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Old 06-25-2019, 08:42 AM   #1
Mini-Skoolie
 
Join Date: Jun 2018
Location: Iowa
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Year: 1998
Chassis: Bluebird
Engine: Cummins 5.9L inline-6H
What gears do I have

Attempting to get from 55mph to 65-70. Not sure what gears i have and what I'd need to replace them with

Attached image of plate on the rear-end. 1998 fs65 bluebird cummins
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Old 06-25-2019, 08:55 AM   #2
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5.13:1 according to the plate. Anything can happen though and that plate might not be right. Best is to either count teeth, count rotations, or do the math with your current speed/rpm.
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Old 06-25-2019, 09:06 AM   #3
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Quote:
Originally Posted by Booyah45828 View Post
5.13:1 according to the plate. Anything can happen though and that plate might not be right. Best is to either count teeth, count rotations, or do the math with your current speed/rpm.
Here's a tool on my website I made to help with the RPM/Speed brute forcing cuz I'm too lazy to count rotations.

SPEED CALCULATOR

I plugged OP's number in with both the common transmissions in that bus (3060 and 2000) and he should be getting much, much faster speeds with 5.13 gearing. I'm guessing the gearing was changed at one point, even with the sixth gear locked OP should be getting much more than 55MPH.
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Old 06-25-2019, 10:50 AM   #4
Bus Crazy
 
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Quote:
Originally Posted by geminusprime View Post
Here's a tool on my website I made to help with the RPM/Speed brute forcing cuz I'm too lazy to count rotations.

SPEED CALCULATOR

I plugged OP's number in with both the common transmissions in that bus (3060 and 2000) and he should be getting much, much faster speeds with 5.13 gearing. I'm guessing the gearing was changed at one point, even with the sixth gear locked OP should be getting much more than 55MPH.
1998 with an ISB could have an at545.

What's your figures say for 1:1 trans with a 5.13 and 40.2 inch tires? I'm betting close to 55 mph at redline.
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Old 06-25-2019, 11:01 AM   #5
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Join Date: May 2016
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Engine: T444E
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Quote:
Originally Posted by geminusprime View Post
Here's a tool on my website I made to help with the RPM/Speed brute forcing cuz I'm too lazy to count rotations.

SPEED CALCULATOR

I plugged OP's number in with both the common transmissions in that bus (3060 and 2000) and he should be getting much, much faster speeds with 5.13 gearing. I'm guessing the gearing was changed at one point, even with the sixth gear locked OP should be getting much more than 55MPH.

It is unclear if the bus in question has overdrive or not. We need engine RPM's at that speed to know. I see 2 possibilities. Either the bus is running max RPM's at 55 (which mine does) and will need regearing, or it's an overdrive transmission, turning lower RPM's at 55 and is computer limited to 55 (easily unlocked via computer by any shop, can be a DIY thing if you have the computer/link/software to do it).


Since the thread is about gearing, I will assume the former, if for no other reason than to answer the gearing question. Since I have 5.38's in mine, no OD, a 1:1 top gear (manual transmission), 10R22.5 tires, I get around 55 at ~2300 RPM. I'm considering a 4:11 gear (~70 top end) or 3.91 gear (~74 top speed). I'm not too worried about losing acceleration or performance in hills since the trans has a pretty low first gear (I frequently skip it and start in 2nd) - and it's a shorty.
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Old 06-25-2019, 12:16 PM   #6
Mini-Skoolie
 
Join Date: Jun 2018
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Year: 1998
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Engine: Cummins 5.9L inline-6H
Bus sits at 1700 rpm and 55mph
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Old 06-25-2019, 12:20 PM   #7
Mini-Skoolie
 
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Some. Images if they help
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File Type: jpg 20190330_142912.jpg (254.2 KB, 9 views)
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Old 06-25-2019, 12:25 PM   #8
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Quote:
Originally Posted by Hazin View Post
Bus sits at 1700 rpm and 55mph
Its electronically limited then.
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Old 06-25-2019, 12:55 PM   #9
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Quote:
Originally Posted by Hazin View Post
Bus sits at 1700 rpm and 55mph
Quote:
Originally Posted by EastCoastCB View Post
Its electronically limited then.

Yep. Any truck shop/bus barn should be able to edit that. Mine is hardware limited (2300 at 55), but if mine were a software limit, I'd have it disabled entirely. Many companies and bus shops do that "for safety", and more quantifiably, fuel savings. Also to cut down on speeding tickets.
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Old 06-25-2019, 01:34 PM   #10
Mini-Skoolie
 
Join Date: Jun 2018
Location: Iowa
Posts: 28
Year: 1998
Chassis: Bluebird
Engine: Cummins 5.9L inline-6H
Local cummins service center indicated there is no such thing on my bus, that it is not limited or governed. They recommended sending in the Bosch fuel pump to have it tuned to how i wanted it or to replaced the rear end gears.

I did replace the fuel plate/spring last fall as well as adjusted smoke screw a few times, and it did not change anything.

Quote:
Originally Posted by EastCoastCB View Post
Its electronically limited then.
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