Gear Vendors overdrive....actual details - Page 3 - Dodge Cummins Diesel Forum
98.5-02 Performance Parts Discussion Discussion of Performance Parts For the 98-02 Trucks No Advertising ...NO ADVERTISING

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post #25 of 51 (permalink) Old 04-16-2019, 07:48 PM
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How long have you had it in your 05? I had an 06 g56 truck and wanted one back about 5 years ago for highway bombing (70mph speed limits in LA, 80 in most of TX, and annual road trips home to PA) but when I called Gear Vendors they strongly DISrecommended it. Said it wouldn’t take the torque. I pointed out all the Drag Week cars running them for driving between tracks and their reply was “they’re significantly detuned when the unit is engaged”. Not sure how far one could detune a billet 672 big block, but whatever...

Point is, I wonder if they’ve made changes recently where the units can tolerate higher input torque like we have with the common rail or tuned / modded 12- and 24-valve trucks.


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post #26 of 51 (permalink) Old 04-16-2019, 08:14 PM
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Wow, that's not what they told me! And I read up on these units prior to even thinking about buying one that they were used on race cars and such. When I did talk to GV about one for my truck, they said you'll never have to worry about breaking it because of too much HP or torque.

I think I got it in 2007, and been towing heavy numerous times since, and have my power turned up a bit to around 380/750 versas the stock 325/610 with absolutely NO issues with oil changed ever 10K just as the book says, and using either mopar ATF or mopar premium manual transmission gear lubricant.

2005, 2500, Quad Cab, "Big Horn" Edition, 4X4, Longbed, G56 6 speed trans, Jake Brake, Gear Vendors Overdrive, Cool (blue) hose/cold air intake, TST PowerMax CR, 100 gal aux fuel/tool box, "lost" Cat, and Banks muffler.
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post #27 of 51 (permalink) Old 04-16-2019, 08:55 PM
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I have one as well. I have it on my 03 cummins. It used to have a 5.9 and an nv4500 tranny. It now has a built 6.7 and an eaton FSO-8406A. I have 4.10 gears but with 37 inch tires. For me, I only use it when I am going 70+mph. It will do approx 1750rpm at that speed. I have towed 11k lbs with it up Washington passes(not engaged though) and nothing has broken yet. I have put 800 hp thru it and so far it can take if (with it not engaged). I really only use it for cruising on freeway. Otherwise it isn't engaged. I like it, especially for the long trips. I haven't noticed any fuel savings with it though. The funny thing is if I have it in 5th gear (direct drive) and turn on the overdrive, it has the exact same gear ratio as if I had it in 6th. Once I have it engaged on the freeway, I usually won't turn it off until I am on an off ramp. It has a pretty violent clunk when you turn it off and i make sure I at least have the transmission in neutral when I do that. It is much less pronounced when going at slow speeds.

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post #28 of 51 (permalink) Old 04-16-2019, 09:57 PM
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I have two friends with this unit on chassis cabs with diesels and 4.88 gearing. Both have had failures due to exhaust braking through the mountains when loaded. Neither have had issues while under power.


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post #29 of 51 (permalink) Old 04-16-2019, 10:30 PM
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Quote:
Originally Posted by mykeb View Post
So...all that to say, their 4x4 warning...is for the same people that require a warning on blowdriers, saying not to use in the shower.
Sad to say but that’s the society we live with now days.

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post #30 of 51 (permalink) Old 04-16-2019, 10:41 PM
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I wonder why no one builds a 2 speed axle like trucks used to have. Had a number of 500/600 series dodge trucks and all had 2 speed axles that allowed splitting all gears. They had a 5.8:1 direct drive and 8.1:1 under drive in those trucks. 4 or 5 peed tranny’s and the 2 speed axle doubled the gears. Could split shift going up or down gears. Wouldn’t work on a 4x4 though.

Just a thought! How about others that have driven these?

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post #31 of 51 (permalink) Old 04-16-2019, 11:40 PM
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So let me get this straight for clarification... You can not use an exhaust brake with a GN? Or...you can not use an exhaust brake with a GN only in certain gears? I'm confused.

And, I certainly dont want to invest a few thousand into something that only adds more confusion.

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post #32 of 51 (permalink) Old 04-17-2019, 12:07 AM Thread Starter
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You wire the exhaust brake in, so the GVs and exhaust brake are not on at the same time.
Or you just disengage you GV when descending a hill.
I've talked to GVs about, it's a non issue with normal comments sense.
I aim to order an exhaust brake in the near future for my truck. GV for going up.the hill, exhaust brand for going down.
Basically, GV has a bunch of overly cautious safety warnings, put in place for people that really shouldnt operate a truck.
Normal person who remotely understands how a truck operates, GVs is an amazing product

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post #33 of 51 (permalink) Old 04-17-2019, 12:14 AM Thread Starter
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I've put around 50k +/- on my unit now.
I would have zero hesitation to put an exhaust brake on the truck.
You generally are not going to be going down the hill, in overdrive.
So you really have no concern there.
Cant speak for an auto, but with a manual trans, engaging/disengaging the unit is as natural as shifting from 4th to 5th.
I wouldnt put a GV on a fleet truck, where any random waterhead is going to hop behind the wheel. For them, you want to keep it as simple as foolproof as possible. 1 go pedal, 1stop pedal, etc.

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post #34 of 51 (permalink) Old 04-17-2019, 12:44 AM
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How much? For a GV
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post #35 of 51 (permalink) Old 04-17-2019, 06:51 AM
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My 1990 W250 has the 727 3-speed auto with a GV unit, and a 3:07 differential. The GV unit is a welcomed addition when your driving a 3 speed

1990 Dodge W250 - Standard Cab - Long Bed
HD 727 Auto with Gear Vendors
3.07 Gears (2.39 with GV engaged)
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post #36 of 51 (permalink) Old 04-17-2019, 07:36 AM
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Quote:
Originally Posted by KATOOM View Post
So let me get this straight for clarification... You can not use an exhaust brake with a GN? Or...you can not use an exhaust brake with a GN only in certain gears? I'm confused.

And, I certainly dont want to invest a few thousand into something that only adds more confusion.
You cannot split gears while using an exhaust brake on a diesel. It is only strong enough to use compression braking of a gasser.

I’m current on the return drive from the east coast and even use my EB on rolling interstates (like I-40) to control speed. The GV overdrive would have limited use for me if I had to constantly use service brakes.


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