Fist off the gearbox is from a Hydro 00' JDM Civic Type R. It came with a 4.4 FD but I swapped and sold that for an Mfactory 4.785, and I now I took that out and sold it and purchased a GSR 4.4 FD from a fella on here. I went back 4.4 because I am boosting the car. So now I was putting everything back together along with a new set of Synchro tech 1-2 & 3-4 carbon synchros, but the damn mainshaft will not turn when you bench shift it into gear. When I took a screwdriver and tried to manual shift it at first, it wouldn't shift, but after a little shaking it started to shift. In 1st and 2nd the mainshaft spins freely, in 3rd and 4th it spins then tightens up, in reverse it spins freely like 1-2, but in 5th the shaft locked up completely and doesn't spin an inch. Oh, it spins freely in neutral also. I took it to two separate mechanics who took the whole assembly apart and still had the exact same problem! What could this be??? It has me totally stumped. Ant input is greatly appreciated.

 

bump for any kind of ideas.

 

i have had the same issues, the only thing i have been able to do that got it to work was to swap the final drive for another one, it was a gsr final drive and i pulled it out, swapped the big gear and the counter shaft, it all worked then.... i have no idea why it did that, the gsr final drive worked in the gsr trans it came from. dont know why it happened or what was wrong but i do know that the problem was solved then. is ur counter shaft correct?

 

frinal drive ring gears HAVE to matchthe counter shafts that they originally came with, otherwise this is what happens. do you have any pictures? i can help out with what ever needs to be helped with. as well as synchro-tech...where you at dave? lol

 

I am sory it took so long but I figured out what the problem was. The other guys were just taking the gears off and putting them back the same way I had it without looking at the sequence, but I took my time and saw that I had the i/2 sleeve upside down, so there was a misalignment with the fork.

 

that would do it!

 

Actually, two transmissions I've opened up with work done by other people have had mismatched ring and countershaft gears (idiots!) - making an odd ratio that Honda had never intended. Because the teeth on both ring gears (let's say 69 and 72 for just a quick example) both yield similarly sized and shaped teeth due to the large number of teeth, and the teeth of the countershaft will also do this, due to the small number of teeth and small diameter of the gear. So by hand, you'll be surprised to find out that they interchange and you won't notice. So it wouldn't have locked up his trans like so in two or three gears and not the others had this been the case. Running it like that though, is obviously not good, as you suggest. lol

 

true. was a general rule of thumb which what i was trying to get at lol