Gear speed question, for newbie?
#1
01-26-2007, 04:00 AM
Gear speed question, for newbie?
I'm a new student driver and was wondering if anyone could provide me with gear speeds for a 10spd transmission? I searched around the boards and couldn't find anything. Thank you all.
#2
01-26-2007, 12:01 PM
Re: Gear speed question, for newbie?
Originally Posted by tcm2000
I'm a new student driver and was wondering if anyone could provide me with gear speeds for a 10spd transmission? I searched around the boards and couldn't find anything. Thank you all.
Eatons FR series B ratio overall: 14.80 (older RT/RTX series transmissions similar) direct: Rlow-16.21, Rhigh-3.63, 1st-14.80, 2nd-10.95, 3rd-8.09, 4th-5.97, 5th-4.46, 6th-3.32, 7th-2.45, 8th-1.81, 9th-1.35, 10th-1.00 overdrive: Rlow-12.12, Rhigh-2.72, 1st-11.06, 2nd-8.19, 3rd-6.05, 4th-4.46, 5th-3.34, 6th-2.48, 7th-1.83, 8th-1.36, 9th-1.00, 10th-.75 Eaton FR series C ratio overall: 17.17 (17.51 for 17210 and 18210 transmissions) (Older RT/RTX series transmissions similar) 11-16210: 1st-12.69, 2nd-9.29, 3rd-6.75, 4th-4.90, 5th-3.62, 6th-2.59, 7th-1.90, 8th-1.38, 9th-1.00, 10th-.74 17-18210: 1st-12.94, 2nd-9.29, 3rd-6.74, 4th-4.90, 5th-3.62, 6th-2.64, 7th-1.90, 8th-1.38, 9th-1.00, 10th-.74 Eaton "Super 10" B ratio overall 14.93 overdrive: 1st-11.06, 2nd-8.20, 3rd-6.06, 4th-4.49, 5th-3.32, 6th-2.46, 7th-1.82, 8th-1.35, 9th-1.00, 10th-.74 Meritor/Rockwell A ratio overall 15.02 direct: 1st-15.02, 2nd-11.14, 3rd-8.26, 4th-6.02, 5th-4.48, 6th-3.35, 7th-2.48, 8th-1.84, 9th-1.34, 10th-1.00 overdrive: 1st-11.19, 2nd-8.30, 3rd-6.15. 4th-4.48, 5th-3.34, 6th-2.50, 7th-1.85, 8th-1.37, 9th-1.00, 10th-.74 Meritor/Rockwell B ratio overall 17.53 overdrive: 1st-12.72, 2nd-9.23, 3rd-6.75, 4th-4.92, 5th-3.57, 6th-2.58, 7th-1.88, 8th-1.37, 9th-1.00, 10th-.73
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#3
01-26-2007, 01:02 PM
Senior Board Member
Join Date: Jan 2005
Location: East Central IL between the corn and the beans
Posts: 4,977
While it varies depending on the exact ratios of the rears and the make/model of the trannie a starting point for you would be:
In the high range add the two number together and that is the gear you should be in. For example 45 mph= 9th 35 mph= 8th 15 mph = 6th I think you get the idea. It is not a catch all forumla to be sure, but it will get you by until you learn the truck you are driving. In low range it comes more with experience than anything. WHen you shift though you should be upshifting at 1500-1700 rpm and downshifting at around 1100-1200 rpm.
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