Max Trailer Tow Package

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May 29, 2008 | 12:00 PM

#16

ffdemoss

Senior User

Joined: Mar 2006

Posts: 145

Likes: 0

Quote:

Originally Posted by supeRobertduty

"So lower gears do not always mean a weaker gear"

WRONG ! it's not the number of teeth it's the size! but ok you win , Lower gears are no weaker. 5.71 toyota gears are just as stong as 5.71 gears in a 2.5 ton rockwell axle. I have been involved in the auto/off road bizz all my life. I set up gears,sold,been involved with the warranty side from venders,And saw thousands of broken low ratio gear set's that (precision gear) or any company will not warranty.
thats 25 plus years at 2 MAJOR 4x4 shops.

I don't take any of this stuff personal. I have many,many years under my belt and know the true answers. I like to try and share the thing's I picked up over the years from watching know it all customers like you spend money on parts they read about in a magazine. But hey we all are getting a good laugh about your idea's on axle's.

p.s : The reason all off road guy's use a super low trasfer case gear, (4:1) is because the diff's would be so week and be useless. So they keep taller gears in the axles and lower it in the t-case. DUH!

Of course Toyota's are weaker than Rockwell's. To clarify, I am stating that two pinions for the same axle wwith the same number of teeth but combined with a diferent ring gear are at least equally as strong. I'm not stating that gear ratios in diferent axles are the same strength. It's great you have all this experience but I think we are arguing two different points. I am arguing the specific axles in the 2009 F150 HD package were changed for fuel economy and the new transmission, not strength.

May 29, 2008 | 01:21 PM

#17

supeRobertduty

Laughing Gas

Joined: Jun 2006

Posts: 951

Likes: 7

From: So Cal

Yea Ok ,
Sure,Thanks,No problem, Cash or Check?
NEXT !

May 29, 2008 | 02:35 PM

#18

ffdemoss

Senior User

Joined: Mar 2006

Posts: 145

Likes: 0

Quote:

Originally Posted by supeRobertduty

Yea Ok ,
Sure,Thanks,No problem, Cash or Check?
NEXT !

Your welcome.

Jun 11, 2008 | 11:17 AM

#19

supeRobertduty

Laughing Gas

Joined: Jun 2006

Posts: 951

Likes: 7

From: So Cal

The new2009 GM 1/2 ton get's the 6.2 400h.p motor.
But you can only get a 3.42 axle ratio and NOT the 3.73 or 4.10 because the weak rear axle will not hold up to the higher H.P.

This is just another example of getting more from less and saving money, instead of putting in a power matched specific axle and making a tow monster.

Jun 11, 2008 | 12:49 PM

#20

brownja

Junior User

Joined: Sep 2007

Posts: 50

Likes: 0

In the V-10 a while ago, someone posted pics of the 3.73 and the 4.10 pinion gears. The 3.73 was MUCH stouter looking.

Jun 11, 2008 | 02:08 PM

#21

Ryan50hrl

Post Fiend

Joined: Nov 2001

Posts: 7,698

Likes: 4

From: Neenah, Wisconsin

a 3.73 pinion gear will always look bigger than a 4.10 pinion gear...thats just the way gears work. Which is stronger is a matter for debate, some will say that a 4.10 is a weaker rear axle....while others will debate that. Total gear ratio is really all that matters....axle times tranny gears get you the true gear ratio that you should care about for towing performance.

Jun 11, 2008 | 08:25 PM

#22

Fosters

Fleet Mechanic

Joined: Aug 2006

Posts: 1,684

Likes: 0

From: Phoenix, AZ

Quote:

Originally Posted by brownja

In the V-10 a while ago, someone posted pics of the 3.73 and the 4.10 pinion gears. The 3.73 was MUCH stouter looking.

the pinion, prolly. but if they showed the ring gear, i'm willing to bet it was the exact opposite.

it ain't rocket science, you have say, 4 inches between the center of the pinion and the edge of the diff that the ring gear is bolted to. the larger the pinion, the smaller the ring gear, the smaller the ratio. the smaller the pinion, the larger the ring gear, and the larger the ratio.

on my stang, i had to grind the wrist pin to make it fit into the diff w/ 4.30s because the ring gear is so much bigger than the stock 3.55s. and yes, the pinion is much smaller on the 4.30s...

Jun 13, 2008 | 03:22 PM

#23

supeRobertduty

Laughing Gas

Joined: Jun 2006

Posts: 951

Likes: 7

From: So Cal

Quote:

Originally Posted by Ryan50hrl

a 3.73 pinion gear will always look bigger than a 4.10 pinion gear...thats just the way gears work. "Which is stronger is a matter for debate.

Maybe this is a debate for you and a few people on the boards but the rest of the World all ready gets it.
Please read this aticle:Jeep Tech: Axles

This is a from above :Why are High R&P Gears Stronger than Low R&P Gears?

The reason lower R&P gear sets are weaker than high R&P gear sets is that lower R&P gear sets use a smaller pinion. A differential housing for an axle can only handle a ring gear so large, so in order to create lower ratios, the pinion must have fewer teeth. The fewer teeth the pinion has, the worse the pinion contact surface is in relation to the ring gear. You may never have had a problem with your Dana 35c with 3.07s, until you swapped in 4.56s. Your Jeep is doing great off-road, but you are breaking teeth. This is why sometimes it pays to do an axle swap.