I ran 33's with stock 4.10's with my 4 cyl. I imagine you would be fine with the 3.slow As for how long they last...its very hard to tell. Some ppl have good luck with them and some have terrible. Take Blackdog for example, he is on his 3rd 3.0 Then some ppl have a 3.0 that thinks its a 22re and it just wont die. If you were real serious bout buying this I would do a compression test on the engine and see how its doing.
