What would the major difference be between the 2?

And I was recommended this tuner, what do yall think?
http://www.sctflash.com/products.php?PID=2&VID=451

 

and 4.56's with 35's

 

Well I found a sct sf3 3015 tuner on Craigslist that is unmarried for 225. It says it has the pre set tunes and can hold up to 3 custom tunes. Do y'all think that's a good deal? And If I get it should i get it custom tuned?

Also I had a shop tell me that if I want to regear, with 35's I should get 4.10's over 4.56's. what do y'all think?

 

With a 5.4, you could get away with 4.10's with 35's but not with 37's. With 2wd you can get 4.30's which would be a decent compromise for both tire sizes.

 

I think this is great deal:
http://www.morepowertuning.com/1998f15054sf3

Price is even less with the forum discount. Mike is great to deal with.

 

How do his tunes hold up in comparison to Troyer, 5 star and all those other ones I've been hearin about!

 

Running a new 91 perf/tow from MPT :-) Pretty nice. Just did 200 mile trip. I will be starting a thread shortly once I get some miles to give a decent/fair write up!