I can sell the 1800 differential. If I don't then I can reinstall the 1800 and sell the 1300 differential. I think I'll be happy with the 1300.
 
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2002 Honda VTX 1800 C
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I have found 1300 differentials for sale and they are pretty in expensive. I think I'll get one. If I like it then great and I can sell the 1800 differential. If I don't then I can reinstall the 1800 and sell the 1300 differential. I think I'll be happy with the 1300.
How much do they sell for? The ones for a Valkyrie, which are on the right side (they call them pumpkins), sell for around $500 used. What Valkyrie guys normally do is rebuild them but that is one can o’ worms I would never open 😊
 

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I read somewhere on this forum that the final drive gearing is different on a 1300, isn’t it a little taller than the 1800’s?
1300 - 2.8
1800 - 3.1
 

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2003 VTX1800R
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How much do they sell for? The ones for a Valkyrie, which are on the right side (they call them pumpkins), sell for around $500 used. What Valkyrie guys normally do is rebuild them but that is one can o’ worms I would never open 😊
I was just looking on eBay and found several below $100 and a few just over $100
 

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Overhauling a drive unit (diff.) is really not that difficult. But you don't need to. It seems there are 13 drives to be had with relative ease. I have been running the 13 final for MANY years and tens of thousand miles. I would never switch back. But, I do 90% of my riding one up. And most of it is out on the road stuff. Was never a big stop light to stop light guy (though it can sure be fun). I've always liked running out the gears. Easily over 100 mph (indicated, stock speedo) before banging 5th. I kept my 18 final. Probably has about 20,000 miles on it. Don't expect a HUGE difference but, it does change the nature of the bike a little..
 

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2002 Honda VTX 1800 C
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Should of been that way from the beginning ❗
I don’t know, I like the way my stock 1800 is geared, but I don’t have anything to compare it to. On another thread they’re talking about clutches slipping — I tell you, mine doesn’t slip and the bike rockets from 50 to 80 mph in about 2 1/2 seconds LOL
 

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2003 VTX1800R
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It’s late and I’m OCD so bear with me. LOL This is for the 1800R and these are the calculated speed differences between 1800/1300 gear, the 70 series stock tire and the 60 series I put on it.

1800 gear with 180-70-R16 and 180-60-R16
Font Screenshot Gadget Electronic device Games
Font Screenshot Electronic device Gadget Terrestrial plant

1300 gear with 180-70-R16 and 180-60-R16
Font Screenshot Electronic device Terrestrial plant Circle
Font Screenshot Electronic device Gadget Terrestrial plant

I think I’ll be pretty happy with my lower profile tire and the 1300 gear. It puts the speed output closer to factory with a slight highway advantage which is where I spend most of my time riding.
 
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Should of been that way from the beginning ❗
When the VTX1800 came out in 2002 it was the largest displacement production V-Twin in the world.
It was a hotrod. The lower gears made it a little quicker in a drag race situation.
Similar to the old 60's vintage muscle cars with a big block, 4-on-the-floor, and a lower gear ratio differential.
I've been running a 1300 FD for years, and I like it better.
 

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Discussion Starter · #20 ·
I received my 1300 final drive and have been cleaning it up. Looks like it's in really good shape, just a few little marks. It seems very similar in looks to the 1800, what can I check to confirm it's a 1300 final drive?
 
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