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Help: What transmission fluid?

 
Old 04-21-2016, 11:34 AM
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kokolyia
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Default Help: What transmission fluid?

Good morning, so I found out (unfortunately while driving) that my adjustable bearings in my gearbox had disintegrated and got that fixed over the weekend so there is no more crunchy shifts. However it is still difficult to shift (and the clutch pedal is rather stiff). Especially into first. I'm thinking it could be the transmission fluid. What fluid do you recommend?

P.S. I have a C4
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Old 04-21-2016, 12:52 PM
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HalV
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The spec in the manual calls for SAE 75W 90 GL5. I've been using Mobil Delvac 75W-90.
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Old 04-21-2016, 01:34 PM
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Rocket Rob
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I'm using Swepco 201 but have used Mobil Devlac in the past. Both seem to work well.
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Old 04-21-2016, 01:37 PM
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Spyerx
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Mobil Devlac in all 3 of my 911s with G50 derivatives.
Downside is a bit balky when cold.
Upside is excellent warm and hot performance.

Last edited by Spyerx; 04-21-2016 at 10:00 PM.
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Old 04-21-2016, 01:53 PM
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Would delvac be ok for the c4 front diff too?
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Old 04-21-2016, 01:57 PM
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HalV
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Originally Posted by FormulaRX View Post
Would delvac be ok for the c4 front diff too?
Yes
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Old 04-21-2016, 06:58 PM
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kokolyia
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I don't see anything for Mobil delvac g50. Do you mean SAE 50?
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Old 04-21-2016, 07:49 PM
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crg53
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I am sure he meant API GL-5

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Old 04-21-2016, 10:00 PM
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Typo.
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Old 04-21-2016, 10:37 PM
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kokolyia
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Thanks for the advice!
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Old 04-21-2016, 11:34 PM
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Anyone uses Redline NS 75w-90?
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Old 04-22-2016, 02:58 AM
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John McM
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Originally Posted by kokolyia View Post
Good morning, so I found out (unfortunately while driving) that my adjustable bearings in my gearbox had disintegrated and got that fixed over the weekend so there is no more crunchy shifts. However it is still difficult to shift (and the clutch pedal is rather stiff). Especially into first. I'm thinking it could be the transmission fluid. What fluid do you recommend? P.S. I have a C4
I have the T shirt on C4 box rebuilds and my shift is like a knife through butter in all gears now so that's what they are like new/sorted. I'm using Swepco oil but I don't think the oil makes a lot of difference.

If it's not going into gear it could be worn bushes in the selection arms going to the box. It could also be very worn gearbox or engine mounts upsetting the selection geometry. Equally the clutch might not be releasing fully.

After that you are inside the box with any number of parts that could be worn. How many miles on the box so far?

To do any serious gearbox work you need to take out the engine and box. By doing that you would know how good the clutch is because it is exposed when the box and engine are separated.

Btw I have to ask what are the adjustable bearings in your gearbox? I've never heard of that
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Old 04-22-2016, 09:13 AM
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cobalt
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If you have an LSD make sure it has friction modifiers. Most do but not all yiou can add modifiers as well.
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Old 04-22-2016, 09:47 AM
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fenixv8
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Would an 80W 90 be too much for a c2?
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Old 04-22-2016, 09:53 AM
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LM964
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+1 Swepco 201 (80W-90) and a C4. Since switching to this a few years ago the gear selection just seemed smoother when hot..
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