Think I got swindled.....transmission

2012 Cascadia, 10 speed, Dd15...I bought 3 years ago....has 620k miles on it now....deleted... pretty good truck for the most part.

I replaced the clutch 8 months ago.....and since then....the rpm/speed sequence is off. Im at 1500 rpm already goin 17 mph in 6th gear.....1500 rpm, 18 mph goin into 7th. Im already in 8th gear at 25 mph...1500 rpm.....never had this issue before.

I took it to 3 mechanics....had computers put on it....progressive shift disabled.....nobody could figure this out.

Someone told me to check the transmission serial #. The plate was spray painted out....so i scratched the paint off and got the #'s. Come to find out....it's not the original transmission. A mechanic also said it's not even the right transmission....has no overdrive.....and that yard drivers use these.

This mechanic told me that if i didn't have these issues until 8 months ago.....most likely the transmission was swapped on the clutch job.

He asked why was the serials # spray painted black??? And even if someone did replace the transmission.....they wouldn't have put that one in with no overdrive.

Is there a way to look further into this to see what transmission was in this truck when I purchased? I got it from Arrow truck sales....and I've had dyno done on this truck a few years ago....no issues.

All fingers point at the mechanic right now who did clutch job.....no one's ever touched transmission prior.

Any ideas.....am I looking at this right?

Thanks

 

I will.....but some could argue that the transmission could've been replaced afterwards. I bought it with 470k on it.....so replacing it would seem unlikely.....but some would still say its possible. Crazy thing is....when I purchased it....it had a 1 year warranty on it

 

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I understand where you're coming, but no other mechanic thought of checking transmission serial # until I mentioned it.....and no...i didn't check it when I purchased. Im just doing alot of back tracking to see if that was the transmission when I purchased the truck.

If it wasn't, then I'll do what I need to do....I'm probably not gonna let that slide regardless.

 

Yes....it started after the repair....I've taken it to 4 mechanics.....nothing....I've posted isdue on several other threads.....didn't really get anywhere.

I talked to another mechanic yesterday....told me to check the serial # on the transmission....no one else told me to do that, or even checked it themselves. Thats when I found out it wasn't the original transmission.

 

Yeah.....now I'm all worked up about this transmission

 

Yes he gave it to me, as well as Freightliner