Gears
Gears
My 1970 W-100 has 4.10 gears. I have been driving it a lot more recently and further distance. I am nearing the end of my patience with the low gears and have 33 x 9.5 tires already. Has a freshish 360 four barrel so plenty of power, I dont pull trailers or haul super heavy loads.
What is the tallest gear set that is not a total highway gear? And is changing gears in my Dana 44 front possible? The rear 8.75 I can handle.
Thanks all
jim
What is the tallest gear set that is not a total highway gear? And is changing gears in my Dana 44 front possible? The rear 8.75 I can handle.
Thanks all
jim
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- Sweptline.ORG Member
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Re: Gears
3.23's seem popular as do 3.55's.
What about switching to a 5 speed tranny and keeping your gears?
What about switching to a 5 speed tranny and keeping your gears?
- powerwagon54
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Re: Gears
5 speed trans is not going to change anything. 5th gear is direct and so the high speed stays the same. Unless you can find an overdrive.
- WD
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Re: Gears
3.73 is about as high as I would consider. You can run a 3.54/55, but a 33" tire is right at the limits for that high of a gear.
I have worn out LT285/75R16D ATs on my 4wd right now, 330hp at the crank, 2 speed automatic and locker equipped 4.10s. Top speed is 60 mph (would peg the needle before 3rd and 4th failed).
I have worn out LT235/75R15D ATs on my Swept. 210hp at the crank, 3 speed auto and open 3.55s. Top speed is 60 mph, downhill, with a strong tail wind and the throttle to the frame rail.
I have barely worn 6.00-16 4 ply street rib bias on my Pilot House. 90hp at the crank (218 flattie), 3 spd top loader and open 4.78s. Top speed (new) was 54 mph.
Call Yukon Gear or similar and tell them what you are running. Engine, transmission, t-case, what axles with what gearing, tire size-load rating-tread, and primary usage of the truck. Let their calculator do the work optimizing what ratio you actually need.
I have worn out LT285/75R16D ATs on my 4wd right now, 330hp at the crank, 2 speed automatic and locker equipped 4.10s. Top speed is 60 mph (would peg the needle before 3rd and 4th failed).
I have worn out LT235/75R15D ATs on my Swept. 210hp at the crank, 3 speed auto and open 3.55s. Top speed is 60 mph, downhill, with a strong tail wind and the throttle to the frame rail.
I have barely worn 6.00-16 4 ply street rib bias on my Pilot House. 90hp at the crank (218 flattie), 3 spd top loader and open 4.78s. Top speed (new) was 54 mph.
Call Yukon Gear or similar and tell them what you are running. Engine, transmission, t-case, what axles with what gearing, tire size-load rating-tread, and primary usage of the truck. Let their calculator do the work optimizing what ratio you actually need.
If I didn't build it, it ain't mine.
1949 Dodge B1B-108; 1969 D100-128; 72 Super Beetle; and a bunch of others...
1949 Dodge B1B-108; 1969 D100-128; 72 Super Beetle; and a bunch of others...
- marklein
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Re: Gears
What is the rpm at 60 mph? In theory it should only be running at 2500 rpm as it is. It would run about 2000 rpm at 60 with 3.23's, 2200 with 3.55's. 33's turn about 611 revolutions per mile, so use that number times the diff ratio to get theoretical rpm. It gives a general idea, but isn't 100 % correct, too many other variables. I would say that 3.55 would be the minimum, 3.73's are available, but not much under what you have at about 2300. Then figure out how much gas you can buy for what it will cost to change gears. Got room for 35's?
- swptln
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Re: Gears
What is your top speed?
I have 4.88's with 34's on my 68 W200 and she will run 65-70 with no problem, it's wound up pretty tight around 80-90, but it will go. She likes fuel though at highway speeds, I run 55-65 most of the time on the highway. If I want to pull out and pass, it goes with no hesitation. I've towed cars from MA to PA running 60-65 a number of times, hauled my slide in camper to VT, PA, NY with no problems driving on the highways. I was probably only getting 7-8 MPG which is expected towing vs 10 MPG off the highway empty.
If you can't get 80 mph out of a 360 with 4.10's and 33's you have something seriously wrong.
Stock 318, 2.5" dual exhaust, Walker mufflers, iron manifolds, iron intake, carter 2bbl, MP Electronic ignition, wide ratio NP435D3, 16" wheels w/LTB 34x10.50 super swampers.
http://www.sweptline.org/SweptlineRegis ... 2281820618
I have 4.88's with 34's on my 68 W200 and she will run 65-70 with no problem, it's wound up pretty tight around 80-90, but it will go. She likes fuel though at highway speeds, I run 55-65 most of the time on the highway. If I want to pull out and pass, it goes with no hesitation. I've towed cars from MA to PA running 60-65 a number of times, hauled my slide in camper to VT, PA, NY with no problems driving on the highways. I was probably only getting 7-8 MPG which is expected towing vs 10 MPG off the highway empty.
If you can't get 80 mph out of a 360 with 4.10's and 33's you have something seriously wrong.
Stock 318, 2.5" dual exhaust, Walker mufflers, iron manifolds, iron intake, carter 2bbl, MP Electronic ignition, wide ratio NP435D3, 16" wheels w/LTB 34x10.50 super swampers.
http://www.sweptline.org/SweptlineRegis ... 2281820618
Mark D.
61-71 Dodge Truck Association
http://www.sweptlinesunlimited.com
1968 W200 Sweptline
1969 D100 Utiline
1993 D250 Club Cab
61-71 Dodge Truck Association
http://www.sweptlinesunlimited.com
1968 W200 Sweptline
1969 D100 Utiline
1993 D250 Club Cab
- swptln
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Re: Gears
Jim, it doesn't make much difference, 4th gear in a 435 is 1:1 ratio as is 3rd gear in a 727. So, your rpms will be the same, your shift points are the only difference.
As mentioned I wouldn't drop your ratio to 3.23's with 33" tires, it will be gutless on the bottom end.
Personally, the lowest I would go is 3:91's with 33's, but I love my 4.88's and 34's combo.
Don't be scared let her rev a little
As mentioned I wouldn't drop your ratio to 3.23's with 33" tires, it will be gutless on the bottom end.
Personally, the lowest I would go is 3:91's with 33's, but I love my 4.88's and 34's combo.
Don't be scared let her rev a little
Mark D.
61-71 Dodge Truck Association
http://www.sweptlinesunlimited.com
1968 W200 Sweptline
1969 D100 Utiline
1993 D250 Club Cab
61-71 Dodge Truck Association
http://www.sweptlinesunlimited.com
1968 W200 Sweptline
1969 D100 Utiline
1993 D250 Club Cab