When to fill gearbox back up?

Tifosi,

I just replaced the shift shaft seal on my 88, not a bad job and gave me a chance to replace the silentbloc bushings too. It is ready to refill with oil but I have a question:

Clutch started to slip at the end of the season (my fault as I was dealing with intermittend 6 cylinder cutout and just the light feel of a TR clutch). I am going to replace the clutch while it is still winter (and I have the parts). My question is WHEN should I refill the gearbox?

I haven't looked too deeply into what has to come off to do the clutch but doesn't look like a bad job at all. Do you lose gearbox oil when you take that cover off? I see there are some O-rings which I bought.

Experienced stories appreciated. I'm just happy to know my shifter is adjusted perfectly now. Having it all apart makes the adjustment foolproof!

Thanks,
Cassidy

 

I pulled the front drain plug to do the job so I'd guess it's 90% empty. I'll do the other just to start with fresh fluid throughout.

What I'm thinking is Mobil 1 75w90 or similar and two bottles of GM's Limited Slip Additive. Does that sound reasonable or is there a better alternative?


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Good to know. Thank you. Excellent info. I've had the brakes, cooling system, shifter, dash, seats and soon to be clutch out this winter. It's been a busy season of work but she will be right as rain come the spring. Deferred maintenance and some ravages of time, all corrected with time and effort.


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