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Gearbox oil?

 
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  #21 (permalink)  
Old 04 Nov 2017, 04:41 pm
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Default Re: Gearbox oil?

I ended up using the penzoil syncromesh synthetic when I changed mine. It works good. I'm not going to say that I felt a difference or it shifts smoother or anything, but it went into gears nice and smooth b4, and after the change with the syncromesh so all is good with it. I will definitely use the syncromesh the next time I change as well.
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  #22 (permalink)  
Old 04 Nov 2017, 05:23 pm
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Default Re: Gearbox oil?

do you drive like an adult, or do you drive like me?

synchromesh is too slippery for the blocker rings to do their job in a performance application. unless you either drive like a saint, or have a cheaper trans with brass blocker rings, you shouldm NOT be using that as fluid.

synchromesh, oil, etc, is intended for this style synchro:
1.JPG

synchromesh is too slippery for this style synchro:
2.JPG

the top design has no place in a performance trans.

the bottom design stops gears quick when you shift fast. the 4 tabs on the center ring stop the gear, the splines in the center stop the shaft, the teeth on the pair lock together with the slider

the bottom design can't stop the gears quick enough with too slippery of a fluid, even though it feels fine if you drive like a normal adult. they need the added grip, and they need the detergent in the ATF to stay clean and grippy. best way to describe it is to say either fluid will work. the ATF will give you less crunching when speed shifting and the synchro teeth will wear out far slower.

3.JPG

4.JPG

5.JPG

6.JPG

7.JPG

8.JPG

or i could be wrong... i'm not a mechanic, i make signs for a living .....and just happen to break/fix a lot of transmissions

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Last edited by rob302; 04 Nov 2017 at 06:15 pm.
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  #23 (permalink)  
Old 05 Nov 2017, 12:37 am
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Default Re: Gearbox oil?

Well here is my two cents. I am now sold on the ATF+4 in my Getrag.

A few weeks ago I was doing the clutch in the PT and I had forgotten to install the pilot bushing in the dual mass flywheel and so I ended up pulling the trans twice. On the second pull, I decided on a whim to change the oil in the trans. The stuff in there was the factory fill I believe because it was burnt and REALLY stunk bad. The trans actually shifted fine and wasn't grinding but it definitely needed to be changed. Anyway I drained it out but because I didn't really intend to change the oil in it, I wasn't prepared. The only oil I had on hand was some regular Pennzoil 5w30. I put that in and drove it for the last few weeks. Well I noticed that the gears wanted to grind a bit more even when I wasn't getting into the gas. Just adult driving.

As well, with the weather becoming colder and colder here I could feel that coldness in the oil too when the trans was cold. So today I decided to change the oil. I bought a 2 litres of Castrol ATF+4 fully synthetic. I thought it would be enough but the trans actually took a bit more. The total was about 2.25 litres. Luckily I had 3/4 of a litre of Mobil Atf+4 Synthetic blend in the back of my car from the power steering filling I had also done when I dropped the trans. It would have been better if it was fully synthetic like the Castrol, but I only had to use a bit of it.

Anyway, the trans really responded well. It really loves that ATF+4 over the 5w30 I had in it previously. The shifting is much improved and no grinding of the gears. It was only one instance, but it made me a believer and I likely won't try running anything different again.

So my vote is for fully synthetic ATF+4
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  #24 (permalink)  
Old 05 Nov 2017, 01:49 am
_PTGT03's Avatar
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Default Re: Gearbox oil?

Quote:
Originally Posted by myckee View Post
Well here is my two cents. I am now sold on the ATF+4 in my Getrag.

A few weeks ago I was doing the clutch in the PT and I had forgotten to install the pilot bushing in the dual mass flywheel and so I ended up pulling the trans twice. On the second pull, I decided on a whim to change the oil in the trans. The stuff in there was the factory fill I believe because it was burnt and REALLY stunk bad. The trans actually shifted fine and wasn't grinding but it definitely needed to be changed. Anyway I drained it out but because I didn't really intend to change the oil in it, I wasn't prepared. The only oil I had on hand was some regular Pennzoil 5w30. I put that in and drove it for the last few weeks. Well I noticed that the gears wanted to grind a bit more even when I wasn't getting into the gas. Just adult driving.

As well, with the weather becoming colder and colder here I could feel that coldness in the oil too when the trans was cold. So today I decided to change the oil. I bought a 2 litres of Castrol ATF+4 fully synthetic. I thought it would be enough but the trans actually took a bit more. The total was about 2.25 litres. Luckily I had 3/4 of a litre of Mobil Atf+4 Synthetic blend in the back of my car from the power steering filling I had also done when I dropped the trans. It would have been better if it was fully synthetic like the Castrol, but I only had to use a bit of it.

Anyway, the trans really responded well. It really loves that ATF+4 over the 5w30 I had in it previously. The shifting is much improved and no grinding of the gears. It was only one instance, but it made me a believer and I likely won't try running anything different again.

So my vote is for fully synthetic ATF+4
nice to hear some actual data from experience rather than theory flame wars
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  #25 (permalink)  
Old 06 Nov 2017, 08:33 am
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Join Date: Mar 2017
Location: Kokomo Indiana
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Default Re: Gearbox oil?

Quote:
Originally Posted by rob302 View Post
do you drive like an adult, or do you drive like me?

synchromesh is too slippery for the blocker rings to do their job in a performance application. unless you either drive like a saint, or have a cheaper trans with brass blocker rings, you shouldm NOT be using that as fluid.


Hmm....this could be true.

synchromesh, oil, etc, is intended for this style synchro:
Attachment 25874

synchromesh is too slippery for this style synchro:
Attachment 25875

the top design has no place in a performance trans.

the bottom design stops gears quick when you shift fast. the 4 tabs on the center ring stop the gear, the splines in the center stop the shaft, the teeth on the pair lock together with the slider

the bottom design can't stop the gears quick enough with too slippery of a fluid, even though it feels fine if you drive like a normal adult. they need the added grip, and they need the detergent in the ATF to stay clean and grippy. best way to describe it is to say either fluid will work. the ATF will give you less crunching when speed shifting and the synchro teeth will wear out far slower.

Attachment 25876

Attachment 25877

Attachment 25878

Attachment 25879

Attachment 25880

Attachment 25881

or i could be wrong... i'm not a mechanic, i make signs for a living .....and just happen to break/fix a lot of transmissions


Hmm... this could very well be true. I am anything but easy on my pt. I drive the shit out of it. So far I have about 20k on the syncromesh and no issues yet but you have made me worry enough to do some research that's for sure. Thanks rob302 for the info. Good looking out.
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