I have a 91 CRX Si tranny that was rebuilt in January of '05. It was a stock Si trans with new synchros, exedy oem clutch, throwout bearing, and resurfaced flywheel.
I have autocrossed it at at least 50 events since then over the last 2 years using 1-2 gears, and 3rd only a few times.
I have daily driven the car, but not abusively
Never drag raced
I've had no horrible misshifts that I can remember
I have ES motor mount inserts and shifter bushings.
In December of 05, and just this December I have drained and refilled it with Honda MTF
Problem:
The trans shifts quickly and flawlessly at high revs through all the gears, except 2-to-3 upshifts grind badly unless I let the revs fall to 4250 or so.
This is unexpected since I would expect 1-2 to be problematic from autocrossing, but they are smooth and easy, even above 6000 RPM. I have only used 3rd gear about 4 times in autocrossing over the last few years, so I dont think its been abused on the track. However, I want to do an HPDE or Time Trial this year, and waiting 2 seconds for the revs to fall from 7000 to 4250 is not a good thing...so I want to fix the 2-3 grind problem.
I'd like any input on where to start with troubleshooting this problem... clutch adjustment? shift rod or fork? bad synchro?
I was hoping the new Honda MTF from just last month would make at least a small difference, but it didnt at all. I'm willing to try anything before I get another rebuild.
The trans was rebuilt by effinmotorworks (they still occasionally do some work for locals), and I bought the kit and and new synchros from standard transmission, and the cones were definitely scuffed by Rueben at effin when he did the assembly. I got a very good deal on this trans, and I helped as much as possible on the install.
Now the forks in the trans are a different story. I dont know anything about them, but I'd be willing to bet that's the weak link. The trans was from another crx, and I traded my worn out one in as a core when this one was finished being rebuilt.
Transzex, if the 1-2 fork is bad, does that effect the 2-3 upshift? I ask because like I've said, my car has seen alot of hard 1-2 shifts...and it still takes them quite well.
I have a garage, air, almost every tool imagineable, and I'm mechanically inclined enough to do anything that doesnt require a super-expensive exotic micrometer. Should I be able to fix this? Would I need to replace the shafts? springs?
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