C6 Vs E4od
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Senior User
Joined: Jan 2007
Posts: 167
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Originally Posted by Dave Sponaugle
The US Gear unit works in overdrive while the truck is in 4 wheel drive.
The Gear Vendors does not, it only works while in two wheel drive.
The US Gear is a huge unit, it also allows spliting gears.
The Gear Vendors unit is small, replaces the tranny tailshaft or the transfer case rear housing and allows splitting gears.
By splitting gears I mean 1st, 1st over, 2nd, 2nd over, 3rd, 3rd over, 4th, 4th over with a four speed. Same thing with a C6, but third over is your top gear.
Both require rear driveshafts be shortened, but the US Gear also requires making the front shafts longer.
The US Gear also needs to have the front fuel tank shortened, the floor pans bent upward, transfer case linkage mods and the list goes on.
Divorced transfer cases have a driveshft between the transmission and transfer case, used in the earlier model 250 and up trucks back in the 70's and earlier.
Married transfer cases bolt right to the back of the transmission, that started in the 80's on the 3/4 ton and up trucks.
www.usgear.com
www.gearvendors.com
You can look at both units, prices, specs and installation requirements.
The Gear Vendors does not, it only works while in two wheel drive.
The US Gear is a huge unit, it also allows spliting gears.
The Gear Vendors unit is small, replaces the tranny tailshaft or the transfer case rear housing and allows splitting gears.
By splitting gears I mean 1st, 1st over, 2nd, 2nd over, 3rd, 3rd over, 4th, 4th over with a four speed. Same thing with a C6, but third over is your top gear.
Both require rear driveshafts be shortened, but the US Gear also requires making the front shafts longer.
The US Gear also needs to have the front fuel tank shortened, the floor pans bent upward, transfer case linkage mods and the list goes on.
Divorced transfer cases have a driveshft between the transmission and transfer case, used in the earlier model 250 and up trucks back in the 70's and earlier.
Married transfer cases bolt right to the back of the transmission, that started in the 80's on the 3/4 ton and up trucks.
www.usgear.com
www.gearvendors.com
You can look at both units, prices, specs and installation requirements.
ALL BOW DOWN TO YOUR MASTER!
or should I call you Master Sponaugle?
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
I am just one of the old guys that think new is not always better.
I also look at a lot of ways to make old better than new.
If I had more money and more time, I would have to sleep in my truck with a gun.
Someone would want to come and take it if it was left alone for a couple hours.
I also look at a lot of ways to make old better than new.
If I had more money and more time, I would have to sleep in my truck with a gun.
Someone would want to come and take it if it was left alone for a couple hours.
Thread Starter
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Senior User
Joined: Jan 2007
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back to the gears, I only run the 2 wheel drive, w/ all the crazy mods to run the us gear is just out of the question, I am considering the gear vendors though I'm just not sure if I'd be happy w/ it especially considering how much it will cost to finish the project, one thing is for sure though, I'm soon to be swapping in a set of 3.73's in the rear in place of the 4.10's I have in right now, I think with 3.73's I'll be happy w/ both the take off and the top end.... then if I ever do put the gear vendors in I'll have even more top end than I'll need plus a decent 0-60, my truck w/ the 3.55's is just such a dog off the line, but the drag w/ the 4.10's is even w/ an o/d you still can only get up to like 85mph tops... to me that sucks so i'm just picking between the 3.73's or some 3.55's, my old truck w/ the 3.55's would do 90mph w/ a couple thousand lbs in the bed like there was nothing there, what gears would anyone else chose to go w/ a C6 w/ a gear vendors o/d?
Senior User
Joined: Dec 2006
Posts: 344
Likes: 3
From: Byron New York
I have a C6 with 3.55's in my winter truck. It plows decent especially with a huge cooler I put in. I chose this so I could drive to work and still work the truck. It tows decent, plows decent, and 65mph is 2600-2700 rpm's. Good all around set up and if I need to push that heavy wet stuff 4x4 Low works nice.
3 spd and 3.55's.
My summer truck has the E4OD and 4.10's and cruises very nicely and fuel mileage is decent, tows decent.
4spd Auto 4.10's
Your set up with gear vendors go 4.10's because you will have the OD. You will keep your low end and make up the top end. My 2 pennies.
3 spd and 3.55's.
My summer truck has the E4OD and 4.10's and cruises very nicely and fuel mileage is decent, tows decent.
4spd Auto 4.10's
Your set up with gear vendors go 4.10's because you will have the OD. You will keep your low end and make up the top end. My 2 pennies.
Elder User
Joined: Apr 2006
Posts: 894
Likes: 0
From: South Dakota
US gear offers a dual range overdrive unit. It is able to split any gear higher of lower as one of you previously stated. I looked into a new one and they run about $3000 new. I plan to go with a 3.55 rearend gear instead as it is alot cheaper. But I did have one question, has anyone messed with the idea of the 2 spd rear axle? I have seen them before on quite a few heavy duty trucks but are they reliable? Is it even possible for an IDI?
Logistics Pro
Joined: Feb 2005
Posts: 3,952
Likes: 117
From: Upper Left Coast
The E4OD is also a pretty strong transmission if taken care of.
I have one that came out of a 15,000 GVW 7.3L Super Duty The truck and trailer (with the mini excavator on it) weighed in excess of 20,000 lbs and it survived.
The E4OD also has a lock-up torque converter (C-6 doesn't)
I'll eventually put a 6.9/7.3 engine in front of this trans(I'll rebuild it) and put it in my 55 F-600
Regards,
Rick
I have one that came out of a 15,000 GVW 7.3L Super Duty The truck and trailer (with the mini excavator on it) weighed in excess of 20,000 lbs and it survived.
The E4OD also has a lock-up torque converter (C-6 doesn't)
I'll eventually put a 6.9/7.3 engine in front of this trans(I'll rebuild it) and put it in my 55 F-600
Regards,
Rick
Posting Guru
Joined: May 2003
Posts: 1,242
Likes: 3
From: Joliet, Illinois
Originally Posted by Dave Sponaugle
Gear Vendors gives you an overdrive in each gear,
So all the forward gears are now taller than 1:1?
NO.
The only gear that will be overdrive will be the 3rd with the GV in high, all the others will just have a ratio inbetween the regular gears.
Originally Posted by Dave Sponaugle
so you wind up with 6 forward gears with a C 6 transmission.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
Sorry but any time the output shaft is turning faster than the input shaft it is being over driven.
Adding the Gear Vendors is adding an auxiliary over drive transmission in the drive line.
When the Gear Vendors unit output shaft is turning faster than it's input shaft it is in overdrive.
When you are in first gear and the overdrive is engaged, the drive shaft is turning faster than the transmission output shaft.
The first gear transmission ratio is being over driven before the drive shaft.
In fact you should also have over drive in reverse.
An over drive final drive ratio, one where the drive shaft is turning faster than the crankshaft what you are referring to.
Yes you only have one gear that can result in an overdrive final drive ratio, that is third gear in a C 6 and 4th gear in a T 19.
ZF 5 transmissions would have overdrive in fourth gear and double overdrive in fifth gear.
E4OD would be overdrive in third, double over in fourth.
ZF 6 would be overdrive in fifth, double over in sixth.
You can also find under drives and overdrives in belt and pulley setups as well as chain and sprocket setups.
Adding the Gear Vendors is adding an auxiliary over drive transmission in the drive line.
When the Gear Vendors unit output shaft is turning faster than it's input shaft it is in overdrive.
When you are in first gear and the overdrive is engaged, the drive shaft is turning faster than the transmission output shaft.
The first gear transmission ratio is being over driven before the drive shaft.
In fact you should also have over drive in reverse.
An over drive final drive ratio, one where the drive shaft is turning faster than the crankshaft what you are referring to.
Yes you only have one gear that can result in an overdrive final drive ratio, that is third gear in a C 6 and 4th gear in a T 19.
ZF 5 transmissions would have overdrive in fourth gear and double overdrive in fifth gear.
E4OD would be overdrive in third, double over in fourth.
ZF 6 would be overdrive in fifth, double over in sixth.
You can also find under drives and overdrives in belt and pulley setups as well as chain and sprocket setups.
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New User
Joined: May 2008
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The US Gear V2OD comes in a 30% reduction as well. The manufacturer is running a sale til the end of May 2008 ti the retailers. This would be a good time to price shop and get a good bargain.
Last edited by Dave Sponaugle; May 7, 2008 at 11:58 PM. Reason: Advertising non sponsor, delete link
Post Fiend
Joined: Oct 2007
Posts: 10,501
Likes: 5
From: Faibanks Ak.
You can pick up a gearvender unit used on ebay I have seen them sell for as little as 800 bucks and you con buy the adapter for your application new. I love mine. Dave mine does not work in reverse.
Posting Guru
Joined: Jul 2004
Posts: 1,627
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From: West Valley Utah
The gearvendor unit has to have pressure to shift. If I remember right, gearvendor says about 17 mph before shifting. There is a speed sensor mounted on the speedometer cable with a couple wires going to the control box. The sensor is also a "trouble spot" if the unit starts to suddenly shift out of OD under light throttle at freeway speeds. Not a good thing with a 2500rpm cummins.
When you shift the transfer case into 4 hi/low, and then put back into 2 hi, the unit will not shift until you shut the ignition off. Another design feature to keep you from having problems with 2 different gear ratio's.
All in all, the gear vendor and US gear units are both tough, reliable and will help. They are expensive, easy to maintain but I still think I'd rather have a 5 or 6 sp main and a 4sp OD brownie.
If I had all the gear boxes I figure I need, my rear driveline would be about a foot long.
When you shift the transfer case into 4 hi/low, and then put back into 2 hi, the unit will not shift until you shut the ignition off. Another design feature to keep you from having problems with 2 different gear ratio's.
All in all, the gear vendor and US gear units are both tough, reliable and will help. They are expensive, easy to maintain but I still think I'd rather have a 5 or 6 sp main and a 4sp OD brownie.
If I had all the gear boxes I figure I need, my rear driveline would be about a foot long.
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