Gearswap and LSD question - Central TX

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

S0CAL

US Marine Veteran
Supporting Member
Military
Joined
Feb 3, 2016
Posts
3,207
Reaction score
3,519
Location
The Lonestar State
Ram Year
2021 Limited Longhorn CTD HO DRW 4x4
Engine
Cummins 6.7L HO
Gearswap and LSD question

I am looking to do front/rear 3.55-->4.10 or 4.56 gear swap as well as drop in an LSD on my 2010 1500 4x4/5.7L daily driver. I have 305/55/R20 Nitto TG2s and a Hemifever 91 tune as well.

I have a couple questions.

Do I need to do a Torq converter with a specific stall with this gear change?

Will I throw a code, forcing myself to hit the dealer?

Anyone have either of these gear setups with similar tire size or could someone run the math? What RPMs will I be looking at on Texas highway speeds of 85 mph?

Thanks!
 
Last edited:
OP
OP
S0CAL

S0CAL

US Marine Veteran
Supporting Member
Military
Joined
Feb 3, 2016
Posts
3,207
Reaction score
3,519
Location
The Lonestar State
Ram Year
2021 Limited Longhorn CTD HO DRW 4x4
Engine
Cummins 6.7L HO
Retry...
 

DannyMK2

Senior Member
Joined
Mar 25, 2013
Posts
1,727
Reaction score
491
Location
Long Island, NY
Ram Year
2015 Power Wagon
Engine
6.4 Hemi
to answer your questions, no and no. there are a few online calculators that will allow you to input the gear ratio, tire size and o/d trans ratio (.67) to give your your rpm's at certain speeds.
 

HammerHead

USMC 0313
Joined
Feb 18, 2015
Posts
2,284
Reaction score
2,831
Location
Georgia/Florida
Ram Year
2019 4Runner
Engine
4.0
I am looking to do front/rear 3.55-->4.10 or 4.56 gear swap as well as drop in an LSD on my 2010 1500 4x4/5.7L daily driver. I have 305/55/R20 Nitto TG2s and a Hemifever 91 tune as well.

I have a couple questions.

Do I need to do a Torq converter with a specific stall with this gear change?

Will I throw a code, forcing myself to hit the dealer?

Anyone have either of these gear setups with similar tire size or could someone run the math? What RPMs will I be looking at on Texas highway speeds of 85 mph?

Thanks!

No torque converter required, no codes issues.
I went 355 open diff to 410 LSD with 305/50R20 and Love it. Highway RPM at 80MPH 2750rpm:favorites13:
 
OP
OP
S0CAL

S0CAL

US Marine Veteran
Supporting Member
Military
Joined
Feb 3, 2016
Posts
3,207
Reaction score
3,519
Location
The Lonestar State
Ram Year
2021 Limited Longhorn CTD HO DRW 4x4
Engine
Cummins 6.7L HO
S/F Hammerhead. 0311 for life.
 
Top