Hi Shannon, My rebuilt transmission,( had my original unit done by John
Esposito) will occasionally grind on a quick upshift from 2nd to 3rd,
but it's getting better. I also switched from 30w oil to redline MT-90
which slickened things up and the OD works fine with it. I've only got
about 300 miles on it, but the grind is about gone. I assume it's the
synchro rings wearing in. No idea about it popping out of gear. Mine
has never done that, even before the rebuild. Could it be that the
clutch isn't completely disengaging? I had a lot of slop in the pedal
bushings. I ended up welding up the hole in the clutch pedal and
redrilling the hole. Then I replaced the clevis pin and that gave me a
clutch that disengages about half way to the floor. Just a thought.
John Mitchell 76TR6
Shannon Muncy wrote:
> Listers,
>
> I've had a strange issue that has been bugging me for months.
>
> History: About a year ago I purchased a remanufactured gearbox and J-type
> (preassembled) from a highly respected rebuilder that ships all over the
> nation. When I installed the gearbox, I put in 30w non-detergent oil in the
> box as suggested and started driving the car. Almost immediately, the gearbox
> started to slip out of all gears during deceleration and grinding between
> gears; especially the 3 -> 2 downshift and the 2 -> 3 upshift (but only when
> done quickly). I called the rebuilder, he said that the grind is normal and
> to allow time for the sycros to break in. However he didn't have a clue about
> it slipping out of gear; he said to ship it back, no questions asked. Now the
> strange part: He couldn't find anything wrong..nothing, nada, zilch. But
> just to be sure he shipped me another rebuilt gearbox, complete with J-type
> overdrive.
>
> I got the "new" gearbox in (it had a different serial number) and it does the
> exact same thing; slipping out of every gear AND grinding, this with a new
> clutch/pressure plate and new HVDA hydraulic throw out bearing. Desperate, I
> drain the 30w oil and put in regular old 85w90 gear oil and just like magic
> the gearbox stops slipping out of gear, but the grinding remains. Now as I
> drive the car, it does seem to be grinding significantly less on the 3 -> 2
> downshifts than it did before, but the 2 -> 3 upshift grinds remain as bad as
> they ever were. About 50% of the time any shift faster than a leisurely gear
> change from 2nd to 3rd results in a grind.
>
> I really don't know what to do about this, so any advice you guys have to give
> would be greatly appreciated.
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