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Index > Engine/Drivetrain > Thread: 1977 REPU 5 speed trans?
Thread: 1977 REPU 5 speed trans?
JD466


1st Gear
Posts: 14
posted October 08, 2013 03:10 AM

1977 REPU 5 speed trans?

I just installed a new clutch in my 1977 REPU and need to refill the 5 speed trans with fluid. I am not quite sure how to go about doing it and was wondering if somebody can let me know the easiest, and cleanest way to go about it. Also what type of fluid do I need to use?

Thanks,
JD

       
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Brad


Rotorhead
Posts: 1665
posted October 08, 2013 10:13 AM

There is a fill plug on the drivers side of the trans, after the bellhousing towards the middle more or less. It should be 4 sided plug.

Easy and fast would be to get some clear tubing, stick one end in that hole, the other go up to a funnel you hold in the engine compartment.

Or you could buy a hand pump and pump it up from below, but my arms always got tired. But it worked and the pumps are cheap.

If you're creative and have an air compressor, even the tire inflator type, you can do what I did. Run a clear tube thru the lid of a bottle of fluid. Thread onto bottle. One end of tube in bottom of fluid bottle, other end in the fill hole. Now, you also put an air fitting onto the lid of the bottle and hook your air compressor onto it. Air pushes fluid into tube and into trans. Fills much quicker than pump or gravity method.


For fluid, you need something that is GL-4. Which is hard to find it's an old spec and most fluids you find at stores is GL-5 or MT-1 or something like that which is supposed to be backwards compatible but is not. GL-4 has less sulfur and is brass synchronizer friendly which newer specs are not.

NAPA sells Sta-Lube brand GL-4 85w90 weight which is cheap and shifts great once warmed up. And you can use it in the rear end to, so I bought it by the gallon.
http://www.napaonline.com/Catalog/CatalogItemDetail.aspx/Gear-Oil-Automotive-1-GAL-CRC-85W90/_/R-SLRSL24239_0006410049

I've been using Redline MT-90 it is a phenominal fluid, shifts like butter cold or hot and is a GL-4 lube. Expensive but worth it. And they sell it by the gallon.
http://www.redlineoil.com/product.aspx?pid=46&pcid=7

Do not use Royal Purple, it eats the brass synchros and many Mazda owners regret using it.


       
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JD466


1st Gear
Posts: 14
posted October 08, 2013 10:24 AM

Thanks, that helps me out alot. I know of the plug you mentioned I noticed it when I was putting the transmission back in, but I had thought that maybe that was a overflow and that the fluid got dumped in somewhere else. I am guessing that it gets filled to the bottom of that plug?



Thanks,
JD

       
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Brad


Rotorhead
Posts: 1665
posted October 09, 2013 09:07 AM

Yes, fill to the bottom of the plug. Just like how you fill the diff.

       
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