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#1 |
Registered User
Join Date: Nov 2014
Location: Columbiana Ohio
Posts: 1,210
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Anyone using Gear Vendors Over/Under Unit?
Anyone here using the Gear Vendors Over/Under unit on a TH350 or TH400? You like? Pros and cons? Im reading it makes you 3 speed act like a 6 speed high/low.
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"Hey... its only time and money right? Just do it." 67 Short Bed under major construction http://67-72chevytrucks.com/vboard/s...=651356&page=8 |
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#2 |
Registered User
![]() Join Date: Oct 2011
Location: Victoria, B.C
Posts: 3,794
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Re: Anyone using Gear Vendors Over/Under Unit?
A buddy of mine went the Gearvendors route in his '68 Charger RT/440. He seems to like it....makes it interesting.
It hasn't given him any real problems at this point...and his (440) engine is making some nice power through it. The main advantage is the top highway gear....the other gears don't make too much difference to any regular driving (mostly novelty shifts)....so consider it for the overdrive (top gear) advantage only. That said, they are not giving it away by any means from a price point. I would simply look for a Heavy duty 700 Series or a 4L60....probably quite a bit cheaper and simpler swap out. all good Coley
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....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL 1966 Chevy 1/2 ton (Florida- Red/white) 1972 Chevy 1/2 ton (California- Blue/white) 2005 Chevy Silverado HD2500/Duramax 2000 Dodge Ram 1500 |
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#3 |
Registered User
Join Date: Dec 2004
Location: Arvada Colorado
Posts: 1,321
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Re: Anyone using Gear Vendors Over/Under Unit?
I had one on my 1970 CST that I sold a couple of years ago. It was fun. Pretty pricey though. I liked it. The new owner likes it too. It was on a TH350 and it was easy to install.
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Larry 1949 Willys CJ2A, Kubota Turbo Diesel engine, Warn Overdrive, 11 inch brakes, 12volt, Warn M8000 Winch "Little Green" 1970 Rustoleum Roller Red C20 Custom Camper 454 TH400 "Big Red" 1971 K20 6.2 Turbo Diesel 4x4 4spd Ranger Overdrive "Pumpkin Wagon" 2005 VW Beetle Diesel 44+ MPG "Silver Bullet" |
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#4 |
Registered User
Join Date: Sep 2007
Location: Katy TX
Posts: 1,268
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Re: Anyone using Gear Vendors Over/Under Unit?
I have two of them both behind my 650 hp blower motors. that is the main reason for both. the gear vendors will handle up to 1200 hp in their stock configuration and can be modified to hold 2000 hp. I agree with others here that they are pretty expensive but the really work well for high HP engines. one is 12 years old and the other is 9 years old and both have seen the rath of these blower motors with out a hint of problems.
my other vehicles with stock engines all have 700 r or 4l60 in them. the only reason I would use a gear vendor is hp over 500.
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![]() Slammed 53 5 window Blown/Bagged 54 Pickup Patinaed 67 LS stepside Supercharged 67 Nova Bagged 69 Suburban Turbo'ed 5.3 LS |
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#5 |
Registered User
Join Date: Nov 2014
Location: Columbiana Ohio
Posts: 1,210
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Re: Anyone using Gear Vendors Over/Under Unit?
Yeah that do cost a lot but I like how it splits the gears keeping you in the power making RPM range with no over revving or lugging. That and the OD. Still mowing over options....
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"Hey... its only time and money right? Just do it." 67 Short Bed under major construction http://67-72chevytrucks.com/vboard/s...=651356&page=8 |
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#6 |
Registered User
Join Date: Nov 2011
Location: Idaho
Posts: 857
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Re: Anyone using Gear Vendors Over/Under Unit?
I rode in a 72 GMC once that was powered by the GM 300hp crate motor. We were pulling a 37 chevy on a car trailer through the mountains. I was real impressed how effortless the truck was working when the gears were split.
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#7 | |
Account Suspended
Join Date: Jan 2007
Location: Tucson
Posts: 2,183
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Re: Anyone using Gear Vendors Over/Under Unit?
Quote:
The trans/overdrive combo is long (on mine the yoke is just 8 inches in front of the trailing arm crossmember) so you will need a MUCH shorter driveshaft. It will handle more torque than a 700R4 so for me it was a much better choice. |
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#8 | |
Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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Re: Anyone using Gear Vendors Over/Under Unit?
Quote:
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67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ![]() 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6 |
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#9 | |
Registered User
Join Date: Nov 2014
Location: Columbiana Ohio
Posts: 1,210
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Re: Anyone using Gear Vendors Over/Under Unit?
Quote:
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"Hey... its only time and money right? Just do it." 67 Short Bed under major construction http://67-72chevytrucks.com/vboard/s...=651356&page=8 |
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#10 |
Registered User
Join Date: Jan 2010
Location: Here
Posts: 5,484
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Re: Anyone using Gear Vendors Over/Under Unit?
Ttt. I am thinking about putting a gv in my swb and wanted to know if the cross member needs to be moved as well. My bad just realized Fitz account was suspended.
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#11 |
Registered User
Join Date: Jan 2012
Location: Redondo Beach California
Posts: 146
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Re: Anyone using Gear Vendors Over/Under Unit?
Have one in my motorhome absolutely awesome especially for towing. One of these days I want to put one in my 70. Sure they are pricey but definitely worth it in the long run.
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343 NEVER FORGET 9-11 FIGHT ON!!! GO USC!!! PROUD OWNER OF A 1970 ![]() |
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#12 |
Registered User
Join Date: Nov 2016
Location: lowell ma
Posts: 750
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Re: Anyone using Gear Vendors Over/Under Unit?
Only ones that think they are pricey are those that have not priced out a built 2004r or 7004r /4l60 /4l65 and a good converter and in the electric controlled trans the shift controllers..
You will find the 2200-2300 is not pricey when you find a built g.m. o/d automatic will run you 3500-4500 ... Most that have a 2000-2500.oo built 7004r don't have them last for long.. Many get by with them, but then again never really use the power the engine has either.. A th200 can live behind a 500 hp engine if you never hammer it.. |
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#13 |
Special Order
![]() ![]() Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,859
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Re: Anyone using Gear Vendors Over/Under Unit?
I was going to say the same type of thing. A Gear Vendors unit isn't expensive at all when you figure they all outlast even the best O/D automatic. GVs get taken from one vehicle and moved to the next when their host vehicle gives up the ghost. And, if you ned brute strength, they are the way to go. It's a gear box, nothing complex.
I had one in the diesel '84 K/30 I had with Banks Sidewinder. I absolutely loved it behind that TH400. I plan to one day have one in my '67 SWB 327/M22/3.42s for an ultimate hot travelin'/haulin' truck rod.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#14 |
2WD Jimmy
![]() Join Date: Mar 2005
Location: Davis County, Utah
Posts: 2,564
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Re: Anyone using Gear Vendors Over/Under Unit?
A Great piece of equipment. Top Notch reliable.
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#15 |
Registered User
Join Date: Dec 2004
Location: Arvada Colorado
Posts: 1,321
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Re: Anyone using Gear Vendors Over/Under Unit?
I did not have to move the crossmember at all. I had a short shaft TH350 and the GV adapter just bolted on to the back of the transmission. I did have a new shorter driveshaft made. Very easy install as I recall.
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Larry 1949 Willys CJ2A, Kubota Turbo Diesel engine, Warn Overdrive, 11 inch brakes, 12volt, Warn M8000 Winch "Little Green" 1970 Rustoleum Roller Red C20 Custom Camper 454 TH400 "Big Red" 1971 K20 6.2 Turbo Diesel 4x4 4spd Ranger Overdrive "Pumpkin Wagon" 2005 VW Beetle Diesel 44+ MPG "Silver Bullet" |
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#16 | |
Senior Member
![]() Join Date: May 2012
Location: Scottsdale, AZ
Posts: 1,906
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Re: Anyone using Gear Vendors Over/Under Unit?
Quote:
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White K20 |
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#17 |
Registered User
Join Date: Jan 2017
Location: Valley, NE.
Posts: 1,007
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Re: Anyone using Gear Vendors Over/Under Unit?
I have a 2wd, 1987 Sub. 2500, 454, t-400 with 4:10 rear gears. The PO installed a US Gear under/overdrive unit, and I love it.
I agree that you don't switch up and down with each shift, (not practical) but it is useful when running empty to reduce the engine rpm. It takes the 4:10 and reduces it to about 3:10. I have towed many times in the lower numerical range, and the truck responds well with plenty of power. If you get into hills, lower gearing is just a click away. As far as fuel economy, there is no such thing with a 454/t-400 combo, but I figure that keeping the RPMs down at highway speeds is good for my engine. Greg |
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#18 | |
Registered User
![]() Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
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Re: Anyone using Gear Vendors Over/Under Unit?
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#19 |
Registered User
Join Date: Feb 2003
Location: Santa Ana, CA
Posts: 2,191
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Re: Anyone using Gear Vendors Over/Under Unit?
I've had my Gear Vendors unit for several years now in my K5 Blazer. Had it hanging off the back of my NP205 transfer case when I ran a TH350 auto, and now have it hanging off the back of the same NP205, but now I run an SM465 4 speed. Probably the best upgrade I've ever made, and I've made a lot of nice performance upgrades
![]() I found the Gear Vendors complete with all wiring, switches, and brain in an '86 2 wheel drive Suburban behind a TH400 at an Ecology Pick a Part several years ago when the cash for clunkers incentive was going on in California. Everyone was cashing in their older rides. Got it for $100. |
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#20 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,110
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Re: Anyone using Gear Vendors Over/Under Unit?
I have one for my Javelin and the only shortcoming with it is no lock up converter with a T400. That would be the ultimate set up.
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. ![]() RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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#21 | |
Collector of Projects
Join Date: Apr 2003
Location: Las Vegas
Posts: 3,106
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Re: Anyone using Gear Vendors Over/Under Unit?
Quote:
![]() I wouldn't have tried to squeeze it in a lifted Blazer for fear of driveline angle... but a low long wheel base truck... |
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#22 |
Registered User
Join Date: Feb 2003
Location: Santa Ana, CA
Posts: 2,191
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Re: Anyone using Gear Vendors Over/Under Unit?
Everyone seems to think that. But it actually fits really well with a perfect driveline angle. I had to source out a 300 series slip yoke from a Cadillac application, which combines the slip yoke and CV joint into the shortest known factory setup. I then cut the spring perches on my rear axle and rotated the axle pinion to point right at the GV output. No vibration, and plenty of play in the slip yoke for axle movement. Been this way for 7 years now. Attached are some old pics during the install.
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#23 |
Just here to tinker
![]() Join Date: Jun 2008
Location: Holland, MI
Posts: 3,692
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Re: Anyone using Gear Vendors Over/Under Unit?
I had a gear vendors in my little '78 diesel with T400 and loved it! Made all the difference in the world being able to split gears when towing up a hill.
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78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(winter unit)https://67-72chevytrucks.com/vboard/...25#post8900725 |
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