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Old 08-07-2009, 06:32 PM   #1
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Default Just purchased a Gear Vendors overdrive unit

Anyone have one? I'm looking foward to be able to drive at higher speeds on the highway and supposedly it can be very usefull at the tack as well, keeping your rpms up by effectively giving you gears in between your gears and an extra gear up top if you run out, might be good for a little nitrous.
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Old 08-07-2009, 09:28 PM   #2
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I have one on my one ton diesel F350. It is one of the best investments I've ever made. With 4:10 rear gears I can cruise a 80mph at 1950 rpms in double overdrive.

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Old 08-07-2009, 10:07 PM   #3
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sound cool. I have a A4 with 4:10's and it drinks gas on the highway. I might have to look into this.
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Old 08-07-2009, 11:10 PM   #4
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i have looked into it but i hear it eats up even more power over my TH400 and will add even more weight. things i dont want. but it would be nice to cruise on the highway.

i wonder how much it will drop the rpms?
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Old 08-08-2009, 08:40 AM   #5
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It eats 1hp per 400. So at the most I'll loose 2hp.
The bad thing is the weight, the unit weighs about 52lbs but you're replacing the tailshaft and cutting some driveshaft off, you're left with about a 35lb gain when it's all said and done. I think it's worth it though and it's supposed to help you ET better no the weight should be a non issue. We'll see.
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'98 Trans Am WS6 Cartek N/A (L92/LS7) Hydraulic roller 441 ci.
9.59 @ 138 1.30 60' - Best 60' 1.29 (new setup in the works)
video of 9.6x passes http://uk.youtube.com/watch?v=KVdBZk5Y3s4
**check out my TA in the Aug '09 issue of GMHTP magazine**
http://www.gmhightechperformance.com...ws6/index.html
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Old 08-08-2009, 09:09 AM   #6
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wow, that is extremely efficient. i am impressed. the weight stinks but hey, obviously, if you want to drive the car more on the street, you have to make compromises somewhere. awesome stuff.

looking forward to some results. what kind of reduction in highway rpm are we talking about? i am at 3500 rpms at 70 mph on my current combo.
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Old 08-08-2009, 10:20 AM   #7
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The guy at Gear Vendors told me I should drop 800 rpms in the overdrive setting on the highway.
I'm currently at 28-2900 rpms at 60 mph, I'm probably at 32-3300ish at 70 mph.
If I can get 70mph at 2500 rpms I'll do a backflip, hehe
At 2500rpms I can highway cruise on pump gas (maybe a little octane boost added) and enjoy the car more on further trips!!
Plus with my 8" N/A converter, the extra rpms from the OD on a moderate shot of nitrous should allow me to keep the converter the way it sits and leave me enough rpms to finish the run.
My goal now is to keep running my mid9 sec N/A times and just "sneak" into the 8's on a 150 shot. How cool would that be? Need about 850-900 horse at 3300lbs to get in the 8's if everything is working right so I'm really hoping when I get this combo together it will get me there, I'll "just" be making the hp needed so we'll see.
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'98 Trans Am WS6 Cartek N/A (L92/LS7) Hydraulic roller 441 ci.
9.59 @ 138 1.30 60' - Best 60' 1.29 (new setup in the works)
video of 9.6x passes http://uk.youtube.com/watch?v=KVdBZk5Y3s4
**check out my TA in the Aug '09 issue of GMHTP magazine**
http://www.gmhightechperformance.com...ws6/index.html
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Old 08-08-2009, 11:19 AM   #8
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How much did that unit set you back? I remember looking into it for my 72 454 chevelle, but that was about 5 years ago. IIRC it was 1500ish. Did they say how it will stand up to that power?
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Old 08-08-2009, 03:21 PM   #9
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Ive always wondered if they could hold the power of a car at the strip but I just thought due to the weight and hp loss it wouldnt be worth it. But if you only loose 1 hp per every 400hp thats awesome.
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Old 08-08-2009, 03:32 PM   #10
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Keep me posted as well.
I have been seriously debating dropping the loot on one of these!
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Old 08-08-2009, 07:09 PM   #11
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$2600

The standard unit holds 1200 hp and there is a free upgrade (some clips, fasteners) that will hold 1500 hp and more, that's the one I got, not that I need it. My th350 won't hold much more than it already does. If you ever decide to switch to a th400 or a glide they can transfer your unit to work with any trans. (cost like $500 to switch it).
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'98 Trans Am WS6 Cartek N/A (L92/LS7) Hydraulic roller 441 ci.
9.59 @ 138 1.30 60' - Best 60' 1.29 (new setup in the works)
video of 9.6x passes http://uk.youtube.com/watch?v=KVdBZk5Y3s4
**check out my TA in the Aug '09 issue of GMHTP magazine**
http://www.gmhightechperformance.com...ws6/index.html
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Old 08-08-2009, 07:54 PM   #12
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Here's a dumb question, why not just buy a built 4l80e for that price then?
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Old 08-08-2009, 08:35 PM   #13
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A built 4L80E (4L85E) made to handle 1000hp (the most hp I've seen one built for) is 8k.
That would be with an 11 inch converter which would absolutely KILL the car down low.
Plus you would have to clearance the tunnel, try and find a scattershield to fit it and not to mention all the extra weight over a th350 or 400 even with the GV on it.
Even new a good th350 or 400 built by a good company like Rossler hovers just north of 2k and you can buy a used one for around or just north of 1k so it's a no brainer IMO.
Not a dumb question, I had already looked into it so I had the same one.
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'98 Trans Am WS6 Cartek N/A (L92/LS7) Hydraulic roller 441 ci.
9.59 @ 138 1.30 60' - Best 60' 1.29 (new setup in the works)
video of 9.6x passes http://uk.youtube.com/watch?v=KVdBZk5Y3s4
**check out my TA in the Aug '09 issue of GMHTP magazine**
http://www.gmhightechperformance.com...ws6/index.html
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Old 08-08-2009, 09:32 PM   #14
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I seen some built 80e's going for around 2600. They weren't "made" to hand the 1000rwhp, but I'm sure they would work. I know MM is rockin the 80e with over 1000rwhp
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Old 08-08-2009, 10:42 PM   #15
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No ****? The one's I saw were much more $$$$$$$$
My buddy Mike has one in his C5 and he makes around 1000hp, maybe more, not totally w/o issues but at 1000+hp that's no surprise.
If anyone can make it work its MM.
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'98 Trans Am WS6 Cartek N/A (L92/LS7) Hydraulic roller 441 ci.
9.59 @ 138 1.30 60' - Best 60' 1.29 (new setup in the works)
video of 9.6x passes http://uk.youtube.com/watch?v=KVdBZk5Y3s4
**check out my TA in the Aug '09 issue of GMHTP magazine**
http://www.gmhightechperformance.com...ws6/index.html
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Old 08-09-2009, 09:09 AM   #16
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Did you ask Gear Vendors if that would actually fit in your car? There was a guy on another board 6-7 years ago that tried to put one in his 3rd gen and gave up. EXTENSIVE modifications necessary to the floorpan. He tried the BFH mod, and nearly destroyed the pan. Still didn't fit. I believe he ended up cutting out the pan and welded in a new pan, but the center console no longer fit and he had to fabricate new seat brackets. When he went to fully assemble the rest of the car he found out about the torque arm issue and scrapped the whole project.
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Old 08-09-2009, 09:38 AM   #17
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I asked the guy specifically and he said it would fit with no tunnel monifications.
Stock torque arm location will not work but mine is long since relocated. No mods to the trans crossmember either.
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'98 Trans Am WS6 Cartek N/A (L92/LS7) Hydraulic roller 441 ci.
9.59 @ 138 1.30 60' - Best 60' 1.29 (new setup in the works)
video of 9.6x passes http://uk.youtube.com/watch?v=KVdBZk5Y3s4
**check out my TA in the Aug '09 issue of GMHTP magazine**
http://www.gmhightechperformance.com...ws6/index.html

Last edited by tektrans; 08-09-2009 at 09:39 AM.. Reason: mistake
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Old 08-10-2009, 10:11 AM   #18
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Keep us updated with pictures and comments.
I just wonder how hard it will be to shift all 6 gears going down the track.
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Old 08-10-2009, 02:04 PM   #19
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Quote:
Originally Posted by tektrans View Post
No ****? The one's I saw were much more $$$$$$$$
My buddy Mike has one in his C5 and he makes around 1000hp, maybe more, not totally w/o issues but at 1000+hp that's no surprise.
If anyone can make it work its MM.
Thats why you think they are so high in price.....the C5 swap. A friend of mine just built a FMVB 4L80 built for 1200rwhp.....it was way less than 8K.
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Old 08-10-2009, 02:44 PM   #20
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the price I saw was for the unit. what size converter? simple th350 or 400 is still going to be lighter, easier to install and more reliable with more of a choice for converters no?
Not saying a 4L80 stuffed into an f body isn't cool as ****, just not the way I wanted to go.
I'm still interested in what your friend payed for the L80, try and find out.
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'98 Trans Am WS6 Cartek N/A (L92/LS7) Hydraulic roller 441 ci.
9.59 @ 138 1.30 60' - Best 60' 1.29 (new setup in the works)
video of 9.6x passes http://uk.youtube.com/watch?v=KVdBZk5Y3s4
**check out my TA in the Aug '09 issue of GMHTP magazine**
http://www.gmhightechperformance.com...ws6/index.html
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Old 08-10-2009, 02:44 PM
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