Sponsored

5.13 with 33's

ericnewcom

Well-Known Member
First Name
Eric
Joined
Nov 14, 2022
Threads
1
Messages
47
Reaction score
50
Location
US
Vehicle(s)
2023 JTR MT
IIRC, the cams go from low to high lift mode around 27 or 2800 RPM. 5.13s, 33s, 6MT will have you at 2800+ tomorrow at 75mph. I'm not sure what impact that might have but just something I'd note and consider if I were you.
At 70/72 it's still at 30 psi. I don't typically cruise faster than that but the switch is near that speed. I'm close to my first full tank since my gear change and prior my best tank was 17.3 hand calculated. My display is currently showing 18.6. The display is typically .4 mpg off. So it appears my millage has gone up and I did change the gears with a tazer. I'd still like a lower 1st and reverse but its acceptable to me now with the 5.13s.
Sponsored

 

JTDay

Well-Known Member
First Name
Josh
Joined
Sep 19, 2021
Threads
14
Messages
358
Reaction score
422
Location
Georgia
Vehicle(s)
2022 Sport S
Occupation
EHS
At 70/72 it's still at 30 psi. I don't typically cruise faster than that but the switch is near that speed. I'm close to my first full tank since my gear change and prior my best tank was 17.3 hand calculated. My display is currently showing 18.6. The display is typically .4 mpg off. So it appears my millage has gone up and I did change the gears with a tazer. I'd still like a lower 1st and reverse but its acceptable to me now with the 5.13s.
I think you're talking about the oil pump at 3000rpm. I'm referring to the cams switching from low lift to high lift somewhere around 27 or 2800rpm. I have no idea if it's bad to ride the big lobe constantly or not but it's something I felt to mention.
 

ericnewcom

Well-Known Member
First Name
Eric
Joined
Nov 14, 2022
Threads
1
Messages
47
Reaction score
50
Location
US
Vehicle(s)
2023 JTR MT
I think you're talking about the oil pump at 3000rpm. I'm referring to the cams switching from low lift to high lift somewhere around 27 or 2800rpm. I have no idea if it's bad to ride the big lobe constantly or not but it's something I felt to mention.
Yeah I'm not sure either. Good info to bring up for sure. The way I see things though, I use them how I want / need to. If it fails I repair it / upgrade it. If it can't handle it how I use it, I replace it with something that can.
 

Advntrbound

Well-Known Member
First Name
Brian
Joined
Apr 14, 2022
Threads
49
Messages
490
Reaction score
613
Location
Nw Arkansas
Vehicle(s)
2020 Gladiator
Occupation
Firefighter/Paramedic
I would like to regear, but I'm on 35s with a MT and 3:73 gears. It moves just fine loaded down. I never use 6th gear though.
 

AustinL911

Well-Known Member
First Name
Austin
Joined
Jun 18, 2019
Threads
32
Messages
500
Reaction score
672
Location
Central Ohio
Vehicle(s)
2021 JTR 6MT
Occupation
Nurse
You'll certainly be aggressive with that combo. The MT NEEDS some serious gearing. Far more so than the AT.

Most folks run 4.88s with the 6MT/35s combo.
I bought 5.13s for my 6MT/35 truck (not yet installed), and that's also being quite aggressive. You'd be taking it a step beyond even that by only running 33s. I wouldn't discourage you. I say go for it.

I wanted to be able to run 80mph max in 6th gear without tipping over the 3k rpm threshold so as to avoid the 2nd stage of the oil pump. I rarely run 75, let alone 80.

I, too, run a cap on my JTR, and tow my SxS around on my tandem axle aluminum trailer. That's the exact reason I went deeper on gearing than most usually do. I can't wait to get mine installed along with the ACT clutch sitting next to it. It should be a whole new truck.
 

Sponsored

OP
OP

Dusty Rag

Active Member
First Name
Ryan
Joined
Jan 6, 2019
Threads
6
Messages
35
Reaction score
85
Location
Pittsburgh
Vehicle(s)
2022 Jeep Gladiator
You'll certainly be aggressive with that combo. The MT NEEDS some serious gearing. Far more so than the AT.

Most folks run 4.88s with the 6MT/35s combo.
I bought 5.13s for my 6MT/35 truck (not yet installed), and that's also being quite aggressive. You'd be taking it a step beyond even that by only running 33s. I wouldn't discourage you. I say go for it.

I wanted to be able to run 80mph max in 6th gear without tipping over the 3k rpm threshold so as to avoid the 2nd stage of the oil pump. I rarely run 75, let alone 80.

I, too, run a cap on my JTR, and tow my SxS around on my tandem axle aluminum trailer. That's the exact reason I went deeper on gearing than most usually do. I can't wait to get mine installed along with the ACT clutch sitting next to it. It should be a whole new truck.
I’d say we’re in the same boat then. At 80mph it would just hit 3k rpm with 5.13 and 33s in 6th. Seems perfect on paper to me and also still great with 35s. Let me know how it works out for ya after the install. I’m also very interested in chucking out the dual mass flywheel.
 
OP
OP

Dusty Rag

Active Member
First Name
Ryan
Joined
Jan 6, 2019
Threads
6
Messages
35
Reaction score
85
Location
Pittsburgh
Vehicle(s)
2022 Jeep Gladiator
IIRC, the cams go from low to high lift mode around 27 or 2800 RPM. 5.13s, 33s, 6MT will have you at 2800+ tomorrow at 75mph. I'm not sure what impact that might have but just something I'd note and consider if I were you.
This is a very good point and one I had not considered. I’ll have to do a bit of research to see if that could effect longevity. Part of me doesn’t care because I want to put a hemi in it anyhow but that’s a whole other discussion and something I won’t do for a long time.
 

ericnewcom

Well-Known Member
First Name
Eric
Joined
Nov 14, 2022
Threads
1
Messages
47
Reaction score
50
Location
US
Vehicle(s)
2023 JTR MT
Update to my earlier post. I checked the other day and 79 mph is the switch point for the oil pressure running 5.13 gears and 33" tires.
 

ShadowsPapa

Well-Known Member
First Name
Bill
Joined
Oct 12, 2019
Threads
247
Messages
40,442
Reaction score
53,858
Location
Runnells, Iowa
Vehicle(s)
'25 JTMX, '23 JLU 4xe, '82 SX4, '73 Javelin
Occupation
Retired auto mechanic, frmr gov't ntwrk security admin
Vehicle Showcase
3
You're right, I probably should do the math at least.
GVWR = 6250lbs
Curb Weight = 5050lbs
Carry Capacity = GVWR - Curb Weight
Carry Capacity = 1200lbs

Fuel = 6lbs per gallon * 22gal = 132lbs
All 4 passangers (Me, Wife, 1.5year old, and 2 year old) = 430lbs
RTT = 150lbs
Bed Cap = 250lbs
Gear = 200lbs

Cargo Weight = 1200 - 132 -430 - 150 - 250 - 200 = 38lbs left for snacks.

?, I'm getting close.
Go by the door sticker.......... where did you get the curb weight from? Hopefully not a web site. That won't be totally correct for most vehicles as what's listed on the internet is base model, no accessories or options.
Example - my 2020 had a higher payload than my 2022 does even though I ordered the same thing the second time around. So my payload for the same truck, 2 years later, is lower. That's what the law would go by - the stated payload for that truck.
 

Sponsored

ShadowsPapa

Well-Known Member
First Name
Bill
Joined
Oct 12, 2019
Threads
247
Messages
40,442
Reaction score
53,858
Location
Runnells, Iowa
Vehicle(s)
'25 JTMX, '23 JLU 4xe, '82 SX4, '73 Javelin
Occupation
Retired auto mechanic, frmr gov't ntwrk security admin
Vehicle Showcase
3
At 70/72 it's still at 30 psi.
3,000 RPM for the jump in oil pressure regardless of road speed.
So that means you are not running over 3,000 RPM at 70 mph
 

ericnewcom

Well-Known Member
First Name
Eric
Joined
Nov 14, 2022
Threads
1
Messages
47
Reaction score
50
Location
US
Vehicle(s)
2023 JTR MT
3,000 RPM for the jump in oil pressure regardless of road speed.
So that means you are not running over 3,000 RPM at 70 mph
Yeah I may not have been clear enough. I'm posting on my phone most of them time. Mainly trying to say most people cruising on the interstate won't cause the jump in oil pressure I've seen people mention before. Even with 5.13 and 33s.
 

ericnewcom

Well-Known Member
First Name
Eric
Joined
Nov 14, 2022
Threads
1
Messages
47
Reaction score
50
Location
US
Vehicle(s)
2023 JTR MT
I guess you like doing burnouts and buying tires
For me it has nothing to do with burnouts its trying to make up for the lousy 1st and reverse gear ratios. I think any manual trans truck should have a 1 mph ground speed at idle in 1st and reverse. Day to day driving take off in 2nd, space 5th and 6th more and 4.10s would be great. Essentially make it a 5 speed with granny 1st and reverse.
 

AustinL911

Well-Known Member
First Name
Austin
Joined
Jun 18, 2019
Threads
32
Messages
500
Reaction score
672
Location
Central Ohio
Vehicle(s)
2021 JTR 6MT
Occupation
Nurse
For me it has nothing to do with burnouts its trying to make up for the lousy 1st and reverse gear ratios. I think any manual trans truck should have a 1 mph ground speed at idle in 1st and reverse. Day to day driving take off in 2nd, space 5th and 6th more and 4.10s would be great. Essentially make it a 5 speed with granny 1st and reverse.
Been saying this as well. I'm envious of the Broncos 7 spd.
Sponsored

 
 







Top