[Spridgets] Motor Oil in the Gear Box

[Dean Hedin]

Maybe..  But I've read elsewhere that it is not uncommon for a freshly rebuilt manual transmission to
be a little crunchy until the synchros have had a chance to break in.

I don't have very many miles on the transmission at this point.  Probably less than 200.
I am not too worried about the 1st 2nd crunch , because:
1) I can be gentle with the shift and it does not happen.
2) I have seen some improvement with use.
3) I don't have this issue in other gears.

The noise in neutral I am more concerned about.  How noisy is yours when idling in neutral?

----- Original Message ----- 
From: rrengineer @dslextreme.com
Subject: Re: [Spridgets] Motor Oil in the Gear Box


Rivergate probably used the same after market synchros that Paul did on my rebuilt transmission.  When I told him it would crunch 
going into 3rd gear, he said the synchros had the wrong angle machined into them.  He sent me a set of the best used Datsun synchros 
he could pick out.  He offered to rebuild it with the used synchros, but I did not want to go through the hassle of shipping it from 
Southern California back up to him.  I decided to have a trans shop or some knowledgeable Spridget list member help me swap them 
out.  Interesting though, I had Castrol synthetic GL-5 85w-90 oil in it when it was crunching in 3rd (hot or cold).  I recently 
bought regular Sta-Lube Hypoid GL-4 85W-90 gear oil and drained out all the old oil and replaced it.  Now it crunches in 2nd 
sometimes!?!  WTF?  Now I am wondering what Redline MT-90 will do to the shifting?  In any case I have to baby it when shifting and 
cross my fingers when I downshift in ANY gear.  There is some improvement when it warms up as you are experiencing Dean, but I don't 
think that is good enough.  I am quite sure it never crunched in any gear when it was in a Datsun 210 and only had regular GL-4 gear 
oil in it.  I believe the synchros are yours and my problem.
Mike MacLean