Stick shift not shifting into a gear when driving?

Cyber370

Yeah. I was gonna bring up the tranny fluid. Are you sure the right type and viscosity of fluid was used? That’s if it was ever changed. If not, then try changing it.

Wrong tranny fluid (if too slippery) can cause synchro issues.

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NissanZ34

Hello. I am having the same issue as OP.

I have just purchased some Redline Mt-85 and Redline 75w90. I am wondering if my transmission (synchros) is/are about to give up or I may just need a good oil change.

My car has about 30 000 miles but I beat on it pretty good. The car was shifting fine when I first got it but after 3500 miles it shifts clunky now.

The dealership mech said it's probably the synchros. They are able to order 1&2, 3&4 and 5&6 synchros in a "2 gear pack" or simply the whole transmission assembly. The synchros are back order at the moment but the transmission assembly is available for order but it's 2500$ though.

Redline fluids cost an arm so I'm wondering if I should just keep driving the car as it is for this season, OR have the transmission fluid changed for the oem oil for this season see if it helps in any way OR report the transmission swap for next season and have brand new oil and transmission together OR change the fluids now and hope for the best.

I really would not like to waste that Redline oil.

I thought my transmission rebuild would have only happened under forced induction... oops

Thanks for helping me out.

SouthArk370Z

Then it's time to change the trans lube. There's a good chance it will make your problem better and may even fix it.

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NissanZ34

Cool. Do you think I should use my high end Redline MT-85 or use the factory oil? I asked them and they said it's 75w85. Can you confirm that?

By using the factory oil I could try and see if the oil change fixes anything, at a lesser expense. I would keep the better quality oil for later on.

SouthArk370Z

There are many threads comparing/contrasting the many different lubes available. You can use the site's search (sucks, IMNSHO) or go to just about any web search engine and add "site:the370z.com" to your search string. It can go before or after your search string, just make sure to add a space between them.

Don't cheap out on trans lube - or any other lube, for that matter. If you have some OEM stuff laying around, I'd go ahead and use it. But, considering that you drive the car hard, I'd change it out every 20k miles or so.

You can get better (smoother, quicker) performance from some of the racing lubes. For your circumstances, this may be an appropriate choice. If ya wanna play, ya gotta pay.

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JARblue

FTFY


NissanZ34, yes, use the MT-85. That is the appropriate transmission fluid for the 370Z.

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SouthArk370Z

Thanks! I edited the post.

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Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma