unfortunately, a tapered bearing upgrade cannot be done to the 6-speed.
the output shaft roller bearing snaps onto the rear case, and this prevents the bearing from rubbing against the 6th gear on the input shaft.

 

Thanks for info... is there others upgrads for the 6 speed possible or its better to go 5 speed?

 

much better to go to the 5-speed. the only factory available upgrade, that i know of, is the improved 3rd/4th gear set from mitsu. it eliminates the play in those gears, which has caused failures.

 

Hmm i think so i sell my 6 speed and change to 5 speed! Can you tell me what i must change? I have a euro evo 9! I know that i need others tranny mount, shifter cabels and shiftbox. But whats about clutch? I have a exedy twin hd install! Work it with the 5 Speed too? And what kind of trannys can i install evo 5 6 7 8? Are there some difference? And what ist the best one?

 

clutch is the same, you need the small 5-speed wiring harness that goes to the reverse light sensor and speed sensor. clutch is the same.
i like the evo 8 speed ratio's the most.

 

Disregard please

 

Sanity check please:

Using .001" dial calipers here is what I have...

Input shaft solder crushed to .071" (hits 71 on gauge)
Current input Shaft shim is .056"

That would mean my current clearance is .015"

I believe this to way WAY outside the limit and I just replaced the input shaft bearings...

Am I using my tools wrong here?

Would this mean I need a .0675" (1.7145mm) shim?

 

you are not outside the limit. they make a shim up to 1.79mm
your old shim shouldn't be used in the calcs. I would select a 1.61mm shim (MD723609) but you may push it to 1.70mm shim (MD756760)

 

Thank you for your help and for actually providing the part numbers!

Unless you see an issue, I'm going to order the 1.70mm shim as I believe it's better for daily shifting to be on the tight side of the spec.

 

What is the spec for the clearance?

you might get a more accurate reading with a dial gauge, because you are measuring directly.

With solder you are transferring the distance to the solder then measuring that.

 

Spec = Input shaft end play: 0.05 − 0.17 mm (0.0020 − 0.0067 inch)

My clearance without a spacer is .071"
Current spacer is .056" - too much clearance! (.015")

So I ordered a few shims from shep in the .0657" to .0665" range, this should get me to the right spec....i hope

 

subscribed.

 

If you go too tight on the input shaft it'll make it more difficult to engage first gear from a stop. I like to set the input shaft clearance on the tight side of OEM spec, like around .002" freeplay.

 

I'm shooting for .003 or .004"

 

I took mine off and I'm thinking on taking it apart. The issue is that everytime I press the clutch while driving it makes a rattling noise. Any input on this? Could've been the clutch? It shifts smoothly while cruising no grinds or anything