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Old 09-29-2015, 06:55 PM   #31
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Yes. A friend had one on his Street Rod. 383 stroker, ran at the drag strip and drove car around the country. no problems. Turbo 400 trans. Removed tail housing, bolted on adapter, attached gear venders over/under, then had drive shaft shortened. This could be a plus if you have a two piece drive shaft. you could go to a one piece then.
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Old 09-29-2015, 06:58 PM   #32
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I have tossed around the idea of putting one in my 2012 SunSeeker. that would give me 10 forward speeds forward and easier on engine climbing mountains/ very large hills.
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Old 09-29-2015, 08:07 PM   #33
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Hmmm. I dunno. 3k for the added trans adapter..... Put that with the current tow value.... You might buy a decent truck. JMO


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Old 09-29-2015, 08:14 PM   #34
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Gear Vendors does not automatically give you a bunch of forward speeds... you have to crunch the numbers and see if the resulting ratios are different. I had an overdrive like this once and gears ran 1-2-2od-3-4-4od because 3od was about 0.01 different than 4th and just not worth the effort.

You can put in all the gears you want but if you don't got the torque you just are not going to get anything done. When it is all said and done it is torque moving you up the hill and you are only going to move as fast as you have the torque to make you go.
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Old 09-29-2015, 09:27 PM   #35
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Gear Vendors does not automatically give you a bunch of forward speeds... you have to crunch the numbers and see if the resulting ratios are different. I had an overdrive like this once and gears ran 1-2-2od-3-4-4od because 3od was about 0.01 different than 4th and just not worth the effort.

You can put in all the gears you want but if you don't got the torque you just are not going to get anything done. When it is all said and done it is torque moving you up the hill and you are only going to move as fast as you have the torque to make you go.
Good point S, like many have said it is torque that is missing and there is no substitute. You are wanting to pull a grade at a particular speed that might not be realistic. I messed around with some numbers... these are estimates only.

Lowering the gear to 3:73 is about an 8% change
4:10 around 16% change in RPM.

At 60 MPH you might now be turning 1700 rpm with stock gears
3:73 will get you about 1836 rpm
4:10 will get you about 1972 rpm

You essentially would be turning about what you now do in third (assuming a 4 speed) but be in 4th.

What you get is with change, the gears are closer, so the RPM drop of increase in a gear change is less. This will keep the RPM more constant and like someone said, get it moving easier from stop.

I guess your MPG will suffer about 4% worse with the 3:73 and 8% with the 4:10.

The cost of changing the gear set, isn't going to get you any more for the Burb when you sell it.
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Old 09-29-2015, 09:28 PM   #36
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I ran a GearVendors unit on my 87 F350 crew cab diesel.
First you do not gain another speed in reverse. Actually if the unit was engaged and you backed up it would destroy the conical clutch inside because of a one-way clutch gear inside. This is how I got my unit so cheap and had to rebuild it.
Next, the only way this unit would benefit your scenario is if you also changed out the rear ring and pinion. On my setup I ran 4.56 in the rear and with the overdrive engaged it was like I had 3.73s.

For you I would recommend either a complete reused axle from a salvage yard that you can simply swap out one weekend and see if you like it. If not, swap back. You're only talking about 4 ubolts, 4 bolts for the ujoint, 2 bolts for the shocks, parking brake cable, and the one main rear brake hose. And of course swap the wheels and tires.

Or shop around (Randy's Ring & Pinion has it all and knowledgeable employees) pick up an install kit and a new ring and pinion set. Then have it installed by a driveline shop, not Joe Shmoe Muffler shop.


I prefer older vehicles, specially if it's a single purpose vehicle like a hauler so my advice is bias. Some people don't get there's many of us that resale value or age doesn't matter. As long as it's getting the job done and it brings a smile to my face, it doesn't matter it's 20 years old.

Whatever you choose, enjoy!
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Old 09-30-2015, 02:02 AM   #37
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My 05 Z-71 came with 3:42 gears and all I would tow is my tent trailer. When we decided to get a hard sided trailer I took my truck to a four wheel drive shop and have the gears changed to 4:10. Real big difference ,It tows so sweet,lots of power and at 60 mph the rpm is at 2600. At this rpm the oil pump in the trans has the plates locked up so there is no slippage.If I drive carefull I can get 16 - 17 on the freeway with out the trailer and with the trailer I get 10-11. The mechanic at the 4wd store is the best in the inland empire and he has been doing it for 40 yrs and he does not like synthetic oil, He says under heavy load and high heat It is too thin to provide a cushion between the metal. He recomends valvoline 80-140 GL-6 with a ford additive for the positraction. It kills me not to use synthetic oil but I trust what he says. It cost about 1000 per axel
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Old 09-30-2015, 12:04 PM   #38
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Unfortunately it's not as simple as just dropping down a gear in the transmission. The axle ratio effectively changes the ratios of all the gears in the trans. So each gear will be more efficient.
4.10's will really wake it up! Your towing and around town mileage will go up.

I went from 3.55-3.90 in my Dodge van and it made a huge difference in how well it towed!
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Old 09-30-2015, 12:34 PM   #39
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...Your towing and around town mileage will go up...
Mileage will definitely GO DOWN with 4.10 gears as opposed to 3.55. The higher the gear number, the lower the fuel mileage will be.
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Old 09-30-2015, 01:40 PM   #40
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Mileage will definitely GO DOWN with 4.10 gears as opposed to 3.55. The higher the gear number, the lower the fuel mileage will be.

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