Definitive 200-series Gearing Reference (1 Viewer)

[MTKID]

Need that 4:1 low range combined with a 10% underdrive high range t-case upgrade. When will that drop!?

That would yield a result similar to 5.29s on the street and the obvious low range off-road gearing benefit as well.

If anyone knows of any progress with that, I’d love to hear about it. Or a way to do an additional transfer case.

 

[grinchy]

will the 6speed transmission lockup at freeway speeds?
Conditions
60 deg
Flattish
6th gear
63 mph
D mode
4.88 ratio
35x10.5r17 (34.5” book) roughly 95 lb a corner

Lockup? Yes

I also posted a pic of an unlocked (no green light in center) to show the dashboard isn’t broken.

Stayed locked up a medium hill, so it looks to be good

 

[TeCKis300]

will the 6speed transmission lockup at freeway speeds?
Conditions
60 deg
Flattish
6th gear
63 mph
D mode
4.88 ratio
35x10.5r17 (34.5” book) roughly 95 lb a corner

Lockup? Yes

I also posted a pic of an unlocked (no green light in center) to show the dashboard isn’t broken.

Stayed locked up a medium hill, so it looks to be good

View attachment 2993017

View attachment 2993019

Data...good stuff!

I think we know that it will lockup in 6th. The question was would it lockup in 4th and 5th, with 4.88s, and when towing? I think we got an answer of yes in another thread, but it seems there might be some impact to the degree it will readily lockup?

 

[linuxgod]

Data...good stuff!

I think we know that it will lockup in 6th. The question was would it lockup in 4th and 5th, with 4.88s, and when towing? I think we got an answer of yes in another thread, but it seems there might be some impact to the degree it will readily lockup?

Yes I can confirm it will lock in 4th and 5th when towing. It’ll lock in 6th too but you pretty much need to be going slightly downhill to keep it locked. 5th is tricky - it’ll lock up on flatter lands up to 75mph when towing but on hills or even into a bit of wind it does unlock, whereas in 4th it pretty much stays locked except very steep grades.

 

[TeCKis300]

^Good to know!

 

[linuxgod]

^Good to know!

In fairness I'll add, speeds and weight matter as much as terrain does. Staying locked in 5th at 60mph is easier than at 75. And I'm pulling 6000# but if someone had a small turtleback they could probably stay locked in 5th (or maybe even 6th) much of the time.

For me I can run in 5th around Illinois without issue, but depending on the wind and terrain (especially the hills on I-80 in western Iowa) I found I would have to pay attention and switch between 4th and 5th. Again though I'm pulling 3 tons and I drive 75 on those 75-80mph speed limit highways, so each person will likely have a slightly different experience. Tire size probably matters a bit too... I'm on 34s but going up or down will obviously have an impact on the ratios where the rubber literally meets the road.

On our 7700 mile road trip last summer I did manage 8.8 MPG. Of course only maybe 5300 miles was towing. I think I managed maybe 0.5mpg higher after re-gearing, so long as I worked 5th gear whenever it was feasible to keep the TC locked, vs running consistently no higher than 4th with stock 3.90s. So the gearing can help MPG slightly, but you'll never get your money back... and while my around town MPG is improved now (unladen) my highway mileage suffers a bit. BTW my transmission temps do run 15-20F hotter now though consistently...

 

[clrussell]

Thank you for this info. Great tech to have.

 

[DesmoPilot]

will the 6speed transmission lockup at freeway speeds?
Conditions
60 deg
Flattish
6th gear
63 mph
D mode
4.88 ratio
35x10.5r17 (34.5” book) roughly 95 lb a corner

Lockup? Yes

I also posted a pic of an unlocked (no green light in center) to show the dashboard isn’t broken.

Stayed locked up a medium hill, so it looks to be good

View attachment 2993017

View attachment 2993019

May I ask what app/system this is for monitoring the vitals?

 

[linuxgod]

May I ask what app/system this is for monitoring the vitals?

OBD Fusion