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Mix and match Main and Aux, Fuller / Spicer

Posted By kblackav8or Sunday, February 19, 2012 5:06 PM
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kblackav8or
 Posted Sunday, February 19, 2012 5:06 PM
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Something I didn't really research was the gear ratio mix of the Fuller TO-905 and the old Brown/Lipe/Spicer aux box I have. 

Aux Spicer/Brown Lipe 8035G

   1          2            3

1.29       1.00       .84

Fuller TO-905C
    1          2           3           4           5
6.11   3.31   1.82   1.00   0.84

I am running 4.11's and 11R24.5's 

I have maybe 20 miles in it so far and of course no load pulling or anything special.  I don't see any obvious glaring issues but more experienced guys can probably spot the holes or limitations if any more easily then me. 
FWIW if you want to see the Fuller Eaton Ratios in spreadsheet format they are here:
http://www.roadranger.com/ecm/groups/public/@pub/@eaton/@roadranger/documents/content/ct_207778.xls

Someday I would like to find a matching Fuller aux box that matches up to my Main. 



Sunday, February 19, 2012 6:19 PM by kblackav8or
Bruce Ohnstad
 Posted Sunday, February 19, 2012 5:28 PM
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Those ratios look about as close as anything I've seen, much less had access too.  With a gas engine they would probably not lug, I don't know about Diesels. 

Dump trucks and lowboys were either loaded or empty, so they jump pretty big and lug.  The truck I'm working on has 100:1 in low and .69 overdrive.

Did you acquire them or were they on the truck when you got it?  What kind of work?

Fuller didn't make many auxiliaries, does anyone have an example?  They're in bookbut I've never seen one.

Bruce


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kblackav8or
 Posted Monday, February 20, 2012 4:10 AM
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I changed the stock Spicer 4 for the Fuller 5 when I swapped in my 400 a few months ago.
Original 4 speed
Main Spicer 8245

1             2             3             4          

5.19       2.88       1.72       1.00      

For comparison I pulled up some Fuller 3 speed aux numbers from the spreadsheet linked in my post.
Fuller 3-TC-92    1       2          3
                      2.64     1.0      .75  

I have no idea if that is a mate to my TO-905 but based on the weight of over 600lbs I presume it is a twin countershaft model.  It seems to have a much wider spacing then the spicer aux currently installed. 

Here is the Fuller/Eaton 3 speed list and ratios cut and paste.

MODEL
3 SPEED
AUXILIARY  
Sales Sht.
TRSL-XXX
Lbs-Ft.
Max TQ.
Over
All
REVERSE HIGH INTER-
MEDIATE
LOW
             
3-A-65 -- -- -- -- 0.75 1.00 2.23
3-B-65 -- -- -- -- 0.80 1.00 1.24
3-C-65 -- -- -- -- 0.75 1.00 1.24
3-D-65 -- -- -- -- 0.80 1.00 2.23
3-E-65 -- -- -- -- 0.80 1.00 1.74
3-F-65 -- -- -- -- 0.75 1.00 1.74
3-G-65 -- -- -- -- 1.00 1.32 2.23
3-H-65 -- -- -- -- 1.00 1.32 1.74
3-J-65 -- -- -- -- 0.86 1.00 1.17
3-K65 -- -- -- -- 0.78 1.00 2.18
3-L-65 -- -- -- -- 0.78 1.00 1.24
3-M-65 -- -- -- -- 0.86 1.00 1.75
3-P-65 -- -- -- -- 1.00 1.32 2.18
3-Q-65 -- -- -- -- 1.00 1.32 1.75
               
3-A-92 -- -- -- -- 0.75 1.00 2.09
3-B-92 -- -- -- -- 0.84 1.00 1.24
3-C-92 -- -- -- -- 0.75 1.00 2.64
3-D-92 -- -- -- -- 0.75 1.00 1.24
3-E-92 -- -- -- -- 0.84 1.00 2.09
3-F-92 -- -- -- -- 0.84 1.00 2.64
3-G-92 -- -- -- -- 1.00 1.33 2.09
3-H-92 -- 4000 -- -- 1.00 1.33 2.64
               
3-TA-92 -- -- -- -- 0.75 1.00 2.09
3-TC-92 -- -- -- -- 0.75 1.00 2.64
3-TD-92 -- -- -- -- 0.75 1.00 1.24












Paws
 Posted Tuesday, February 21, 2012 12:53 PM
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Kevin,

Here is a breakdown of your gear splits compaired to a 8341C, 8035G and a 3TC92 with a TO905C main. I think your current transmission set up isn't too far off and is a much better choice than a 3TC92.

John
 Ratios vs Speed Kevin.pdf (1,734 views, 275.65 KB)
kblackav8or
 Posted Tuesday, February 21, 2012 4:55 PM
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The 3-TD-92 has closer splits more like what I have.  I know where there is a factory mate twin countershaft Fuller OD box that went with a TO-905.  I am hoping to pick it up someday.  I have no idea which one.  Honestly I will most likely never be able to hurt what I have.  If I acquire a big lowboy and a D7 or something then I might get a little nervous but for now what I have should be OK.  After I redid the shift linkage and cleaned it up it does shift significantly better.  Thanks for the little chart. 



Geoff Weeks
 Posted Thursday, February 23, 2012 12:42 PM
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kblackav8or (2/21/2012)
The 3-TD-92 has closer splits more like what I have.  I know where there is a factory mate twin countershaft Fuller OD box that went with a TO-905.  I am hoping to pick it up someday.  I have no idea which one.  Honestly I will most likely never be able to hurt what I have.  If I acquire a big lowboy and a D7 or something then I might get a little nervous but for now what I have should be OK.  After I redid the shift linkage and cleaned it up it does shift significantly better.  Thanks for the little chart. 


 Kevin, I pulled 170K thru a 1100 series Fuller and a 14" organic clutch (rated at 1000 ft/lbs). If you are easy on things you should have no worrys, if you are heavy handed (and footed) you can blow up the heavyest rated driveline.
kblackav8or
 Posted Thursday, April 12, 2012 12:39 PM
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Bringing this back up to the top - So what would the correct auxiliary mate to my TO-905C be? Or would it be best coupled with a Spicer box? I had a recent discussion with someone who doesn't post here who thought it might be best with a 4 speed progressive but didn't get into specific models.


Bruce Ohnstad
 Posted Friday, April 13, 2012 4:59 PM
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From the armchair and just drawing from driving gas dump trucks in soft ground, a low gear is wanted most and low reduction rears. Then to get speed going back empty that tall overdrive is nice. Then lug in between. We never had more than a couple miles of straight, paved road and compromised between winding in upper mid rpms or lugging.

So depending on your rear ratios, you'll have two fairly close overdrives at higher speeds. .84 would be a couple hundred rpm, I think. 3rd to 4th to 5th on the main might lug some, usually frustrating on our 5 and 3 dumps. If you get a D 7, you'll just need to get a second truck!


I forgot to mention that the 1.29 under would be a nice close ratio. So maybe your current 5 and 3 setup could be used to split the pesky big jumps between 3, 4, and 5 if you are on highway stretches. Only my dad's 5 and 4 auxiliary had a close, practical split, the 3 speed trucks we didn't bother much moving under-direct. The road conditions would change quick anyway.


Bruce


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Friday, April 13, 2012 5:10 PM by Bruce Ohnstad
robert porterfield
 Posted Friday, April 13, 2012 5:23 PM
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to905 and an 8341g or an r8341g works out real good
kblackav8or
 Posted Wednesday, April 18, 2012 4:47 AM
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Thanks - someday one may come along and I might upgrade to it. That or a 1241 or if I ever figure out and find a matching Fuller.



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