4.88 and Eaton True trac installed... Underwhelmed

I'm running the 255/80/17 toyo at3 e loads which are about 50lbs according to their website. Been happy with acceleration and up in the mountains too.

 

late to the party but a tune would be the way to go. You can always swap back as needed. Depends on what you were expecting. The truck will feel a bit smoother and quicker than stock it's not going to give you race car feelings. I had 4.56 and a tune, and I thought it was the best combo I have had even with FI (although the truck got a lot heavier). If you are running E-rated, you can go to C rated or go to a skinnier tire, and that will pay dividends. Just read @crashnburn80 response and just that. N/A tune and 4.56 for me was spot on but could have gone 4.1 or 4.3. The current setup wold feel grate on rocks. Now I am 4.56 with FI and its a nice combo. I may go 4.88's on my next change if it comes to it but that is more considering larger tires etc.

 

That makes sense, I was considering going with a bigger tire is the main reason I didn't do lower than 4.88.

 

depends which tire. I held off on 4.88 as I was unsure when. Even with 35's 4.56 has been nice. If you are going to 35's are larger should balance out in time.

 

500 miles down, I have been a little more pedal heavy since hitting 500. Eaton is pretty nice, I guess my stock LSD was shot. The acceleration is nice now that I'm getting on it, but I think a bigger tire will smooth this out a lot.

 

I wonder if 4.56 vs 4.88 on 35’s makes a difference regarding auto vs 6MT

 

It does. Personally have not ran both but the 5 speed is going to be geared differently.

Rule of thumb I got from a lot of folks when I was reading
4.56 (Manual), and 4.88 (Auto) would be similar.

I am running 4.56 now with 35's, and it's been fine (I am also S/C, though).

Most of the calculators with gear ratio will say 4.88's too much some low-end "power". A lot of folks I know run 4.3 and 4.56 but you will see plenty running 4.88s on either setup. 4.56 has been a nice blend of back-to-stock ratio with a tad more to it than stock.

 

On a 33" tire, truck is really nice. Love being able to chirp tires with my gas pedal. I don't regret the gears. Just wanted more initially!

 

All together need to take our smog tea and pour it into the bay.

 

You did 488 with eaton truetrac? I'll be doing this soon

 

Yea, its great! Gas milage is gone, but that was expected.