4:88 gears for a 2016 on the way.

How much worse now? Small difference or really noticeable? I can live with it now, even though I don't like using cruise control with it. May be a little worse would be ok, but not much. I know it's hard to quantify..........

 

It's not much worse.

 

In for updates as well. In the middle of a 3000 miles road trip and good lord it needs something. The 275/70/17, bumper and armor might be an issue too but I've never owned a truck that got worse highway mileage than city.

 

yeah with armor, wheels, and tires its very sluggish. cant wait to get my rears in.

 

Sorry if I am missing something but do you expect a regear to 4.88 will improve mpg?

 

From those that have done it, they reported about a 2-3 mpg gain back after after markets.

 

Nitro gears reports 3-6 mpg depending on what tire size you went with!

 

Take this with a grain of salt as it was on a 2013 Jeep JK, but I ran 4.56 gearing with 37s. I did not see an increase in MPG however the Jeep drove like it should. I might temper my expectations of better MPG as that will depend more on your right foot.

With that said, I plan to re-gear the Taco to 4.88 and run 285s. So weird that such deep gearing is needed with a 33" tire, but from what Nitro told me they are perfect.

 

Well.... It's better... Actually way better. But after driving a combo of our Tundra and 2015 4 runner the last week, I'm a little convinced that nothing short of a V8 swap will make me love this power train. BUT I'm going to curb my negative nancy-ness and wait till after Mondays trip to Sedona and off road trip planned. That should give me a good indication of where they are at.

Driving at 70mph on the freeway I believe I was around 2000RPMs which seems a little low. I need to do some further test on the open road to confirm exact numbers.

On the bright side I do love the re-work of the rack we just did and all the "over landing" goodies we added to it. I still love the truck as a whole, it's just the power plant that makes me feel like I'm in a time warp driving a 1990 3.0 slow.

 

For those that have done the regearing, what's the process for recalibrating the speedo?

 

Great info.

 

then why is everyone suggesting 4.88 for 33s?

 

Too high of geared to begin with to have moar power and raise the torque curve.

 

I don't know, that's what I'm running now and I'm not liking it. Yes the torque is nice but it's harder to stop with an auto because there is so much torque. That and the engine rpms suck

 

I'm curious what that would also do to the low range.

 

That's accurate on a 4 liter truck, but I wouldn't feel it's applicable on out 3.5. The range in which they make power is completely different and the same gearing suggestions wouldn't necessarily overlap on the two.

 

It's amazing for crawling up hill, not so much for downhill. Pop it back and forth between neutral and drive

 

Ya I was thinking more for down hill

 

With 285's you will lose 8% gearing plus the added weight at a larger diameter really compounds the inertia you have to overcome.

Compared to stock 3.9 gears:
4.30 ~10%
4.56 ~ 17%
4.88 ~ 25%.

 

what is the break in procedure your shop has you doing? the shop i took my truck to has some crazy strict break in period.