• Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!

  • Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.

2.5 ton rockwell how much can it take?

Ryan123

New member
81
2
0
Location
Brighton, Colorado
yeah that seems like that can get pretty expensive. Also the gears are still pretty low even in the 5 tons. Just read an article on the 2.5 ton t case and people are still using them in monster trucks with 60 inch tires and big power. That being said I am not too worried about it anymore.
 

gringeltaube

Staff Member
Super Moderator
Moderator
Steel Soldiers Supporter
6,983
2,518
113
Location
Montevideo/Uruguay
Here ill do the math for you. The gears cost 1200$ each so that's 3600 bucks not cheap I know but its better than a brownie box (hacked in).

Here is the math

2100 RPM divided by .63 trans OD =3333.33 divided by 4.90 axle ratio= 680.27 times 10.55 rolling circumference of my 43 inch tires at 96 percent =7176.87 feet per minute times 60 minutes = 430612.24 feet per hour divided by 5280 feet per mile =81.55 MPH

that being said I DO NOT WANT TO RUN THAT FAST however without the gears you get 59 mph. I would like to run 65 MPH at a lower RPM for better fuel consumption and not have to have the motor pegged out.
This style sounds all so familiar..... it's been a long time we didn't hear from this guy... we sure had some fun here...!


G.
 

steve6x6x6

Well-known member
Steel Soldiers Supporter
1,425
37
48
Location
Winter Haven, florida
Here ill do the math for you. The gears cost 1200$ each so that's 3600 bucks not cheap I know but its better than a brownie box (hacked in).

Here is the math

2100 RPM divided by .63 trans OD =3333.33 divided by 4.90 axle ratio= 680.27 times 10.55 rolling circumference of my 43 inch tires at 96 percent =7176.87 feet per minute times 60 minutes = 430612.24 feet per hour divided by 5280 feet per mile =81.55 MPH

that being said I DO NOT WANT TO RUN THAT FAST however without the gears you get 59 mph. I would like to run 65 MPH at a lower RPM for better fuel consumption and not have to have the motor pegged out.
It will cost you more than $3,600.00 , shipping + bearings + seals + labor. 65 mph X 43" tire X 4.90 ratio X 37% OD = 1,667 rpm?
 

Ryan123

New member
81
2
0
Location
Brighton, Colorado
It will cost you more than $3,600.00 , shipping + bearings + seals + labor. 65 mph X 43" tire X 4.90 ratio X 37% OD = 1,667 rpm?

well yeah I suppose you are right on that but I dont think it will be 5500 hehe. Yes 1667 RPM sounds about right. The 6v92 I think (i would have to go look) makes peak torque at 1500 rpm
 

steve6x6x6

Well-known member
Steel Soldiers Supporter
1,425
37
48
Location
Winter Haven, florida
5 ton axles with 6.44 and 43" tire and just the 37% OD at 65 mph = 2,171 rpm, save a lot of money. OR 14.00x20 tires 65 mph at 1,894 rpm.
 
Last edited:

Ryan123

New member
81
2
0
Location
Brighton, Colorado
Yeah I did the math on that just a bit ago. Its a tough call... 5 tons would be nice... still though thats pushing that 92 running like that for hours on end while on the highway. IF ONLY IT WAS A 6:1 GRR. The marine guys run the 6v92's at 2300 RPM I think I might talk to one of my contacts to see how long they run them like that to see if they hold up or not. I really do like the 5 ton Idea though!
 

w3azel

Member
229
0
16
Location
Waipahu/HI
5 ton third members fit into 2.5tons?
I was referring to an ouverson violator kit that changes over to 2" 47 spline shafts. Rear is $1700 front goes from $2550 to $4050 plus machine work. Just on option to think about if you start breaking stuff.
 

Ryan123

New member
81
2
0
Location
Brighton, Colorado
I was referring to an ouverson violator kit that changes over to 2" 47 spline shafts. Rear is $1700 front goes from $2550 to $4050 plus machine work. Just on option to think about if you start breaking stuff.
man that is steep... I did see those kits. I was thinking of doing the 4.9 gears with the girdle kits to stiffen the 2.5 tons up a bit
 

NDT

Well-known member
Steel Soldiers Supporter
10,421
6,459
113
Location
Camp Wood/LC, TX
I'll chime in. My deuce tractor runs 185 hp LDS and I used to gross 50,000 GCWR and run 55 mph. The Rockwells would just about be glowing after hours on end. The axles can handle significant hp and torque in spurts, but the heat buildup is what kills them for OTR use with big power and weight.
 

Ryan123

New member
81
2
0
Location
Brighton, Colorado
I'll chime in. My deuce tractor runs 185 hp LDS and I used to gross 50,000 GCWR and run 55 mph. The Rockwells would just about be glowing after hours on end. The axles can handle significant hp and torque in spurts, but the heat buildup is what kills them for OTR use with big power and weight.
so would say 6-7 hours be considered to long I suppose?
 

rustystud

Well-known member
9,259
2,943
113
Location
Woodinville, Washington
I'll chime in. My deuce tractor runs 185 hp LDS and I used to gross 50,000 GCWR and run 55 mph. The Rockwells would just about be glowing after hours on end. The axles can handle significant hp and torque in spurts, but the heat buildup is what kills them for OTR use with big power and weight.
NDT you got that right ! On our busses we have differential coolers since they use gear reductions in the hubs. That really can get hot ! Our busses are also speced out at 35mph as the average speed. I used to rebuild double reductions single speed and double reduction two speed units a lot. These trucks they where in never went over 40mph. In fact most never left the woods they worked in. All over the road riggs differentials only use a single gear set, never a double like our rockwells.
 
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website like our supporting vendors. Their ads help keep Steel Soldiers going. Please consider disabling your ad blockers for the site. Thanks!

I've Disabled AdBlock
No Thanks