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Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       03-02-2010, 8:54 AM Reply   
Any tips for removing a walter v-drive from my Centurion Avalanche? Anyone ever changed the gears themselves? I am going to change out the gears to the new ratio, from 1:1 to 1:146 This should help with what weight I am running. Walter says it's not a hard project. Model number is RV-26D. Any help would be great!

Thanks

Duffy
Old    AtTheLake (bmartin)      Join Date: Jan 2007       03-02-2010, 11:39 AM Reply   
If gear reduction is what you are after, I would keep trying lower pitch props before doing major surgery unless there is another reason to pull the tranny.
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       03-02-2010, 11:57 AM Reply   
I have the lowest pitch prop out, it's a custom acme 911. My boat has 1:1 ratio so I would like to change it to what most boats have now. 1:1.46
Old    Darren Yearsley (ralph)      Join Date: Apr 2002       03-02-2010, 12:11 PM Reply   
What is your shaft diameter? I thought that drive reduction ran 1&1/4" and 1:1 ran 1". Are you worried the extra torque of reduction will twist the shaft?
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       03-02-2010, 12:30 PM Reply   
It's the exact same v-drive and shaft. You only change 1 gear in the v-drive. Centurion and a lot of boats come with the 1:1.46 ratio now. Basically from what I read, boat manu had to change the ratio because of how much weight people run etc..
Old    Nate (norcalmalibu)      Join Date: Jun 2004       03-02-2010, 1:50 PM Reply   
Well before you go ripping out your tranny..What are you looking to accomplish?

What type of motor? You're going to loose alot of top end going to that ratio.

How much weight are you running?
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       03-02-2010, 2:13 PM Reply   
I mainly surf and I would be changing to a diff prop for better top end, but mostly so the boat doesn't have to work so hard. I run around 2k for surfing and my 315hp motor is about maxed out. Acme props is actually who suggested the move.
Old    Nate (norcalmalibu)      Join Date: Jun 2004       03-02-2010, 3:16 PM Reply   
I'm assuming the 315 is some sort of TBI motor? Depending on what you want to spend you can look at stainless steal headers, Heads, blower etc.

One thing to consider once you pull that tranny out is if you've been running 2000lbs of weight you might want to consider doing a rebuild.
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       03-02-2010, 3:27 PM Reply   
Boat runs great. The ratio is something boat manu changed to a few years back. I can get a brand new v-drive with the correct ratio for around $800. I bet it will save me close to that in gas the first summer of heavy use.
Old    TigeMike (chpthril)      Join Date: Oct 2007       03-02-2010, 3:59 PM Reply   
When was the last time you talked to ACME? They are working on a new prop that is similar to the 911, but geared toward the surfing. Call and talk to Bill Weeks.
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       03-02-2010, 5:07 PM Reply   
That's basically the prop i have in the classified section. It's just a more extreme 911.
Old    Trace (trace)      Join Date: Feb 2002       03-03-2010, 7:02 PM Reply   
Not sure why everyone is down on this. Makes a lot of sense to me. It should not be that difficult. Remove all the interior that is anywhere near being in the way for access and to keep from tearing it up. After that it should be about 8 bolts and a couple hoses and wires, and the V-drive should be in your lap.

Headers and a blower, you're talking $8000+ instead of $800, probably very little improvement down low in the RPM range where you need it, and less reliability to boot.
Old    M-Dizzle (liquidmx)      Join Date: Jun 2005       03-03-2010, 7:50 PM Reply   
I am with Trace. Since he is not messing w the motor mounts the alignment shouldnt be an issue. I would go ahead and invest in a dripless shaft while you are at it...along with replacing the clutches in the tranny (if you dont go new) and the seals. Aside from that remember to follow some break in procedures with the new or newly rebuilt tranny. Heck I would even look into modding the bottom of the tranny with a drain so you can do more thorough oil changes.
Old    Trace (trace)      Join Date: Feb 2002       03-03-2010, 8:11 PM Reply   
The V-drive is actually separate unit from the tranny. He should be able to pull the Vdrive alone, which is about the size of a (solid steel) shoe box.
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       03-04-2010, 7:31 AM Reply   
Well I bought a new v-drive from centurion. It's old new stock and I picked it up for $750. This will allow me to change my prop from a 911 to a acme 1579. This should increase water bite and also improve my boat by up to %50 overall. At least that's what acme and centurion say. Centurion says it's a 2 hour or less project. Just a few boltls etc.... I thought that the prop shaft was aligned at the v-drive?
Old    M-Dizzle (liquidmx)      Join Date: Jun 2005       03-04-2010, 12:14 PM Reply   
Ahh, you are right. I misread. I was thinking of pulling the Tranny along w the V-drive.
Old    Danny (rubin)      Join Date: May 2006       03-04-2010, 12:19 PM Reply   
what year avalanche? we had to have our engine pulled to replace the v drive on our 03 avalanche
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       03-04-2010, 12:23 PM Reply   
I can get to all the bolts on my 03. Shouldn't have to remove the engine. I will let everyone know exact how are the removal is. Worst comes to worse I will pull some of the interior out to remove it.
Old    Danny (rubin)      Join Date: May 2006       03-04-2010, 1:02 PM Reply   
how will you pull it out? our shop seemed to think it wouldnt fit out any openings without pulling the engine
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       03-04-2010, 1:09 PM Reply   
Weird it's actually pretty small. I will let you know if it's not easy. Centurion said it's a breeze. Hopefully nothing goes wrong
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       03-04-2010, 5:27 PM Reply   
Done took around 45 minutes. Worst part was the tight squeeze and also not getting all the oil totally out so my bildge is oily now. Here are some pictures.
Attached Images
  
Old    Danny (rubin)      Join Date: May 2006       03-05-2010, 8:09 AM Reply   
did you pull it out through the opening under the seat?
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       03-05-2010, 9:16 AM Reply   
Yep, it came straight out. You have to rotate the unit 180 degrees and pull the part that attaches to the tranny out first. Then the whole thing just pulled out.
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       03-05-2010, 9:16 AM Reply   
Danny, I would talk to your shop. That sucks that you had to pull the engine! Thinking about installing a dripless shaft seal. Any thoughts?
Old    Danny (rubin)      Join Date: May 2006       03-05-2010, 9:48 AM Reply   
i got charged for 30 hours...maybe it will take you 29 to put back in. haha
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       03-05-2010, 9:49 AM Reply   
Dude that is lame, took me less than an hour. Putting it back in should be faster.
Old    Danny (rubin)      Join Date: May 2006       03-05-2010, 9:57 AM Reply   
do you have the walk through or wrap around seating? the only thing i can think of is the opening under the seat is smaller on the boats with the walk through?

I might have to go have soe words with the shop...they have always come highly recommended on here.
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       03-05-2010, 10:03 AM Reply   
I have a C4, so wrap around seating. Measure your opening. I will do the same.
Old    Danny (rubin)      Join Date: May 2006       03-05-2010, 1:54 PM Reply   
my boats about an hour away so i will have to check next time i see it.

BTW, you will love the 1:146 ratio
Old    Duffy Mahoney (duffymahoney)      Join Date: Sep 2008       03-05-2010, 2:04 PM Reply   
I hope it helps my boat run weight. I am going to get an acme 1579 along with it.
Old    Tommy Boy (twelve02)      Join Date: Aug 2010       08-23-2011, 12:44 PM Reply   
Duffy,

I was talking to Bill Weeks about my boat (Sanger V230) and what prop to run. He mentioned that with the size of my boat and the amount of ballast I"m running, he said that changing the 1:1 gearing to a 1.46:1 would dramatically change the hole shot and performance of the boat.

I saw that you changed your V-Drive to a 1:46 from a 1:1, how do you like it?

I'm really curious to see if this is worth doing.

Thanks,

-Tom

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