I cant run a gear vendors overdrive

[DerekW]

I just got off the phone with the sale staff at gearvendors the makers of that overdrive unit yal love so much. after talking to him for a few minutes i quickly realized it wasnt for me. i read on their website they were not only adding to the overall OD they were adding speeds in between my 48re this would a 48re tremdously cuz it would make it more of a close ratio transmission which translates to alot of positive things. My reason for looking into it was increase in topspeed with rpm reduction and making my 48re live longer by having closer ratios.



COME TO FIND OUT they are bolting these units on the back of the transfer cases on 4wd's and on the back of 2wd trannies. I personally find myself needing 4wd on the street spring summer fall winter. I cant never hook up in bad conditions and making u-turns on a 4 lane highway with a big grass median between the two directions of traffic is impossible on sundays and late on saturdays with the beach traffic rolling through town unless i have it in 4wd. I dont have any noticeable bidding or skipping in the front end those who say 4wd is bad on street. too much power = lots of spinning or drifting which traslates to ******* off state trooper OR getting rear ended.



those of you who use 4wd in snow ice rain, mud just forget about gearvendors UD/OD. wish i knew of a company that offered a splitter to go in between my t-case and transmission i could shift while going down the road.

 

[MotleyCrueCab]

solution

What i have seen done in the past on other peoples rigs is to put a the Gv on the back of the transmission and run the t case divorced, that way you have all speeds in 4x4 as well. However i've only seen this approach on older trannys such as c6s and turbo 400's im not familiar with the specifics of your transmission and i'm not sure if there is a way to bolt a gv directly to it, but its something worth looking into.

 

[cwbyinjeep]

I believe there is a way to install a governor on the GV unit so that it will not operate when in 4x4. I personally don't see the need to run a GV and 4x4 at the same time. If it's that crappy out to be using 4x4, chances are you're not needing the highway cruise mode which is the biggest benefit you seem to be searching for.

 

[DerekW]

no the benifit i am searching for ISNT stacking overdrives for MPG. Iguess people here on TDR are not understanding the GV UD/UD unit and how it works. i think many people just think it is an additional overdrive to use ontop of there existing overdrive while cruising down the highway. That is BUT IT ALSO acts as a gearsplitter. your 4 speed 48re with lock up convertor (can lock in 2nd, 3rd, and 4th with VB) which makes it LIKE a 7 speed. By adding the GV gear splitter it really makes your transmission pretty much a close ratio 11 speed transmission. THIS is what i am after. this only helps the 48re to live longer as clutches arent having to work nearly as hard. to hold a gear when for instance OD and lockup happens simotaneously. having another speed in between direct drive and OD would help my transmission along with all other speeds. Not to mention having a lower 1st gear would be very handy opposed to 4wl all the time.





It is a very common misconception here on TDR that I really wish a GV represenative woudl jump on here and clearify or even in the next TDR issue. The GV UD/OD is not only for an additional OD. i would only use my GV OD on top end when i am drag racing at track or late getting somewhere in the country during very early hours of the morning. but stacked overdrives in my case wont help my mileage.

 

[DerekW]

I believe there is a way to install a governor on the GV unit so that it will not operate when in 4x4. I personally don't see the need to run a GV and 4x4 at the same time. If it's that crappy out to be using 4x4, chances are you're not needing the highway cruise mode which is the biggest benefit you seem to be searching for.

transmission guys i used to hang with in carolina were happy when the governors disappeared cuz they all the time stuck.

 

[mattymac]

I thought that they didnt hold up to the torque of our trucks? Even though they say that alot of drag guys use them I thought I remember some higher hp diesel guys eating them like candy?

 

[JonKing]

usgear makes one that bolts inbetween the transmission and transfer case.

 

[llotton]

You can use the GV unit on your truck, you just can't use it in 4x4 mode. The reason for this is that the GV unit connecting to the rear of the transfer case controls the speed of the rear wheels and when is 4x4 that would make the rear wheels and the front wheels try to run at different speeds and really screw things up. As long as the transfer case remains in 2WD there should be no problem.

 

[Matt400]

BUT IT ALSO acts as a gearsplitter.

That sounds good in theory but in reality you won't end up using it that way for everyday driving.

By adding the GV gear splitter it really makes your transmission pretty much a close ratio 11 speed transmission.

Not unless you are willing to shift it that way.



Consider this scenario:

You take off in first and then hit the GV button to get 1st over then you have to hit the GV button again at the exact time the trans goes to second so you are not in second over, then once again hit the GV button for 2nd over... carrying out this timed sequence through all the gears would be so much trouble.



I can only see it useful for splitting gears during a long run while towing when you would want a gear in between for many miles at a time.



If you want one that works in 4x4, take a look at this one:

Dual Range Auxiliary Transmissions, Overdrive and Underdrive

 

[llotton]

I need to correct my reply. The GV unit connects to the rear of the transmission vie a new tail shaft housing adapter.

 

[llotton]

Sorry about that I was right the first time re how the GV attaches.

 

[Vaughn MacKenzie]

I guess I don't see what the big deal is . . . just make sure the GV is in Direct (or turned OFF) so drivetrain speed matches between front and rear axles then shift into 4x4
Certainly if conditions aren't perfect you wouldn't want to be running the GV in OD anyway. . .

 

[DerekW]

I thought that they didnt hold up to the torque of our trucks? Even though they say that alot of drag guys use them I thought I remember some higher hp diesel guys eating them like candy?

i was talking to them and starting to explain that i was planning on adding alot of power to my truck and we got to talking about the adapter lengths and I was telling him I dont want a adapter that is stupid long when i have a 4wd model transmission and t-case i dont need a adapter 6 inches longer between them cuz I didnt want to have to add a carrier bearing to my front driveshaft cuz the front ended up being a full guessing 14" longer than stock. then i realized where he was telling me the GV bolts up and I told him that wasnt working for me. but he kept trying to make the sale and I kept wanting it between transmission and t-case and he couldnt do. finally i told him "because the GV mounts on back of t-case the gear vendors OD is not of interest to me until you consider redesign of location". Honestly I understood loud and clear they aint redesigning for even one off production in between the two. I could have made do with just the GV OD and the adapters and reprogrammed computer (removing 4wd data from software) and made my own crossmembers and had shafts built n balanced and lengthened t-case wiring and vent lines.

 

[DerekW]

You can use the GV unit on your truck, you just can't use it in 4x4 mode. The reason for this is that the GV unit connecting to the rear of the transfer case controls the speed of the rear wheels and when is 4x4 that would make the rear wheels and the front wheels try to run at different speeds and really screw things up. As long as the transfer case remains in 2WD there should be no problem.

dont want to not be able to use it in 4wd. there are many times 4wd is neccessary. i use 4wd about 5 days out of 7 a week. the other night had no other choice than to use it on the street in the rain while doing somethings.

 

[MMeier]

i use 4wd about 5 days out of 7 a week. the other night had no other choice than to use it on the street in the rain while doing somethings.

 

[DerekW]

hmm yeah i seen the USgear OD unit a few years back. I just got off their site. i think thats the more liekly solution but need to talk to them on the phone 1st before i get commited and add it after my twins. the one thing I like about the GV unit is its computer controlled just turn it on and ride. US Gear you gotta fiddle with it all the time. I may try to compare the two units and see if GV controller will work on th US gear with some modds. that would be awsome but if this happens definitely get 2wd model wiring so there aint no lock out trying to prevent two different ratios front to rear as US Gear put the unit in the correct spot.