2.62 gear ratio

The first part of what you say is correct. But the second...um...kinda wrong. First off, you spec your truck with components that can handle the torque your going to be giving them. so no, your trans wont break. Secondly, as i an 2 others have said, if more torque is required in one spot, but less in another, it all multiply out. The only disadvantage is 1st not being low enough on a direct trans. but once your moving, it will do just as well. Show me real math that says a 2.63 cant pull a hill as well as a 3.7. If you can compensate with the trans it makes no difference. i mean you could get rid of the trans and put in a 40:1 dif. The truck would still get off the line. The trans is only so you can switch the ratios. OD makes no difference.

 

If i put a 2.64 truck in Od then yes it is like any other truck. But if you want to go 100 mph, 3.55 (similar to 3.7 with tall rubber) is not the spec you want. In your case it works because your od is so high. most are .73 and you say your trans is .62. If you had a .73 OD, your rpm would be to high to make that speed. At 2100 rpms your still to high. Yes you have the most HP, but your tourqe is shot at that RPM.

 

Ten pages to get anywhere near an answer to the guys question! A simple comparison between two ratios in what sounded like basically the same truck, and some egghead Einstein MF's spend the next week trying to show how much smarter they are than the rest of us. Telling him that it would work fine if he bought it and changed the engine, tranny, and put a sail on the roof, and a propeller on the front. But only if he got a signed and notarized permission slip from Kevin Rutherford.

 

First off, you spec your truck with components that can handle the torque your going to be giving them. so no, your trans wont break. You made my point, if it doesn't take more torque, why spec your truck for it. I don't know where your from but if you ever come through Louisiana let me know, I can get you a load and we'll still be friends when it's over, you talk to any one you know pulling heavy, they don't have 2.62 rears. after you get off the clutch and wheels are rolling all transmission are for the most part are equal. you can't pull a load up a hill as easy with 2.62 as 3.70, no matter what tranny you have. most tranny's have a gear close to what ever tranny you pick. Don't listen to me or anyone on here, get out there and do some real world trucking, iv'e been doing this since 1973 come get you a 100000lbs of beans out of the field with your tire's in the dirt up to the rims and if you get out tell me how your 2.62's work for that.

 

Rock hauler what part loose banana is Deridder in?

 

This statement shows you have no idea what torque really is. Or its relationship with horsepower. Here's a good clue, there's no such thing as "horsepower vs. torque". Torque by itself is a meaningless number and produces no work. You need to introduce time.

Yes it can with more gearing in the transmission. But you're right, that means the driveline sees more torque since it has less gearing on the differential. That's why it's very important to spec your truck properly. That's why 46k diffs don't allow 2.xx gear ratios. That's why you can't spec a 2.xx direct driveline with 80k+ weight (there are exceptions, volvo allows up to 110k with their I-shift). It has nothing to do with starting, you get the same overall gearing in the lowest gear as an overdrive setup. It has everything to do with the rear half of the tranny and driveshaft u-joints/pinions seeing too much torque on takeoff.

Like I've hammered over and over again:

A direct drive 10 speed with 2.62s has the same overall ratio in each gear as a "B" ratio overdrive 10 speed with 3.58s

So what does that mean? It takes off the same, if you have a set shift point RPM wise for the engine both trucks would shift at the exact same road speed, would downshift at the exact same road speed, would cruise at the exact same road speed.

You guys are stuck thinking more gearing = better starting and lower cruise speed. That's not always the case. It has only worked because most transmissions have the same or similar overdrive ratios. Once you introduce different overdrive ratios or directs, everything you understood about the rear ratio goes out the window. There's lots of direct drive transmissions nowadays when there used to be only one. There's also transmissions out there with a .85 final ratio. Speccing that tranny with 3.70s would be a mistake.

Rear gears are always the *LAST* thing that should be specced. You have to take into consideration the operation, which rear differential types would work (which may limit your gear choices), the transmission, tire size, vehicle cruise speed, and desired engine cruise speed. From all this you need to find out the minimum start gear ratio which may further limit transmission choices. I wouldn't want a 10 speed with a heavy haul operation, or Volvo's XE13 system (2.64 gears with an overdrive and engine cruise rpm of 1150 rpm).

You don't match the transmission to the rear gear, you match the rear gear to the transmission.

 

north of Lake Charles 18 mile from Tx state line

 

i said it would be fine as long as he confirms its a direct trans...but....others wont accept my answer that i know is correct (using math not wims)

 

more tourqe on one part, less on another...its all the same in the end. Thats the WHOLE ENTIRE POINT and why your wrong. the trans matter s just as much as the rearend. Untill you can prove my math wrong, your the one who is incorrect. Just like bigger tires make a 3.7 act like a 3.55, the trans can impact it to.

 

42 rock hauler I knew I had seen a sign for it at least I am bad to make a Lufkin, stonewall, Lake Charles circle I just couldn't place it.