If memory serves me right. .87 (old RTO14613) x 3.42 x 516 (revolutions per mile for that tire) = 1535 then 1550 RPM X 60 = 93000 take 93000 divided by 1535 gives us 60.6 MPH at 1550 If it's a newer RTLO transmission, then it's .73 ratio in top hole then it come out to 72MPH at 1550
That's a lot of memory for an old guy, but I think I calculated right
RPM x 60 (divided by) transmission gear ratio x rear end ratio x tire revolutions per mile = MPH
Use this to figure out what any tire size changes or rear end changes will have on MPH
help request 1990 fld 3406b cat top speed 55mph on 1550rpm
Discussion in 'Trucks [ Eighteen Wheelers ]' started by omar.ib, May 15, 2022.
Page 2 of 2
-
-
Trucking Jobs in 30 seconds
Every month 400 people find a job with the help of TruckersReport.
-
Step one on 3406B power issue is change fuel filters.
-
LameMule Thanks this.
-
-
-
BoxCarKidd and mtoo Thank this.
-
Are you able to wind it up to 2100 in any other gear ? That engine likes to be wound up . It isn't like these new engines 1550 she is just getting started .
BoxCarKidd Thanks this. -
Trucking Jobs in 30 seconds
Every month 400 people find a job with the help of TruckersReport.
Page 2 of 2