speedjunky01

the tranny is a used AP2 unit I bought from a member on here, it shifts dead smooth and without issue cold or warm 1st-6th. But as of today it has no and I mean NO reverse. I went to back into a spot at the bank heard a clunk and a grind and now it doesnt move at all in reverse with the clutch fully out.

-The shifter does move to R without a problem the light come on and everything
-Shut car off on a hill, put in R position, let off clutch, the car rolls down the hill like its in neutral
-in the forward gears now there is a bouncing noise almost like a gear bouncing off other gears only while moving. Ill drain the fluid tomorrow
-New slave and new fluid bleed properly with the slave unbolted
-Master doesn't leak
-Fresh honda MTF about 2k on it
-Clutch pedal is adjusted correctly
-Can't hear or feel any kind of "engagement" when shifting into R like I can into 1-6

I'll poke around more tomorrow but would love to get a list of things to check over before I decide to pull the tranny again....

speedjunky01

No ideas s2ki?

SpitfireS

Before everything: the plastic bushings of the shifter itself are all there and all ok?

This makes me think its the idler gear.
Reverse is taken from 1st gear of the main shaft, via an idler gear to the countershaft, this extra gear makes it reverse.
If that idler is not in gear with both 1st of the main shaft AND reverse on the countershaft = no reverse.
As far as I know: selecting reverse is no different from selecting any other gear = you move a synchro (yes, even reverse has a synchro) and a splined hub to connect a free-wheeling gear to a shaft.

That idler gear is on a short shaft, and hold in place by one bolt.
This bolt should be visible from the outside, as far as I can tell from drawings in the service manual: on the clutch fork & slave side.
And its close to the mating surface - the "gearbox side" of the bell housing.
Its an 8mm bolt, most likely 12mm hex head (or 13, but Honda 8mm bolts usually are 12mm hex)
Sorry, I can not explain it better and I have no real pictures.

So: check the gearbox for loose or missing bolts.
If everything is ok, IMO its a internal problem.

Slows2k

If the pin that goes through the internal shift lever isn't fully installed you will have no reverse. The trans case has to be separated to repair. The pin is held in by a bolt from the outside of the case.

Back S2k

silly question but how often r you rolling forward or back when shifting into reverse? is it possible that u might have just grindded down reverse to nothing?

speedjunky01

what spitfire and slows2k are saying makes sense to me and it sounds exactly like my issue. just sucks I have to rebuild the tranny I've done a few FWD civic trannys without issue but this more seems more difficult looking at the helms ugh

black s2k no way it would have ground to nothing

speedjunky01

Whatever the problem is it is not good at all here is 500 mile old mtf



I bought this ap2 tranny off a member of s2ki last fall and installed it over the winter ill be having some words with him in a few days

ahrmike

is that entire thing covered in a metal sheen + metal chunks?!

speedjunky01

Yes sir

james0933

Wow lol.