The TJ's ran from 97to 05 the top should fit with little or problem
yes
A 1998 Jeep Wrangler does not have EGR.
If the Jeep was originally a soft top, you can put a hard top on it quite easily.
A 1997 Jeep Wrangler uses green coolant.
Trim package
No.
no
Yes
it should fit jeeps from 1997- 2001 97-2006
Will a 304 engine fit in a 1998 TJ jeep wrangler?
yes it will fit1997-2006
No. different bolt pattern.