Towing Dog up hill
#16
Well your bound to do this after hearing most of the detail against it, so here is the last bit you might want to know.
With stock 3.55 rear gear in over drive, the final ratio is 3.55 x .70 = 2.49 rounded off.
With 4.56 x .7 = 3.19 rounded off.
There is only .70 difference between the two ratios in over drive.
In all other gears the difference is
First gear stock = 2.84 x 3.55 = 10.03 vs 2.85 x 4.56 = 12.95.
Second gear stock= 1.55 x 3.55 = 5.50 vs 1.55 x 4.56 = 7.07.
High gear is 1 x 3.55 or 3.55 vs 1 x 4.56 or 4.56.
OD is .7 x the final ratio as above.
You will have to rev the motor to 3500 rpm to get its max torque in any gear ratio.
.
This torque us mechanically multiplied by the final gear ratios in each gear.
Engine torque is what moves the weight. Changing gears does not generate more horse power
If the final torque total is less than the motor can pull 'reasonably', the trans is in danger of ballooning the converter as it will be out of lockup most all the time when towing the total load plus the tremendous heat generated over the pull time.
There are very few that get this level of analysis to show the likely real time conditions for your application.
Good luck.
With stock 3.55 rear gear in over drive, the final ratio is 3.55 x .70 = 2.49 rounded off.
With 4.56 x .7 = 3.19 rounded off.
There is only .70 difference between the two ratios in over drive.
In all other gears the difference is
First gear stock = 2.84 x 3.55 = 10.03 vs 2.85 x 4.56 = 12.95.
Second gear stock= 1.55 x 3.55 = 5.50 vs 1.55 x 4.56 = 7.07.
High gear is 1 x 3.55 or 3.55 vs 1 x 4.56 or 4.56.
OD is .7 x the final ratio as above.
You will have to rev the motor to 3500 rpm to get its max torque in any gear ratio.
.
This torque us mechanically multiplied by the final gear ratios in each gear.
Engine torque is what moves the weight. Changing gears does not generate more horse power
If the final torque total is less than the motor can pull 'reasonably', the trans is in danger of ballooning the converter as it will be out of lockup most all the time when towing the total load plus the tremendous heat generated over the pull time.
There are very few that get this level of analysis to show the likely real time conditions for your application.
Good luck.
Last edited by Bluegrass; 11-16-2017 at 02:13 AM.
#17
#18
#19
Please help me understand from Randy’s ring and pinion www.ringpinion.com To me it appears I would be within the perimeters to benefit from this mod. If you saw this low mileage second owner maintained truck you would see why I am hanging on to it.
#20
#22
Brakes
No worries on the brakes the trailer has its own breaks you don’t even know it’s back there when stopping at help stop the truck by itself. The weight distribution bar makes it to where there is no weight on the tongue either so there’s no bouncing. Just doesn’t pull Hills very well it pulls them. just very slow
#24
Just an update. I did the 356 to 456 gear change and after break in I am happy to say it can now tow the trailer like nothing and even better I can pass cars on the highway like never before! It cruises at 80 mph with ease and get this. My gas mileage went up noticeably probably because I don’t have to floor it anymore. Anyone considering this swap will be pleased if they can do it. The cost was about 1600 plus the speedo calibration. Happy hills tp me!
thanks to everyone who helped me make my decision.
mike
thanks to everyone who helped me make my decision.
mike
#25
#26
Glad you are going 80 mph presumably towing a 30' TT??
I don't think anyone 'helped' you with this decision, but if you are happy with it, that's all that can be said..
Changing your rear gears DOES help multiply the amount of torque getting to the ground at the wheels, so what you are seeing in better towing performance is expected..
All I can say is good luck and happy camping..
Mitch
I don't think anyone 'helped' you with this decision, but if you are happy with it, that's all that can be said..
Changing your rear gears DOES help multiply the amount of torque getting to the ground at the wheels, so what you are seeing in better towing performance is expected..
All I can say is good luck and happy camping..
Mitch
#27
#29
#30
356-456
I know right?! I can pass on the highway now. The trailer that was too heavy is now an easy safe pull. I cruise at 80 just like before and my gas mileage is noticeably better. I barely have to touch the pedal and it goes! This thing was a dead dog and now it gets up and goes. I am so happy with this decision. I no longer need a new truck. Wanna race anyone?