warblazer4x4
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Does any one know of another differental that will fit in the 86 m1009 that is geared a little higher
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M1009 Differential
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mangus580
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Higher? or do you mean Lower?
The 1009 uses the GM 10bolt axle.... they are a dime a dozen. You shouldnt have a hard time finding some 3.42 or 3.73 gears. I would suggest 3.42's if you are keeping the stock transmission, and 3.73's for with Overdrive.
The 1009 uses the GM 10bolt axle.... they are a dime a dozen. You shouldnt have a hard time finding some 3.42 or 3.73 gears. I would suggest 3.42's if you are keeping the stock transmission, and 3.73's for with Overdrive.
warblazer4x4
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i need higher, mine has a few aftermarket additions making the millage poor so i need higher
mangus580
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What have you done to it? I seriously doubt going to higher (ie smaller # than 3.0
is going to help you mileage at all.
is going to help you mileage at all.
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enything less then 3.42s will put a serious strain on trans and motor
warblazer4x4
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ok thank you
mangus580
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Re: RE: M1009 Differential
If you have lifted, and put bigger tires on it, I would suggest 3.73 or 4.10. It all depends on what you have done to it. Bigger tires effectivly make the gearing even higher yet. Putting more strain on the motor, and IMO causing worse fuel mileage.
Hence the problem with the stock 3.08's73m819 said:
If you have lifted, and put bigger tires on it, I would suggest 3.73 or 4.10. It all depends on what you have done to it. Bigger tires effectivly make the gearing even higher yet. Putting more strain on the motor, and IMO causing worse fuel mileage.
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RE: Re: RE: M1009 Differential
about the only time 3.08s or 3.42s are realy usefull for straight road driving, no off road, as mike said with big tires a 3.08 would really work a auto trans and engine, wilh big tires i would not go below 3.73 if any off roading is going to happen, still will be a strain
about the only time 3.08s or 3.42s are realy usefull for straight road driving, no off road, as mike said with big tires a 3.08 would really work a auto trans and engine, wilh big tires i would not go below 3.73 if any off roading is going to happen, still will be a strain
warblazer4x4
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RE: Re: RE: M1009 Differential
the lift is a 3 inch but the tires are stock 31's would bigger tires help or are there any otherways to help fuel economy?
the lift is a 3 inch but the tires are stock 31's would bigger tires help or are there any otherways to help fuel economy?
mangus580
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RE: Re: RE: M1009 Differential
I would say for 31-33" tires, you would be ok with 3.42 but 3.73 might give you similiar mileage, with better performance. If you go bigger than 33" tires, I would go 3.73 or 4.10's.
HTH
I would say for 31-33" tires, you would be ok with 3.42 but 3.73 might give you similiar mileage, with better performance. If you go bigger than 33" tires, I would go 3.73 or 4.10's.
HTH
acetomatoco
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RE: Re: RE: M1009 Differential
The M1009 has one of the lowest numerical gear sets available... To get better mileage you need to put in an overdrive and take out everything in the truck which is heavy and is doing nothing to help you as creature comforts... go slow....put nice radial street tires on it and never put it in 4wd... If you want good mileage... get a Prius....
The M1009 has one of the lowest numerical gear sets available... To get better mileage you need to put in an overdrive and take out everything in the truck which is heavy and is doing nothing to help you as creature comforts... go slow....put nice radial street tires on it and never put it in 4wd... If you want good mileage... get a Prius....
JohnFire
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RE: Re: RE: M1009 Differential
I am waiting on a smart car. I have seen those when I was stationed in germany, and watched quite a few crash tests on them. Surprisingly they hold up for a little little toy car. Seen a SUV that I have taken the door off with my bare (gloved)hands after an accident. The whole door fell apart. Made patient extrication pretty easy.
I am waiting on a smart car. I have seen those when I was stationed in germany, and watched quite a few crash tests on them. Surprisingly they hold up for a little little toy car. Seen a SUV that I have taken the door off with my bare (gloved)hands after an accident. The whole door fell apart. Made patient extrication pretty easy.
mangus580
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RE: Re: RE: M1009 Differential
Mileage isnt all about lower gear numbers (higher ratios). You need to keep in mind that your engine wants to run at an optimal RPM.
Take my 1009 for instance. I have stock 3.08 gears still, and the 700R4 transmission. At 65mph, I am running 1524 RPM. When I finally switch to 3.73 gears, I will be running 1839 RPM.
Now, the optimal Torque/HP combo in the 6.2 engine occurs in the 1800-1900 RPM range. This is where your ideal engine conditions are, such that if it were setup for constant speed for a pump or something of that type of use, it would be set to run at that RPM. This is where you will get the best mileage under a 'load'.
I do agree, that it is possible under certain conditions, that the 1500 RPM might produce a better mileage (nice flat expressway), but how many of us routinely drive just that?
Now lets talk in terms of the stock tranny, since thats what most 1009 owners have.
With the stock 3.08 gears, at 65mph, you are turning roughly 2300 RPM. With 3.73's it will be 2776. In order to match the final drive ratio of the overdrive tranny even with the 3.73's you would have to go down to a 2.59.
I had set out writing this with the intention of proving a gear change is warrented in the 1009. What it seems I have done, is really a tranny change is needed followed by a gear change (incidentally, I was already headed on this path). The problem with just 3.08 gears and the stock tranny, is you dont have enough gears in the transmission to have the 'power' you want for every day driving.
For a great site for running all these #'s go to http://www.grimmjeeper.com/gears.html
They dont list the 3.08 gears, but for all practical purposes the 3.09 is the same. The 1009 has a TH400 transmission stock, and the overdrive I have installed is the TH700R4. The transfer case is a NP208.
Glad to answer any more questions...
Mileage isnt all about lower gear numbers (higher ratios). You need to keep in mind that your engine wants to run at an optimal RPM.
Take my 1009 for instance. I have stock 3.08 gears still, and the 700R4 transmission. At 65mph, I am running 1524 RPM. When I finally switch to 3.73 gears, I will be running 1839 RPM.
Now, the optimal Torque/HP combo in the 6.2 engine occurs in the 1800-1900 RPM range. This is where your ideal engine conditions are, such that if it were setup for constant speed for a pump or something of that type of use, it would be set to run at that RPM. This is where you will get the best mileage under a 'load'.
I do agree, that it is possible under certain conditions, that the 1500 RPM might produce a better mileage (nice flat expressway), but how many of us routinely drive just that?
Now lets talk in terms of the stock tranny, since thats what most 1009 owners have.
With the stock 3.08 gears, at 65mph, you are turning roughly 2300 RPM. With 3.73's it will be 2776. In order to match the final drive ratio of the overdrive tranny even with the 3.73's you would have to go down to a 2.59.
I had set out writing this with the intention of proving a gear change is warrented in the 1009. What it seems I have done, is really a tranny change is needed followed by a gear change (incidentally, I was already headed on this path). The problem with just 3.08 gears and the stock tranny, is you dont have enough gears in the transmission to have the 'power' you want for every day driving.
For a great site for running all these #'s go to http://www.grimmjeeper.com/gears.html
They dont list the 3.08 gears, but for all practical purposes the 3.09 is the same. The 1009 has a TH400 transmission stock, and the overdrive I have installed is the TH700R4. The transfer case is a NP208.
Glad to answer any more questions...
georiga4x4
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RE: Re: RE: M1009 Differential
if u drive stop and go trafic like i do go with all stock with 35's you will have sugnificant fuel economy, may require triming of fenders or flares but well worth it
if u drive stop and go trafic like i do go with all stock with 35's you will have sugnificant fuel economy, may require triming of fenders or flares but well worth it
georiga4x4
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RE: Re: RE: M1009 Differential
now keep in mind if its city traffic not highway you need the tranny adjusted, i live in atlanta were its always stop ang go so i hardly get over 25 and was originaly getting verry bad fuel economy, (12, 14, mpg) I had my buddy adjust the transmisson so it would go in to third at 37 this paired with my 35's worked realy well and i later got about 16-18 city mpg.
now keep in mind if its city traffic not highway you need the tranny adjusted, i live in atlanta were its always stop ang go so i hardly get over 25 and was originaly getting verry bad fuel economy, (12, 14, mpg) I had my buddy adjust the transmisson so it would go in to third at 37 this paired with my 35's worked realy well and i later got about 16-18 city mpg.