So I have been looking at an increase in mileage, and this is the biggest bang for your buck if it works. Does anyone out there have the RPM drop from your stok od to the 2x od. How much beter does the truck tow? Does it shift automatically between the split? Satisfied?

 

I had one in my old truck. dropped the rpm about 6-800 i think.

 

wow, so at 60 mph the truck would turn about 1400?

 

BTW the best increase in MPG is Veggie conversion.
I get 130 MPG atleast.

 

for what it's worth. I took it out of my old truck before selling it. It's basically a core at this point. Saving up to put it behind my 5 speed. It will help the life of you're tranny if you do a lot of towing. you will probably have 6 forward sppeeds 1st, 2nd, 2nd over, 3rd, 3rd od and 3rd double over. I dunno how much they get for one new though.

 

Todd-I didn't get that low in rpm mine was a c-6 trans with no OD and a 4:10 rear so if your setup has you cruising at 60 at about 2200, it will drop down below 2 grand anyway how much I dont know. The nice thing is you can choose which gearbox you want to shift up or down, just push the button like for hills and passing Have you been to their website? They've got a lot more info than me -I'm just going from memory I hope to put mine in and get 9 speeds! I wish there was a way to clutch the transfer case-that would make it 18! LOL

 

where can i find this at?

 

There was one on an Excursion when I bought it, took it off and put it on my 88 F350 7.3. On the Ex I could run 1500 rpm or so running 70 mph.

 

The real questions.
At the cost of around 3 grand, how long do you think you have to drive to get yours moneys worth?

 

Todd, yes I have one. When I'm in 5th gear running 70 I tach 2500 rpms. Turn the gear unit on and it drops to 1900rpm. I love it. I've been driving this new truck around and it really sucks not having the GV in it yet.

 

Duck,
So can you use it say at 60 mph? Is there a cutoff point in it predetermined? The way I am looking at it is at 60 mph, I would be getting better MPG then a 373 rear end. Mine stock in my 3/4 ton turns 15 t0 1550 rpm at 60, and about 1950 at 70. So this would transform my dully into a ricer almost?? It would have to bump fuel mileage by quite a bit. I would guess to 22 or 23 on the highway? Is that what you were getting on a longer trips?

 

Yes, you can definatly use it at 60. You can't really run them below about 30mph because they engage by hydrolics driven by the drive shaft speed. At 60 with a 3.73 rear end, your rpms will probably be about 11-1200. I have 4.10's in mine and it works out perfect. On long trips, I tend to push the truck. So I generally see about 18-19. If I wouldn't drive like a jackass, probably 20.

 

let me know for sure what your turning at 60 in your 2nd od with your 410s. Would appreciate it.