Brother, if in reference to Islamabad Excise (since you have not mentioned the city / province), then your 3400 cc Jeep falls in FOUR WHEELER VEHICLES, Private / Government, From 2501 and Above, and the TOKEN TAX is 12,000 PKR Annually.
Similarly, for Private, From 2000 and Above, the INCOME TAX (w.e.f : 01-07-2019) is 10,000 PKR (for Filer), and 20,000 PKR (for Non-Filer).
I believe, only these two taxes are mostly charged annually, and similarly, you can check for other provinces, or your province too.
Nope Borther. Different tax slabs are there against different engine cc categories. You need to check that in which category, your 3400cc Jeep falls?
All is not up to 1000 cc only.
And other member has rightly pointed out how to check details. You may check as per his instructions.
I hope, all above guides and helps. Thank you.