When building the transmission, you wanted to check each syncro ring to the
cone that it engages. There is often a variation in the inside diameter of
the syncro ring, and a variation in the outside diameter of the cone, and
you can mix and match syncro's until you get a combination that bites well,
of course of little consolation since the transmission is already completely
assembled and installed. If the syncro ring can't bite into the cone, there
will be a crunch engaging the ratio.
Your gear lube could be too slippery. Try a thicker oil. If memory serves
me correctly, unlike the ribcase, the 1500 box uses gear lube. If you
started with motor oil, switch it out for gear lube. If you started with
synthetic, switch it out for dino based. If you started with 90 weight,
jump up to 120 weight.
Dave R.
----- Original Message -----
From: "Chris King" <cbking@alum.rpi.edu>
To: <spridgets@autox.team.net>
Sent: Monday, November 09, 2009 3:24 PM
Subject: [Spridgets] Synchros?
> List,
>
> AT the OSHIT at Frank's this weekend, we installed a gearbox in my 1500
> that I rebuilt. New bearings, new synchros, new clutch forks.
>
> Problem is, I get a slight grind upshifting into 3rd, and a grind
> downshifting into 3rd or 2nd. Upshifting to2nd or 4th is fine, and
> downshifting into 1st is fine as well (1500 box, 1st has a synchro).
>
> We did replace the cover plate for the clutch, but we bled the
> hydraulics and I'm not convinced that's the problem. The catch point for
> the clutch is closer to the floor than it used to be.
>
> Can the 2nd and 3rd gear synchros be too tight? Would a slipperier lube
> help? I plan to re-bleed the clutch and see if that helps, but since
> this is specific to 2nd and 3rd, I'm nut sure it'll help.
>
> Thoughts?
>
> Thanks.
>
> -=Chris
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