2nd Hi range in a ZF6

Macktruckdriver

Macktruckdriver

New member
I was woundering how many people have broke pullin 2nd Hi with a zf6 and what kind of power your putting down. I have a fairly built 12V in front of mine with 4.56 gears and it didnt like 1:1 last night so think I want to try 2nd if not Im changin gears.
 
Macktruckdriver said:
I was woundering how many people have broke pullin 2nd Hi with a zf6 and what kind of power your putting down. I have a fairly built 12V in front of mine with 4.56 gears and it didnt like 1:1 last night so think I want to try 2nd if not Im changin gears.
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Honestly stay out of 2nd high. I broke mine with around 700 pulling 2nd high.

My truck likes 5th with 4.56s.:rockwoot:
 
I've seen them break at 480hp and up. We've been welding them up where they break when we put a new one in and it seems to help.
 
JerrodGlover said:
Sounds like I would take that zf out and put in a NV4500.
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Why?

NV4500s don't break to?

If your pulling on the high side your going break it. ZF6, NV5600, NV4500, all are at their best in direct.

Gear your truck so you can pull direct
 
broke my output when I decided to try it once, once. Was probably around 800-900hp then. Have never put it on the high side since and never broke since even at much higher hp levels.
 
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