5 speed Clark 280 V0 grinds going into 3rd

[jibronee]

I bought a used, 1970, Ford, previously rebuilt clark 280v0 5 speed. It's a close ratio with OD.

Shift pattern is:

1 2 5
R 3 4

Seems pretty odd to me, is this std?

Also grinds when going from 2nd to 3rd if shifting to fast.

Definitely grinds when down shifting from 4th to 3rd. Actually can't downshift because of grinding.

Anyone have any info on these trannys? What wears down in them? Where to get synchros? Any specialty tools needed to replace synchros/bearings?

Thanks in advance!!!
Chris

 

[Clb]

Old school pattern, might be time for a refresh

 

[Thewespaul]

You can try changing the fluid but likely needs synchros and maybe forks too. Midwest trans will have all you need

 

[jibronee]

I put in new 85w-140 std oil. I'm wondering if a synthetic fluid would help facilitate shipping? Maybe a thinner

 

[Clb]

Worn out is worn out, slicker oil may not spin the synchro...cheap diagnostic, try it.

 

[edpruss]

In the meantime, learn to double clutch when shifting into 3rd.