Just installed 4.88 gears and lockers and 33's but highway driving sucks

Wondering what the cheapest and easiest way to get lower rpms on highway. Now at 70 mph I'm running around 3100 rpm. Seems like it needs a 7 th gear in Trans. Would going bigger tires help. I think I should have went with 4.56 gears.

 

https://www.motortrend.com/how-to/1211or-why-change-gear-ratios/

I don’t see larger tires helping you on the highway. More weight and rotational mass to accelerate.

 

What would u suggest

 

If you are going to do a lot of highway driving, 4.56 would help. Or just accept driving slower in the right lane.

If you are doing some hardcore wheeling, the 4.88s might be worth the trade off.

What does a normal month of driving look like for you? (% city driving, highway, off-road)

 

More city and off road then highway

 

What vehicle? Is it shifting into high gear? Is it the 07 shown in your profile? Auto or manual. Per the Motor Trend articles formula your RPM should be about 2500 in 5th gear for a Auto trans. 5th gear is .716-1. (70mph x 4.88 x 336 divided by 33= 3478.1090909091 x .716 (5th gear)= 2490.326109 rpm

 

You need bigger tires.

 

Just gonna throw this out there ... how exactly are your measuring the 70mph ? Is it accurate

the reason I ask is that 3100@70 can’t be achieved in either 4th or 5th/overdrive with true 4.88s and true 33s

 

Go 35s &

 

It's an 07 tacoma 6 speed manual

 

I have hypertech speedo calb and checked on GPS it's 70 miles. At 70 in 6th gear it's just at 3000rpm then at 75 mph it's 3200rpm. It's 4.88 gears from east coast gear and it's 285/70/17

 

I was thinking bigger tires because in that aspect they ask when u buy gears which tire size do u plan on running

 

You need bigger tires for those gears. You over geared it. Pretty simple. 35s look legit AF anyways.


Edit: I’m pretty sure a gen 3 tranny is a direct bolt and it has a taller top gear. Personally, I too would like a gen 3 tranny.

https://www.tacomaworld.com/threads/6-speed-shenanigans-ra60f-swap-to-rc62f.701237/

https://www.tacomaworld.com/threads/tacoma-6-speed-solution.

 

In the grand scheme of things that rpm is safe and as long as engine is in good working order you will have zero problems. 300rpms lower isnt going to make any difference other than maybe peace of mind.

 

-5Db?

 

Exactly.

 

I already bought my fj cruiser transfer case for my twin stick swap, it's next on project list. Can I put taller gears in my Trans when I pull it out to replace clutch. I really don't want to get 3rd gen Trans just more work and money to fit. Would bigger tires fix this issue? I just bought them last week

 

Yeah you overgeared for 33’s

 

Putting new gears in would be an extremely custom thing. Definitely not an off the shelf solution. The gen 3 Tranny also has a stainless quill…

 

Add some armor too. Remember you’re just preparing for Moab in the future