Tiger Rag

Thinking about changing my .410 out to .355. My main reason is to lower the noise inside the cab. I don't really think it will make that big of a difference in fuel economy, although it shouldn't hurt and could help a little too. I'm just trying to reduce noise a bit.

Truck seems to have plenty of power and I don't think I'll have any towing issues witht the .355. I haven't towed 10k+ in quite a while now.

Where is best place to source the new rear end gearing?

Thanks for the help, Matt

Tiger Rag

Should have mentioned that rear end is a Dana 80. Truck is 4x4 so I'll need fronts as well.

Thanks, Matt

Diesel-Dan

.355 eh?! We going for the land speed record?! I know your truck has good low end...but man! haha...just razzing ya! Its 4.10 and 3.55. BUT for gears....i have had great experience with Randys Ring and Pinion. TOP NOTCH service!! I can't stress that enough! Prices aint bad...but thoes axles you are talking about are High Dollar!! But talk to them and they might be able to work something out for ya.....great install kits they have......

ALSO might want to scavange for some one that needs 4.10.....Hunter (Big Blue's roommate) Might need some....

You should see about 1-1.5 MPG differance at 70MPH....brings the motor back down to 2000 RPM at 70......lots more efficent.....my 2

dodgediesel4x4

Thanks for the info Dan, but I think my gears are gonna stay in my truck. My milage is crappy enough with this heavy truck, no need to make it any worse.

Tiger Rag

Dan, my bad, you are right, I meant 3.55. Thanks for the info. Been pulling all nighters nearly since Friday working on trucks. I just got my interior back in. I dynamatted the whole thing. Man am I beat. Going to bed now. Thanks again for the info, Matt

Diesel-Dan

No prob....man i would love to have the 4.10's if i was going to go bigger on tires.....but i think i am going to stick with my 305's...and the 3.55's work fine......just dont think it woudl work with the towing.......

ridofpwrstroke

I swapped from 3.55-4.10 with 35" bfg's. My mileage has gone down, I bet, at least 2-3 mpg. It is unbelieveable. Cruising down the hwy at 75 before I was hitting 7psi of boost, now it is 15psi. It pulls much better and that is why I did it. But now I AM going to get an overdrive unit. If you dont know how to re gear, get the overdrive unit. Essentially turn it into a 10 speed -5speed tranny or 12 speed -6speed tranny. I am saving for the us gear now. It will go in. I want the mileage back. I didnt think it would make much difference, but it does.

Tiger Rag

I know when I drove bigger trucks you could split the axle to give you double the amount of forward gears, but it sounds like this is transmission related. I know I'll be getting a South Bend clutch soon and doing something like you mention or swapping front and rear end gears at the same time would make sense. If you have the name of the product or a link, I'd love to check it out. I'd love to keep the 4.10 if I could gain a higher gear for highway driving. Thanks, Matt

Diesel-Dan

US Gear Overdrive Unit

Tiger Rag

Ouch, $2795 for the overdrive unit. Install not included with pretty major fabricating including drive shaft and floor pan by the installer. Don't think I can handle that. Back to plan A. Thanks for the idea though.

newriverSpecon

I went from 4.10 to 3.55. I would have went for 3.31 if the price wasn't so insane. They want $700 (almost 680 something) for the GEAR SET only (comes with install kit). They are a Dana only item.

I managed to find my 3.54 used. Well actuallt the where brand new and came out of an axle that someone sold the houseing seperately. I wanted to stay posi and purchased one that claimed it was 3.54. Didn't really look at it close when I got it, but when I set my carrier next to the new one it was the same thing. I ended up having to use the brand new open carrier/gear set.

Just try to see the items before you buy them. Also, if anyone needs a Dana 80 posi carrier I have two of them and one 4.10 gear set.

Randy

newriverSpecon

On the '99 I gained about .75 mpg with the gear change. I also did everything in my sig, except for the VA, BAHF, & Straight pipe at the same time. Who knows how much came from what.

We went from 285 BFG AT to the 315 Maxxis Mudders and had no change in milage. May have been some boost increase. It does coast less. It runs about 7-9 psi at 75. There was some power loss with the change but not enough to be an issue. BTW, we get just over 18MPG (hand calc).

Randy

TxDiesel007

You can expect

about 300 RPM or so difference with these gears. Here is my experience with both, 4.10 and 3.55, i had a ford IDI with 265 tires that would turn 2000 rpms at 60 MPH.. with the 4.10 rear. pullin sonvabuck, with a wicked take off, and acceleration, yet no top speed whatsoever.... My ram with the .355 rear, is just the opposite, well power and tq overcome wimpy gears too hehehehehehe.... regardless, it takes a little more to get going, and with .285 tires, it actually gets 2000 rpms at 70 mph.. which to me is perfect.

If you do alot of highway travel, id say 355 is way to go, if you tow alot, 355 works, but 410 is better. I have not ran stock tires on my truck, but my MPG is about 16-18 city, and 20-21 highway... so i dont complain...

Tx

timbeaux38

I know a guy that will drive to you to swap his 3.55's for your 4.10's .. Lemmie know if you want his info

TopEndDiesel

3.55 is alot better for all around driving i have 3.55 in one of my trucks and 4.10's in the other lets just say they both will have 3.55 very soon