Blackbear tune

HaulinBass02 wrote:
Calsdad

I'm leaning towards 4.56 in mine solely because I run 33s and will ALWAYS run 33s. If you are on stock height tires and don't plan on going any bigger, then 4.10s would be your best bet.
If you look back on the other site between myself and AKCooper9, I'm using his experience as my baseline. I did the math using a gear calculator and with my tires and 4.10 in 5th gear it puts me at about where he was with his slightly older truck with 4.56 and 4th gear.
If I go to 4.56 I can then tow in 6th, but I'm not completely sold on that yet. I think it is just too steep of a gear to tow in.
I really won't know what I do with it yet until we actually buy the TT we are looking at and I've towed some trips with it to see how it tows. I DO know that a gear change WILL happen, just not sure which ratio to go with yet. I might even do the cam swap and finalize the engine mods to see what kind of power I get to try and determine what gear to go to as well......

I spent a bunch of time going thru all the tire size options because what I really want is to have the ability to add larger brakes to the truck. From all the kits I have seen - that means going with 20" rims. Which is another issue because after doing some measuring - I found that there is precious little room available in the front wheelwell for larger sized tires.

What I think I've finally decided on is that I'll go with a 20" rim - with LT285/55R20 tires. This size tire is 32.4" in diameter according to Tire Rack (vs the OEM tires which are 265/ 70R 17 which are 31.7" diameter)

That means I have around 1" larger tire - which by my measurements should just clear the front wheel well when turning. I did find some info on modifying the front wheelwell which looks like it might gain up to another inch or so of clearance. So I think I'm safe with that size tire.

I'll check out what AKCooper has done. My reasoning for going with the larger tires is simply to put in larger brakes. My reasoning for going with 4.10 is because it apparently ups the tow rating to 13k. Going to the slightly larger diameter tires may mean I need to go to a different ratio than 4.10. For the 10.5" axles it seems like the only next jump there is - is to go to 4.56.