Im sure this topic has been beat to death but here goes. I have a 92 with the 4.0 and auto trans, it had the plugs and plug wires replaced along with a new air filter. I would like to put some 31s on it but im afraid the motor will be to weak to turn them. What is the first thing i can do to it? im thinking a throttle body spacer and a cold air intake, any ideals?

 

you have plenty of power to turn those wheels.its not a civic

 

Throttle body spacers are a waste on $$$.
Do a injector upgrade.
https://www.cherokeeforum.com/f51/in...ap-4-0l-92149/

And x2 with dajeep. It will spin 31's no problem.

 

When I put my 31's on, did not notice any difference in power issues. All on stock motor.

 

I just put my 31's on and can notice a difference. I am going to try to build a cold air out of a filter an piping from autozone and build a box out of spare sheet metal