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#1 |
Registered User
Join Date: Oct 2000
Location: From Chicago, Live in Phoenix, AZ
Posts: 6,802
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Anyone running a Gear Vendor or Doug Nash (Now US GEAR) over/underdrive?
I just scored an over/underdrive unit for the turbo 400 in my burb. I was wondering if there is anyone out there that has one of these units on their truck? From what I understand, they are awsume. Nothing like having an available 6 speeds that can pull 30,000 lbs
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Just sitting here contemplating contemplation. |
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#2 |
Registered User
Join Date: May 2002
Location: Gainesville, Georgia
Posts: 704
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Wow, if you got it cheap or free, you scored! I checked them out online and-- Get out your checkbook! Whew, they're expensive! I'd love to have one, though, so if you decide not to use it...
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We made Oklahoma a little after 3, Randy & his brother Bob & my old GMC... |
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#3 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,549
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In my opinion the gear vender unit is the better of the 2, have one in my 68 and it works great. Takes my 4.56 gears down to 3.64
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#4 |
Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,932
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Hey Chris I had asked that too. Put me in line if you decide not to use it. I would like to try one I am using the 400 also and like to keep it but for the money the 700 is generally cheaper.
Let me know if you decide to get rid of it. Thanks Dave
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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#5 |
Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,932
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Kwmech I had a question and never found anybody using one. How does it work on the shifting between gears? I mean say you are in first in the overdrive side and you go to second does it automatically go back to the low side for second? how quick is the splitting?
Thanks
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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#6 | |
Registered User
Join Date: Oct 2000
Location: From Chicago, Live in Phoenix, AZ
Posts: 6,802
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Quote:
To shift down, from DIR to UD in our case, the driver backs off the gas, pushes the shift button, then taps the gas to take the preload from the driveline, which allows the synchronizer to pop into -place. An upshift is just as painless. When cruising steadily, the driver hits the shift button while accelerating a little, then quickly taps off the gas for a moment to allow the gearbox to make its shift back to DIR drive.
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Just sitting here contemplating contemplation. |
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#7 |
Registered User
Join Date: Jun 2003
Location: Seattle
Posts: 77
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I run an American Overdrive behind my TH400 w/4.10 gears and it sure is sweet out on the highway. It's a .7 OD that brings me to around 2.87. So at 60 mph it drops from 2600 to about 1800 RPM. It switches with an electric solenoid...pretty much instant. It does not automatically shift in or out of OD when the trans shifts up or down...you have to do that your self. I really only use it when I'm up to cruising speed to get the RPMs down. This is a BB Cheyenne 20 w/a camper, towing a horse trailer set up. You can get some wicked top speed with one of these in an empty truck with the right gear set.
Frito-Lay used to put these in dually BB delivery trucks years ago. The ones that used to pull the trailers around to stores. You might find one in a wrecking yard out west around WA, OR, and CA. I've seen them in P chassis step vans also. American Overdrive used to be in Redding, CA. but they're no longer in business. One nice thing is the internals are all TH parts. Only the case is custom. Mods needed: remove the tailshaft, and shorten the driveline, and replace the front yoke and UJs. Been in the truck 15 years. Tom
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Shop Labor $75, if you watch $100, if you help $125, Wisecracks-$25, Boxjobs-don't even think about it. Yes,Cash. |
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#8 |
Registered User
Join Date: Oct 2000
Location: From Chicago, Live in Phoenix, AZ
Posts: 6,802
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I had the choice of an overdrive or and underdrive unit. Since I have a 3.08 rearend all ready, I decided to go with the 25% underdrive unit. That will make my burb drive like it has a 3.85 rear end until I switch down and my final drive will be the 3.08. This is a much better unit for me since I do a lot of towing in the mountains. I will be able to tow better and still be able to keep my 3.08 rearend gas mileage.
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Just sitting here contemplating contemplation. |
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#9 |
Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,932
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So did you buy this new? I would be interested in the overdrive unit since you had your choice. Is there one available? PM me if you have any info.
Thanks Dave
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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#10 |
Registered User
Join Date: Oct 2000
Location: From Chicago, Live in Phoenix, AZ
Posts: 6,802
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Dave, no I got it used. What trans do you have in your truck?
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Just sitting here contemplating contemplation. |
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#11 |
Registered User
Join Date: Oct 2000
Location: From Chicago, Live in Phoenix, AZ
Posts: 6,802
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Dave, this is a neat little unit that was used back in the late 60's and early 70's on Yenko and Baldwin Motion cars.
http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEBWA%3AIT
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#12 |
Wiseass secured himself a BAN
Join Date: Nov 2000
Location: MOON!!!
Posts: 2,282
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I have a T56 that has an overdrive in 6th of .62. It cost me 4 1/2 hours of install time and $2500.00. I looked at the GV unit and it is WAY over priced. You got a deal if you bought it for less than 3 grand.
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#13 |
Registered User
Join Date: Nov 2001
Location: Springfield, MO
Posts: 2,932
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Thanks Chris. I saw that from your previous post. looks pretty neat honestly I had not heard of them. My tranny is a 400 turbo. I really like it but like the idea of the overdrive. I have 3.73 gears.
67Fleet I agree. They are way overpriced. I wont and cant justify that heafty price. I like most people are looking for a steal of a deal. I would love to have the 6 speed but I also cant justify that cost maybe someday. Once I get my truck back together I will probably drive it for awhile and decide if it is necessary. I had the 3.08 before the tear down but in the process I ended up with the other gears, for performance this is what I wanted. I am installing a new motor and these gears so we will see what it does when it is all said and done.
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Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!" |
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#14 | |
Registered User
Join Date: Oct 2000
Location: From Chicago, Live in Phoenix, AZ
Posts: 6,802
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Quote:
![]() Also, I paid about 1/10 the dollar amount you quoted.
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#15 | |
Registered User
Join Date: Oct 2000
Location: From Chicago, Live in Phoenix, AZ
Posts: 6,802
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Quote:
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#16 | |
Wiseass secured himself a BAN
Join Date: Nov 2000
Location: MOON!!!
Posts: 2,282
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Quote:
![]() Last edited by 67Fleetsidedream; 02-24-2004 at 06:35 PM. |
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#17 | |
Registered User
Join Date: Oct 2000
Location: From Chicago, Live in Phoenix, AZ
Posts: 6,802
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Quote:
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