Will putting an overdrive transmission help with my high rpm/low speed issue? Truck hasn't been running smooth....here's what's happenning in high gears:
6th gear.....I'll be at 10mph at 1500 rpm already
I'll be in 7th already at 18mph/1500rpm
Ill be in 8th already at 25mph/1500 rpm
I'll be in 9th already at 30 to 35mph/1500 rpm
This is bobtailing.....under a load...its worse.
The rpms are increasing fast versus speed...no slipping.
The transmission and clutch have been pulled due to the lever not working to go into high gears....mechanic said he can fix the tail end of transmission. He said gears look ok in transmission and that I should replace the clutch....even though I put a new one in 15 months ago.
Its a 2012 10 speed direct transmission with 2.64 rears.
If I put and overdrive transmission in.....will that help the high rpm/low speed issue? Because if I just fix the tail of the transmission and replace clutch....I feel like I'll still have the same issue.
I have to let mechanic know what I wanna do tomorrow.
Any advice?
High Rpm....low speeds
Discussion in 'Ask An Owner Operator' started by trucky909, Sep 20, 2020.
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Well if the RPM is higher at a given speed now vs before, the clutch has to be slipping.
Either that or your speedometer or tachometer are giving a false reading.Rideandrepair, Dino soar, MACK E-6 and 1 other person Thank this. -
Well now I read the part where you state the RPM is higher at those speeds when loaded vs bobtail. Clutch is slipping.
Rideandrepair, Dino soar, Cattleman84 and 2 others Thank this. -
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Dino soar, MACK E-6 and Swine hauler Thank this. -
I've had 2 people drive the truck....they said somethin aint right with the rpm and speeds. -
Every truck/trans is going to be different, my truck with an 18 speed and 3.55s runs/shifts different then my uncles 15 speed with 4.33s which is different from the rto 13 speed with 5.13s. You more then likely bought a fleet truck that was governed at 60/62 for mpg, how bad is/was the clutch did they actually do the clutch the first time or adjust it and tell you they did it? Might need another adjustment if you are starting off in a high gear.
Sounds like you bought the wrong spec truck for what you wanted, did you have a good year? Take the write off and swap in an rtlo 13 speed and some taller rears that will work better with Your engine/load/terrain -
Ok you've started another thread like this in the past 4 or 5 months. Is it the same issue or is this something new? I know you've deleted the truck and the transmission was swapped out to a different model. Did you ever get the parameters in the ECM verified to see they were set up correctly? Did you ever bother to look up the transmission ratios for each gear and plug them into a calculator like @singlescrewshaker posted? That'd tell you right away if this issue is related to the wrong transmission being installed or if its an issue with the ECM program from the delete. Hell if the transmission was changed there could be the wrong tone ring on the output shaft and its giving the wrong signal to the speedometer.
You really need to include all this pertinent information if you want to resolve this problem. Half stories will get you nowhere in solving this.Last edited: Sep 20, 2020
Crude Truckin', Dino soar, lester and 4 others Thank this. -
Think I got swindled.....transmission
In case somebody can pick up on something that might have been overlooked a few months ago.Ridgeline, Dino soar, jamespmack and 2 others Thank this.
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