Regearing questions (ratio, brand, rpms etc)

[TEXAS]

Hi, my 09 RAM 2wd Hemi has a 3.21 erst end, unfortunately....at leat with a Detroit trutrac. It shifts up and down like crazy. In addition the mds kicks in pretty fast. That is pretty annoying. i am reading the regear threads in our forum for a couple of weeks Now but still have some questions.
I am thinking about upgrading to 3.92 gears (no towing or offroading). 4.10 cost Way more. In case of mopar even duoble price.
So here are the first questions:

-will this Upgrade be a really noticeble difference or rather not? I don't wanna spend 1.5k $ or so die "nothing".

-i heared some gears are noisy/whining. Should i go with mopar to avoid it? Meaning is there a difference in quality between the Brands/which brand should i go with? The prices vary pretty much.

-besides the fact that 4.10 cost twice as much: i am afraid 4.10 might be a little too much for daily driving (freeway/highway). What do you think? The r/t has a 4.10 rear end, i believe.

Thx a lot for your help guys

 

[TEXAS]

Ah...i ride 275/65 20 mt's (34,5")

 

[Pull Ya]

You will see a lot of difference between the 3.21's and the 3.92's. I would suggest you get Mopar gears and an install kit from Moe's Performance. I think the cost of the OEM gears just recently went up---a lot. The nosier gears are usually 4.56, 4.88, and 5.13. If your 3.92's are set up right you shouldn't have any rear end noise.
Jay

 

[RLJ10X]

Tex, you can see my set up in my sig below.

IMHO, the 545RFE should all came with 4.10s.

I’m 99% sure you’ll love 4.10s. The driving enjoyment far exceeds any MPG hit, which is next to nothing. Some guys say they do better on 4.10 s. I can’t tell a difference.

If I had to go back to 3.55s. I’d sell my truck. 3.21s would be torture.

 

[Matts175]

I have 3.92s in this truck and had a 3.92 in my old 2003 4.7 Ram, which was 2wd. Seems like the perfect balance of "not too much and not too little" for these trucks. Since 4.10s cost so much more, I wouldn't even bother with those. The difference between 3.92 and 4.10 is going to be negligible as far as the butt dyno goes. Might be like a fender length in the quarter mile.

 

[RedSRT4Me]

Hi, my 09 RAM 2wd Hemi has a 3.21 erst end, unfortunately....at leat with a Detroit trutrac. It shifts up and down like crazy. In addition the mds kicks in pretty fast. That is pretty annoying. i am reading the regear threads in our forum for a couple of weeks Now but still have some questions.
I am thinking about upgrading to 3.92 gears (no towing or offroading). 4.10 cost Way more. In case of mopar even duoble price.
So here are the first questions:

-will this Upgrade be a really noticeble difference or rather not? I don't wanna spend 1.5k $ or so die "nothing".

-i heared some gears are noisy/whining. Should i go with mopar to avoid it? Meaning is there a difference in quality between the Brands/which brand should i go with? The prices vary pretty much.

-besides the fact that 4.10 cost twice as much: i am afraid 4.10 might be a little too much for daily driving (freeway/highway). What do you think? The r/t has a 4.10 rear end, i believe.

Thx a lot for your help guys

What size tire?

Lifted?

 

[RLJ10X]

Define "way more". Put a number on on that cost.

If you want to save money leave it alone. If you're going to do it, do it right.

4.10

 

[TEXAS]

@redSRT: tire size is 275/65 20 mt (34.5")

Ring and pinion are about 590 for the 3.92 and about 1050 die the 4.10. Plus the bearing kit. I guess i have to renew all bearings, right? I only found a master install kit from yukon for about 200. Dies mopar have such a kit, too? Which kit did you guys go with? I don't wanna pick each single bearing....i'd miss 2 or 3 for sure.

 

[tidefan1967]

So by those numbers you obviously have a two wheel drive truck right? If I had a 2 wheeler I would at least check around for used complete rearends with 3.92's just for the hell of it at any local junkyards. Thats something that just about anybody could install themselves with basic automotive knowledge and a little common sense.

 

[DodgeDude99]

Doesn’t the ‘09 still have the nothing fancy old school 9.25”?

You don’t have to go with Mopar. I buy my gears & install kits typically from either Randy’s ring & pinion or National Drivetrain.

It’s an fairly easy rear end to do an install on (except for the crush sleeve).
Randy’s wants $450 for 4.11s & $260 for install/overhaul kit.

 

[RLJ10X]

Tex, that is a substantial price difference.

Have you spoken to Matt @ Moe’s? I can’t say enough good things about Matt.

 

[TEXAS]

I contacted him a while ago...no answer,yet.
Changing the Complete axle would make me lose my Detroit truetrac.
how come some gears are 4.10 and others 4.11? I always thougt only one of them would fit the 9.25 rear end.
do you guys have/cold give me an idea of rpms with 3.92 and 4.10?

 

[RLJ10X]

I think in our case, it's 4.10..... I remember being a little confused by that also.

I his is a pic of my truck with 4.10s. At 55 mph, the engine is spinning aprox 1600 rpm. 4.10s are what the 545RFE should have come with. I believe the R/T used to come with 4.10s.

 

[Matts175]

I contacted him a while ago...no answer,yet.
Changing the Complete axle would make me lose my Detroit truetrac.
how come some gears are 4.10 and others 4.11? I always thougt only one of them would fit the 9.25 rear end.
do you guys have/cold give me an idea of rpms with 3.92 and 4.10?

https://spicerparts.com/calculators/engine-rpm-calculator

 

[TEXAS]

I think in our case, it's 4.10..... I remember being a little confused by that also.

I his is a pic of my truck with 4.10s. At 55 mph, the engine is spinning aprox 1600 rpm. 4.10s are what the 545RFE should have come with. I believe the R/T used to come with 4.10s.

View attachment 159516

What tire size are you running? Is mds on in that pic?

 

[RLJ10X]

275/70/18.

They’re real close to stock diameter.

I am a nonbeliever in MDS. I turned the MDS off with the Tune I have.

Give Matt another try. He is good!

 

[QwikKota]

Avoid Richmond gears, they are generally loud/noisy. I have had good luck with Yukon gears and obviously OEM as far as noise goes.

 

[TEXAS]

choosing tj

Avoid Richmond gears, they are generally loud/noisy. I have had good luck with Yukon gears and obviously OEM as far as noise goes.

Choosing the right brand is hard. especially since this will determine which ratio i'll go with. If i take mopar i can't go over 3.92 because of the price. I'd like to go with 4.10, too. But i am afraid of lower quality

 

[TEXAS]

....and regretting it down the road. What do you think/recommend? Maybe there is no real difference between those two ratios?? I mean in terms of oomph off the line

 

[Wahrsuul]

I'm with DodgeDude99 - look for a 3.92 rear end and install in yourself. I have the 3.55 in mine, and when the wife was wanting a travel trailer, I was thinking of re-gearing for the extra tow weight. I can swap a rear end myself, but I wouldn't attempt gears. Personally I don't think you'd see much difference between 3.92 and 4.10.