Flipped Divorced TCase for gear splitter

[IronBenderII]

Hey guys. I know this has been discussed but I can't search so I can't find it... I did find a topic in gen 4x4 w/ a Yahoo search but this isn't a 4x4 question and I don't want to BTT it in the wrong section.

Anway, I have a motorhome that I use as a tow rig sometimes (like in May when I got to Moab). It has a C6 which is a great tranny but the mileage kills me on the highways.

I'd like to do a gear splitter but the Gearvendors unit is just too much $$.

So has anybody taken say a divorced 205, flipped it and used it as a splitter?

-Can you shift on the fly?
-How'd it hold up?
-Oiling issues or anything?

Thanks all for your help!

Jack

[Flexy Flatty]

I dont see it on their website, but I think that www.exaxt.ca makes something like this out of an np203 to drop rpm's when running their unimog axles. I don't think its divorced though. Would be worth a call. If I'm not mistaken, they had to use a different type of bearing or something that could cope with the different loading.

[wheelin66bronco]

Look Jack, you got a reply:flipoff2:
Do you really have enough power to over drive it?
" (like in May when I go to Moab). " Does this mean you are really coming down this year?

[thecarman]

I've thought about this too, but I abandoned the idea for two reasons:

1) The NP205 and NP203 don't shift well "on the fly" between High and Low.
2) The low gear ratio when run backwards will be a 0.5:1 overdrive (since it is 2:1 when run in the normal direction). This is too much for gear splitting.

Like if your stock C6 first gear ratio is approx 2.5:1, then when you shift the T-case into Low, your effective ratio is 1.25 (0.5x2.5) - this is now above your stock second gear ratio, which I'm guessing is around 1.5:1. You would instead want your split ratio to be between your stock 2.5:1 and 1.5:1 ratios.

Similarly, when you are in 2nd gear and want to upshift to your split gear, the low range will give you (0.5x1.5) 0.75:1, which again is above your next gear (1:1) instead of below it.

Does that make sense?

[demonranger]

1) The NP205 and NP203 don't shift well "on the fly" between High and Low.
2) The low gear ratio when run backwards will be a 0.5:1 overdrive (since it is 2:1 when run in the normal direction). This is too much for gear splitting.


what he said

You could put one on and regear the rear to give you the better cruising speed and then throw it in LR for slow moving and city driving but then you're caught having to stop to shift out of LR.

for a less expensive and IMHO more durable option look into a US gear OD they are still expensive but less than a GV.

[IronBenderII]

Yup, planning on doing Moab. I'm trying to hit the 40th the weekend before to run the hammers but I don't know if I'll be able to pull that off.

Thanks for the info guys. I have a diesel Suburban that needs OD badly as well so I was hoping to go a low buck route so I could do it on both.

Anybody have any experiece with the old 2 speed rear ends? I don't even know if I could find one in the junkyard but maybe that would work in the RV at least?

Jack