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Tractor Transporting

Re: 3.73 or 4.10

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PretendFarmer

03-01-2014 06:06:15
70.188.162.137



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The question of which rear end ratio to get, is not a one all application.

While a V8 powerstroke and a V8 Dmax may shine with 4.11's or higher, a cummins, especially a 12 valve such as mine does not.

I can say that a Cummins gets its power at the lower RPM area. While the V8's may like to rev more, a straight 6 diesel is best operated at lower rpms, at least I think so.

3.55's work well in my truck. With the NV4500, I have a decently low 1st and have no problem getting my trailer going.

If I were towing 20,000+ I would probably want 4.11's though but for my trailer loads of 17,000 or less 3.55's work well with this Cummins.

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T in NE

03-05-2014 01:37:52
75.238.184.146



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 Re: 3.73 or 4.10 in reply to PretendFarmer, 03-01-2014 06:06:15  
Your 12-valve doesn't shine with the 4.10's because they only governed them to 2500. Put the proper governor spring(s) in for 3200 RPM redline and you'll make a whole different truck out of it.

For whatever reason they put an ag cam in the Cummins, it torque peaks about the same RPM as the Powerjoke and Dirtymax, but with a cam from Colt or Hamilton can get down to about a 1400 RPM torque peak.

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PretendFarmer

03-05-2014 04:59:18
192.249.47.207



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 Re: 3.73 or 4.10 in reply to T in NE, 03-05-2014 01:37:52  
I fix or modify to suit my needs. And so far, the mainly stock Cummins 12 valve pulls alot of weight, just fine for me.

Tuned up pump, 30psi boost.



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David G

03-01-2014 17:20:34
205.215.206.18



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 Re: 3.73 or 4.10 in reply to PretendFarmer, 03-01-2014 06:06:15  
Pretend, you got any facts to back up those claims?

Very hard to find 4.11 in any Diesels now, they produce so much more torque than the earlier ones.



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FC Andy

03-01-2014 09:51:09
192.183.38.30



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 Re: 3.73 or 4.10 in reply to PretendFarmer, 03-01-2014 06:06:15  
My new Tow rig, an '08 F-350 with 6.4 powerstroke and a 6 spd. stick has a 3.73 gear. Stock setting on the ponies, too. I think you got to go to a 450 to get 4.10s? Anyway, I like to run about 60-65 if I'm on the interstate, And I don't like pulling loads in overdrive, so in direct (4th or 5th, depending on if you count low hole or not), I towed 12,000 and had plenty of power left all the way through the mountains on I75 from Knoxville to Toledo. Heck, I'd throw the 806 on the deck and be sitting with around 16,000 behind me and do it again without thinking twice... Can't say that about the old 6.5 chevy. :-) -Andy

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soundguy

03-01-2014 18:07:45
207.30.46.70



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 Re: 3.73 or 4.10 in reply to FC Andy, 03-01-2014 09:51:09  
wonder if the SRW / DRW makes a difference.

my axle code chart is dated.. since my trucks are old ( 99 etc.. )



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