Atlas or 271?

Diesel Freak

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Jun 20, 2007
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Took a trip up the street to check out Advance Adapters today. Nice little factory they have there!!!!

Anyway, gotto see the internals of the Atlas Transfercase. Nice unit!!!

But I wonder...how many people use this box when pulling?

The 271 is physicaly bigger than the Atlas, but bigger does not always mean better.

I can see the 271 being better suited to drag racing, but with ratio options of 3.0, and 3.8 on the Atlas, I would not have to re-gear the truck and still be able to run 5th low range pulling. It also has a yoke on the tail shaft and not a slip joint.

With what I was able to gather while talking with them, the output shaft "could" be good for over 7000 foot pounds. The 5500 foot pound limit on the 241 was on the planetary, NOT the case or the chain...whish as we know can not handle 5500 foot pounds.

so, where does the 271 sit?
 
Be nice for a street truck, but that much torque will be hard on driveline parts.
 
Personally Id go w/ the Lowmax
atlasintcompare.jpg

http://www.jbconversions.com/pages/products/lomax205/completetcase.html or Stak both are beefier
http://www.stak4x4.com/home.html
 
Is that classified as an OEM case available in a 1 ton or smaller?
 
The Lowmax kit is for the NP205, which was available in every 3/4 and 1 ton truck for years
 
ive seen rock crawlers bust the atlas fairly easily......i think most trucks that need the case actually make too much power for it........i would do a 205 full of aftermarket parts.......
 
I have heard a rumor of a 271 out of a F550 with a true U joint yoke on it...is this true?
 
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