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Car won't rev over 3000rpm in any gear

Jimbo01

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VT excutive
Have just replaced my auto trans in my VT v6 and after doing so it won't rev over 3000rpm not even in neutral, sort of just crawls in drive doing max about 20 khm. Almost seems like it limi bashes at 3k as it drop back down to 2 and then just only gets to 3... Have made sure everything is connected and don't have any fault codes chucking up on my computer... Am Abit stumped, any help would be much appreciated
Cheers
 

mechanic

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not even in neutral
This indicates to me that it's not transmission related.
Start with the basics - fuel and spark.

Did you squash a fuel line when you were installing the new trans? Are any of the rubber hoses kinked?
Is the exhaust blocked?

What are the O2 sensors telling you during the symptom? are they rich/lean?

Check over all of your work and check for pinched/broken wires.
 

Jimbo01

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Cheers mate have had a good check over everything can't see any crimped or kinked lines or wires but I did happen to notice two spark plugs cracked and another twoapperead to look like it was sorta of cracking... Other two were fine. Thinking this could be my problem just need to get ahold of some plugs, cheers mate your information is much appreciated :)
 
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_R_J_K_

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Sounds like it's in limp home mode. Is it throwing any codes?
 

Jimbo01

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Nah mate no codes are coming up... Have wondered if it's in limp mode but then it should have codes come up shouldn't it?
 
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