overdrive opinion

['68OrangeSunshine]

Would a Gear Vendors OD work in a '67 K/10 Suburban w/ TH350/NP205? Or are you only considering 2WD here?

[davischevy]

Originally Posted by '68OrangeSunshine

Would a Gear Vendors OD work in a '67 K/10 Suburban w/ TH350/NP205? Or are you only considering 2WD here?

Yes.

[davischevy]

We have two 700R4 behind big blocks.

['68OrangeSunshine]

Originally Posted by davischevy

Yes.

Good to know.

[Sheepdip]

Originally Posted by '68OrangeSunshine

Would a Gear Vendors OD work in a '67 K/10 Suburban w/ TH350/NP205? Or are you only considering 2WD here?

To answer your question, the GV Unit is a lets say generic unit and you buy the proper adapter (if they make it) for whatever tranny you are running. They do make them for various 4WD Xfer case applications but they can only be used in 2WD Xfer case gear selection.

[lil hoodlum]

Thanks..

You guys really are having me wanting a Gear Vendors OD in my set up. 1968 C10, 327, 3 speed manual, 3:73 rear end....

['68OrangeSunshine]

Originally Posted by Sheepdip

To answer your question, the GV Unit is a lets say generic unit and you buy the proper adapter (if they make it) for whatever tranny you are running. They do make them for various 4WD Xfer case applications but they can only be used in 2WD Xfer case gear selection.

So I couldn't split gears in 4WD? Of course I already have 4 HI and 4 LO in the transfer case.

[Sheepdip]

Originally Posted by '68OrangeSunshine

So I couldn't split gears in 4WD? Of course I already have 4 HI and 4 LO in the transfer case.

The GV unit needs a driveline/speedo speed of approximately 40mph to engage, the GV unit only mates/transitions to the rear driveline not the front, it works in 2WD high only.

In a 4x4 you can't have front and rear driveshafts rotating at different RPM's.

GV would be able to answer all of your questions better than I, They are very knowledgeable about their product.

['68OrangeSunshine]

Originally Posted by Sheepdip

The GV unit needs a driveline/speedo speed of approximately 40mph to engage, the GV unit only mates/transitions to the rear driveline not the front, it works in 2WD high only.

In a 4x4 you can't have front and rear driveshafts rotating at different RPM's.

GV would be able to answer all of your questions better than I, They are very knowledgeable about their product.

Well, thanks for your time and expertise.

[HO455]

Originally Posted by '68OrangeSunshine

So I couldn't split gears in 4WD? Of course I already have 4 HI and 4 LO in the transfer case.

I was unable to find the pictures of an automatic transmission with the GV between it and the divorced transfer case i have.

Here is a thread with some other 4x4 OD options.


http://67-72chevytrucks.com/vboard/s...d.php?t=729273

[gmc684x4]

I got mine for free it came with a van with a blown intake gasket
Pick a parts craigslist facebook marketplace are the kind of places to look for a deal 2500 3500 vans can be the easiest to find as they should have a 4l80e in the vans there less motor dependent

[jocko]

If the options are 700R4 or TH350 with GV O/D, the strength benefits of the GV unit are somewhat irrelevant as the trans will be the weaker (not weak, but weaker) link compared to the GV. 700R4 about the same strength as the TH350 in stock, form. I disagree on a couple points - a 700R4 is not necessarily "simpler" - the GV unit is pretty darn simple too, and there's no TV cable setup that one can screw the pooch with in a GV setup (not that TV is hard, it's just something you have to be aware of and set up properly). A TH350 and a 700R4 can be built to be built to withstand some abuse, but it takes a little coin to make either stand up the abuse a stock TH400 or 4L80E can withstand. It really comes down to what you plan to do with the truck - if you're going to REALLY abuse it, then you'll either need to sink some money into the TH350/GV or 700R4 - so I'd recommend leapfrog to a TH400/GV (if you happen to have a TH400 lying around or can find one that's somewhat inexpensive), or just go with a 4L80E. If you're just going to drive like a normal human being that drives a truck and not a gasser wannabe, then TH350/GV or 700R4 will be more than sufficient. Personally, I like the GV unit - and my preferred approach is to not alter the original driveshaft - remove it and save it - and shorten a non-original driveshaft so that I can return to bone stock if I ever want to. If your truck isn't original, then there's no need to worry about that aspect. Again, if you're just going to drive it normal-like then EITHER approach you're considering will work. A GV unit will run you $3K unless you're shopping for a used one - and used ones are easily worth $1500-2500 because they are very durable.

[davischevy]

The reason I didn't put a GV in my Longhorn?
I didn't think of it.

[jimijam00]

The TV cable isn't that big of a deal as long as you know there is one, what it does, and that is has to be set correctly. Bowties sells an idiot proof TV setup.

[ChevyRacefan]

The G/v is tested to handle 2000hp and hard drag strip launches.
The 7004r is never going to be this strong and last . No matter who the builder is.
The 7004r requires the tv cable adjustment to be on the money or kiss your transmission bye bye. The 4l60e (computer controlled 7004r) requires a controller. and not much stronger. If I was the o/p and did not want to go with the G/V I would bypass the thought of a 7004r/4l60e and go straight to a 4l80e. In basic terms it is a th400 with o/d.
Build a 7004r if you want. but plan on rebuilding it a few times if you don't get everything correct, The tv cable, the cooler, the lock up clutch. It can be done. but many don't and burn them up in short order.

[gmc684x4]

https://sites.google.com/site/sloppy...ans-controller

[72c20customcamper]

Another advantage to GV is if you sell the truck you cant take out the unit and put it in the next one

[jimijam00]

Who drives around town with their 700R4 in OD and complains it hunts for gears? OD is for the highway.

[SCOTI]

Originally Posted by jimijam00

Who drives around town with their 700R4 in OD and complains it hunts for gears? OD is for the highway.

People who just put it in 'drive' & go.

[jimijam00]

Originally Posted by SCOTI

People who just put it in 'drive' & go.

You mean "overdrive" and go? Having four gears, the fourth is overdrive, not drive.

[SCOTI]

Originally Posted by jimijam00

You mean "overdrive" and go? Having four gears, the fourth is overdrive, not drive.

No.... I meant what I said.

'Drive' is what most everyone typically puts their vehicle in w/o thinking about it to go forward unless they were doing something out of the ordinary in which case they selected a lower gear. They aren't typically thinking about how the gear selection is ID'd or labeled.... It is/was the 1st forward selection/option after neutral.

On corporate mass-scale calibrated vehicles that were equipped w/OD transmissions, just doing so worked since it automatically transitioned to that final gear & actuated the lock-up for the converter. Vehicles that were altered from the mass-calibrated standard & aftermarket set-ups, not so much. They required the original 'DRIVE' or 3rd gear.

Call it whatever you need to.

[MikeB]

Originally Posted by jimijam00

You mean "overdrive" and go? Having four gears, the fourth is overdrive, not drive.

Semantics. I knew what he meant. And I'll bet the new car owner's manuals back then said to place the shift lever in OD for normal driving.

I mean, >99% of drivers just want to put it in gear and go! And use lower gears only in the mountains, if they even understand that concept.

[MikeB]

Originally Posted by SCOTI

People who just put it in 'drive' & go.

Isn't that expecting a bit much from GM? I still remember driving an early 80s Chevy rental car that would "shift and shudder" at around 45 mph. At the time I thought it was just an overly tall axle ratio, but it was probably a combo of shifting in to 4th and locking the converter at the same time. Very crude ways to achieve higher EPA estimates back then.

At that time, I owned a mid-70's Buick Regal with a TH350, and it was a breath of fresh air compared to the early 80s crap.

[HO455]

Originally Posted by jimijam00

Who drives around town with their 700R4 in OD and complains it hunts for gears? OD is for the highway.

My ex for one! She bought a new 89 S10 and put it in OD every time she drove it. No matter how many times I told her not to. She said the dealer told her to do it that way and they knew more about it than I did.
Well that was one more thing that didn't go well. When I said you better start saving for a new transmission because when it fails I wasn't going to pay for the repair. It did and I didn't.

[jimijam00]

Originally Posted by HO455

My ex for one! She bought a new 89 S10 and put it in OD every time she drove it. No matter how many times I told her not to. She said the dealer told her to do it that way and they knew more about it than I did.
Well that was one more thing that didn't go well. When I said you better start saving for a new transmission because when it fails I wasn't going to pay for the repair. It did and I didn't.

Lol. What's even scarier, you and I seem to be the only two that know that.