notchy gearbox at startup ??

[Duncan]

(B1) MR_fanny, I think you need a new mechanic, the problem is worn sychros between the gears (common problem)

And a quick shift kit will make the problem worse as it makes the synchros work harder.

[benm]

Can syncro's be repaired or only replaced?

I put the Redline Shockproof in my gearbox about 8-9mths ago and while it was really good to begin with the last month or 2 i've noticed that its back to what it was on the old oil (crunches often)

I'm not sure whether to put in fresh redline (or another brand) or get a gearbox mechanic to have a better look at the -real- problem.

Thoughts ?

[Duncan]

Just shift slower and put more redline in

And when something finally goes boom in there, replace the synchros while the box is out.

Even better, shift without using the clutch and the synchros will never be required at all

[Busky2k]

JimX, I didnt think i'd find it because i read it like 6 months ago, so I didnt even bother to google it! hahaha

But yeah, I would only use shockproof if the gearbox is already shagged. If its fine, then I would use something else like maybe their MT90/MTL range. Additionally I would recommend Castrol Syntrans for the box and/or Motul Gear300 for the diff/box.

[JimX]

I was thinking of using Castrol VMX80 in my box. It's meant to do a similar job to Redline, but I'm not sure if it comes with increased wear. I wouldn't say my gearbox is shagged. It crunches into 5th fairly often, but not always. The other gears are fine. So I think I wanna do this sooner rather than later.

[Busky2k]

JimX, VMX 80 should be fine as thats what Castrol recommend for our Nissan boxes. However I reckon its a bit thin being a 75W-80, but I think it should be ok. I would recommend spending a little extra and getting Castrol Syntrans 75W-85 since its synthetic and a bit thicker! Otherwise Motul Gear300 75W-90 or Redline MT90 would do the trick!

[BuzLightyear]

I have used VMX80 and Shell Helix fully syn 75/09 which is a GL5 rated oil, and prefer the Shell. (Not sure if

[BuzLightyear]

I have used VMX80 and Shell Helix fully syn 75/09 which is a GL5 rated oil, and prefer the Shell. (Not sure if VMX80 is GL5 or not)

Redline is an 80/120 oil (from memory) which will help the synchros, but it might make for a slower gearchange (?).