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Old 08-11-2016, 09:06 AM   #1
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Lightbulb Thinking of changing Rear end gear ratios

I am thinking of changing my rear gear ratio. I have a DT360 with an AT545. Has anyone here changed their ratio? What was the outcome? How much were the parts? I would like to drop my RPM’s down a little. I would love to run 60 at 2500 RPM’s in fourth.
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Old 08-11-2016, 02:45 PM   #2
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I have yet to change the gearing in my bus, but having checked into it, I can get it done for about $800 or so; this is with me pulling and reinstalling the axle module. The module will be refurbished, new bearings, seal, etc.
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Old 08-11-2016, 03:31 PM   #3
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Quote:
Originally Posted by Brad_SwiftFur View Post
I have yet to change the gearing in my bus, but having checked into it, I can get it done for about $800 or so; this is with me pulling and reinstalling the axle module. The module will be refurbished, new bearings, seal, etc.
Its a good upgrade for the money, if you ask me.
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Old 08-11-2016, 04:15 PM   #4
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Well that sounds good. I will be looking at around $400 to do it on my own. Not bad.

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Old 08-11-2016, 05:16 PM   #5
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Originally Posted by Ryannmelis View Post
Well that sounds good. I will be looking at around $400 to do it on my own. Not bad.
If you are skilled and knowledgeable on how to remove, reinstall, and properly adjust the ring & pinion then that's not bad. However, since I am not, then spending the extra to have the gearset professionally installed & adjusted makes sense to me - plus they give a warranty.

Or is that for a used module from a boneyard?
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Old 08-11-2016, 05:22 PM   #6
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Speaking of gear swaps, anyone have a suggestion as to what gear ratio I should consider? Running gear as follows:

IH 9 liter engine
Allison trans (I am thinking it's a 545)
Hydraulic brakes

Current gearing 5.38:1, top end around 50-55, would like a top end around 70 but not if it will overwhelm the engine. Thinking maybe around a 4:10 ratio?
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Old 08-11-2016, 05:41 PM   #7
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We started with 6.14 and changed it out for 4.7 in our DT350 with AT545. Original speed at 2700rpm was 47mph, 52 downhill. With the other gears our new average is about 59 and we've gotten to 70 once downhill but it was scary and about 3200rpm before we noticed. I bought the 4.7 hog head from Kubla on here. He was switching his out for 4.1. I paid him $350 and did the install myself. Not hard at all if you have the whole thing. Eventually I'd like to get 4.1 and switch the tranny too.
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Old 08-11-2016, 05:54 PM   #8
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70+ in a bus won't bother me, as I am accustomed to driving large vehicles, and I worked for a hatchery some time ago. They ran purpose-built buses (mostly extra headroom, windows with panels instead of glass, and lots of ventilation) to haul freshly hatched chicks, and they were geared for 70+.
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Old 08-11-2016, 05:58 PM   #9
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I have an 8.2 with 545 and 6.5 gears.
I want to do a gear change real bad but my rear end from what I can find has been out of production for awhile and I can't find gears for it.
Everything suggested to get me to 55-65 range was in the 5 and high fours before I started burning up the 545.
But you also lose any hill climbing power or so I am told.
Another option I have is going to taller tires which are supposed to help but once again I am not finding my Dayton split ring not rim. Currently I have 9r20 tubed rims and when I can find them I can go to 10r22.5 tires which should pick up some speed but the bus will bounce/dance around more because of the taller tires.
I wanted a garage to do mine because of warranty but the cheapest I have found is 3000$ if I buy the gears and bring them the hog head??
If I have to do all of that in a gravel driveway and all of the neighbors kids running around daily (6-10) I can change the gears myself. I just wanted the warranty from a shop so I didn't have to worry about setting the spacing,lashing,backlash and I am on the side of the road somewhere 6-months later cause I mucked up.
Brad swift fur
I don't know your engine but I have the same tranny I think?
Is yours a 4-speed if so its the 545 without the lock up torque converter.
Everything I have heard was to leave the motor at its factory settings for longevity.
The 545 has specific temp and speed ratings or your gonna be looking for a tranny next?
With the gears you stated for yours I think your weak point is the tranny not the rear gears.
But that's just my opinion and some research knowledge from my lead sled (49-mph) build
I am just trying to get to 55-60 and your already there.
Wish you luck making 70 maybe we can wave at each other when your passing me.
Good luck
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Old 08-11-2016, 06:13 PM   #10
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My suggestion would be to leave the rear end alone and change out
the transmission to a 5 or 6 speed model like the Allison 2060 or md3060
which are 6 speed transmissions which are double overdrive which will
give you the lock up converter for mileage and a the low gear starting
power. My bus has an MD3060 but only has 5 speeds open with 6th gear
locked out at present. With 12r22.5 tires it is doing 65mph at 2000rpm.
my differential ratio is 5.38, top speed at 2400 rpm is 85mph.
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