2 Speed Rear End - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 16 (permalink) Old 05-18-2009, 01:21 AM Thread Starter
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2 Speed Rear End

hey guys, lookin for a 2 speed rear end for my 99 cummins 3500, have you ever heard of such a swap?? i do mostyly hwy driving now and these 4:10s are killin my wallet!
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post #2 of 16 (permalink) Old 05-18-2009, 02:52 AM
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Originally Posted by 99' Dually View Post
hey guys, lookin for a 2 speed rear end for my 99 cummins 3500, have you ever heard of such a swap?? i do mostyly hwy driving now and these 4:10s are killin my wallet!
Not a great solution going with a whole new rear end. You could do a gear vendors o/d that'd pretty much be the same thing as a 2 speed rear.

"some people do, some people talk."
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post #3 of 16 (permalink) Old 05-18-2009, 08:31 PM
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I gear vendors would be a great choice, a lot less involved, and maybe even cheaper than a full 2 speed rear. A new drive shaft would be in order I believe

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post #4 of 16 (permalink) Old 05-18-2009, 08:35 PM
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Originally Posted by HighTQCummins View Post
I gear vendors would be a great choice, a lot less involved, and maybe even cheaper than a full 2 speed rear. A new drive shaft would be in order I believe
The GV setup usually comes with the shorter driveshaft per application in their pricing.

I had one in my old truck, I thoroughly enjoyed having/using it (truck was equipped with it from previous owner when dad bought it).

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post #5 of 16 (permalink) Old 05-18-2009, 08:40 PM
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Wow i didn't know they sent one along with it, I thought it was just the unit. Learn something everyday

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post #6 of 16 (permalink) Old 05-18-2009, 09:26 PM
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Wow i didn't know they sent one along with it, I thought it was just the unit. Learn something everyday
I could be wrong, though it makes sense. Or they at least offer them in addition to the product- Why bother making the customer have to go into a driveline shop and waste that time/money elsewhere when they can get you done in a package deal?

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post #7 of 16 (permalink) Old 05-18-2009, 09:56 PM
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Wouldn't it just be cheaper to do different gears, like 3.73's. I know those Gear Vendors aren't cheap at all.

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post #8 of 16 (permalink) Old 05-18-2009, 10:09 PM
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Wouldn't it just be cheaper to do different gears, like 3.73's. I know those Gear Vendors aren't cheap at all.
Different gears in both diffs would still cost ~1/2 what a new GV unit would cost. IIRC last I checked a new GV unit was around $3-4k. Buddy just spent ~$1k for a rearend rebuild (granted it was a rebuild vs re-gear, and he got a new locker)...

At this point, I would look into all the options: re-gear, GV unit, 2 spd rear, and whatever else can be thought of. Compare the prices, function, etc. of each to the others, then decide what may be best for your use, and your wallet.

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post #9 of 16 (permalink) Old 05-19-2009, 12:54 AM
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He may keep the 4.10's just to get it movin off the line, esp. if he's been towing heavy. Thats where the GV (from what I understand) shines. Once u get it moving you can flip it into the OD (activate the GV box) and drop the revs a few.

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post #10 of 16 (permalink) Old 05-20-2009, 12:41 PM
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I am planning to do the GV some day but my budget keeps pushing it out. I can't remember from
when I last looked into it if you get a drive-shaft but I think you get a 30% decrease in RPM and
a 20-24 % increase in fuel mileage. I don't know anything about the two speed rear-end: who makes
them, how much are they, and what do you guys think of them?
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