6-Speed 4.10s with 37s Need Some Help

[seven30]

Hey thanks!
This is nice: gear calculator http://www.grimmjeeper.com/gears.html

Enter stock data and copy to right side then model different axle and tire on left to compare

With manual 6spd 4.10 (stock tires) at 70mph 4th gear still misses the power band at 2878 rpm but 4.56 axle gives 3281 rpm in 4th right where Id like it to be for passing.

70 in 6th goes from 2072 to 2362 which I expect to have small real impact on mpg especially considering fewer downshifts will be needed.

Now to find a good regearing thread.....

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[Geoarch]

I don't have larger tires or 4.10 gears. My Overland with manual is stock. So I can't help with the specifics you are asking for.

However, having driven many different vehicles with MT in my life, I think it is more just getting the feel for how much torque you have for given speed and acceleration rate. You will learn by doing.

I would agree. The engine (and tach) tell you what's right. My Tacoma shifts at different points than the JTR since the ratios and tire sizes are so different 31s versus 34s.

 

[JD101]

I'd go 5.13 . It's like having 4.88s with a bit of reserve for hills, windy days , towing , or hauling . Your clutch will thank you also .

 

[seven30]

I would agree. The engine (and tach) tell you what's right. My Tacoma shifts at different points than the JTR since the ratios and tire sizes are so different 31s versus 34s.

The real issue is starting off from a stop. The dual-mass clutch makes it real easy to stall.

 

[Geoarch]

The real issue is starting off from a stop. The dual-mass clutch makes it real easy to stall.

Hopefully my 45 years with MTs (first in 1967) and the Tacoma with the same type of clutch will ameliorate any issues.

 

[NachoRuby]

Dual mass seems to more and more be the norm, which is OK with me for a stock/factory part. It doesn't take long to acclimate to.

 

[seven30]

Dual mass seems to more and more be the norm, which is OK with me for a stock/factory part. It doesn't take long to acclimate to.

Its not so much the fact that is dual-mass as the particular design details. There are many many variations on the dual-mass clutch. In our case it seems the primary flywheel is lighter than optimal for truck duty. There is some debate about why that is. My take is that the primary flywheel has low inertia to facilitate longer stop/start system life.

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