Max Trailer Tow Package
Senior User
Joined: Mar 2006
Posts: 145
Likes: 0
"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!
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!
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.
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.
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.
Fleet Mechanic
Joined: Aug 2006
Posts: 1,684
Likes: 0
From: Phoenix, AZ
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...
Laughing Gas
Joined: Jun 2006
Posts: 951
Likes: 7
From: So Cal
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.
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