High Rpm....low speeds

Ok.......this is a 10 speed manual. I bought the truck in because the lever on the shifter stopped working to go in high gears.

Outside of that....the truck has not been running right. High rpms and low speed. Its not jumping like its slipping.....it's going from 0 rpm to 1500 in like 3 seconds....in gears 3 through 7....and my speeds are only increasing roughly 5 mph in each of those gears.

Put it like this....if im at a stop light bobtailing. When the light turns green.....i will already be in 7th gear in about 6 seconds from shifting in each gear at 1500 rpm. Sometimes I float from 5th to 7th at 15 to 18 mph.....because if i go in 6th gear....it will still feel like im in 5th gear with no added speed.

The only way I can downshift to 7th gear for example....is if im going 15 to 20mph.....thats not supposed to be the case.

It never used to do that.

The 2 people I let test drive my truck said somethin isn't right. I've already had my clutch replaced because of slippage....so i know what slippage is.

I just want the truck to run smooth and drive right with regard to rpm/speed.

If im under a load at a stop light.....it will take me 60 seconds to get up to 55mph.

There's an issue here that im trying to find out since the transmission and clutch have now been removed.

Screw the other posts at this point....this is the best up to date info I can give you.

 

Sure....
I have 2.64 rears....10 speed manual direct transmission. Hopefully this answers your question. Freightliner also gave me model #. If there's another special name for the transmission to identify what i have.....then I have no freaking clue.

 

FR15210B

 

I'm just as lost.....maybe it's one of those things where someone has to drive it to see... but I've done that already.....both said somethin aint.....what that aint is....im trynna figure. I mean....it's on the operating table in the hands of a mechanic right now. I got one mechanic tellin me to price out another transmission to possible fix the issue.....the mechanic that has it now suggested that maybe the transmission was swapped shady somehow.....said the gears look fine.....I have no idea what to do....but i have to let him no what I want to do tomorrow morning.

If he just fixes the tail end of the current transmission and replace the clutch....its $3,500....the other mechanic told me that's probably not gonna fix the high rpm/low speed issue....I don't know.

 

Ok....so if this is your truck....what are you telling the mechanic to do or look into tomorrow?

I appreciate you looking into this