03-17-2021, 09:19 PM | #26 | |
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Re: overdrive opinion
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I had a 55 Chevy and a 65 Chevelle with 2.73 gears and a 700R4. Overdrive was absolutely Interstate only. I think 3.42 is minimum rear gear for an overdrive to operate properly. Especially with a small block.
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03-17-2021, 09:38 PM | #27 | |
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Re: overdrive opinion
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03-17-2021, 09:40 PM | #28 |
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Re: overdrive opinion
My 55 Chevy has 3.23's with OD and it works great. Yeah, I'm a hyprocrite.
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other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless. |
03-17-2021, 09:41 PM | #29 |
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Re: overdrive opinion
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03-17-2021, 10:34 PM | #30 |
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Re: overdrive opinion
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.
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03-17-2021, 10:51 PM | #31 |
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Re: overdrive opinion
The reason I didn't put a GV in my Longhorn?
I didn't think of it.
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03-17-2021, 11:02 PM | #32 |
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Re: overdrive opinion
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.
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03-17-2021, 11:50 PM | #33 |
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Re: overdrive opinion
One problem, the 700r4 isnt known for great gear ratios or to hold up to any real amount of HP without being built up, I believe the th350 is stronger simply for the fact that there’s no overdrive to hunt in and out of and generate extra heat and wear and tear. Sorry I’m likely a bit cynical as I’ve been bitten by a couple of 700R’s and I have nothing good to say about them. I get what your saying, but I really think in the long run the gear vendors is a better path.
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03-18-2021, 12:29 AM | #34 |
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Re: overdrive opinion
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.
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03-18-2021, 12:39 AM | #35 |
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Re: overdrive opinion
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.... |
03-18-2021, 12:49 AM | #36 | |
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Re: overdrive opinion
Quote:
If you're going to quote someone/something, make sure you tag the correct person.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. Last edited by SCOTI; 03-18-2021 at 01:02 AM. |
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03-18-2021, 05:32 AM | #37 |
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Re: overdrive opinion
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03-18-2021, 05:36 AM | #38 | |
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Re: overdrive opinion
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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03-18-2021, 05:57 AM | #39 |
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Re: overdrive opinion
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. |
03-18-2021, 06:29 AM | #40 |
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Re: overdrive opinion
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03-18-2021, 10:21 AM | #41 | |
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Re: overdrive opinion
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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. |
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03-18-2021, 10:40 AM | #42 |
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Re: overdrive opinion
Another advantage to GV is if you sell the truck you cant take out the unit and put it in the next one
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03-18-2021, 11:31 AM | #43 | |
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Re: overdrive opinion
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As for SCOTI's comments about the car's "tall" gearing, he's right on the money. A 3.73 axle would make a lot more sense. BTW, I was mistaken about tire height. It's actually around 27.5", but still, that 3.36 axle is too tall.
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03-18-2021, 01:56 PM | #44 | |
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Re: overdrive opinion
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Both would work fine w/a mild motor. I'm doing 3.42's/26.5"/.67 4th/3300lb G-body combo (1950rpm @ 45mph in 3rd/local; ~2300 @ 80mph).
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. Last edited by SCOTI; 03-18-2021 at 02:02 PM. |
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03-18-2021, 08:35 PM | #45 | |
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Re: overdrive opinion
Quote:
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Every 25 years I like to rebuild that 292, whether it needs it or not. |
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03-18-2021, 09:33 PM | #46 | |
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Re: overdrive opinion
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Here is a thread with some other 4x4 OD options. http://67-72chevytrucks.com/vboard/s...d.php?t=729273
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03-18-2021, 11:29 PM | #47 |
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Re: overdrive opinion
Who drives around town with their 700R4 in OD and complains it hunts for gears? OD is for the highway.
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03-18-2021, 11:38 PM | #48 |
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Re: overdrive opinion
People who just put it in 'drive' & go.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
03-18-2021, 11:46 PM | #49 |
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Re: overdrive opinion
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03-19-2021, 11:20 AM | #50 |
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Re: overdrive opinion
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