Harley rear end & transmission fluid

San-Newbe · 09-18-2018, 06:45 AM

I have a 1975 HD three wheel cart and have a question about fluids for the rear end. In the manual I downloaded it says to use 40oz HD transmission Lubricant but other posts I've read online says to use gear oil 75/90. Any thoughts from others that have used either and had good luck? I also read that the wet clutch needs 12oz of HD transmission fluid. I have rebuilt mine and used transmission fluid that I had left over from my car and it seems to run fine. Thoughts (gear oil or transmission fluid)?

Thanks!

Lochlin · 09-18-2018, 12:15 PM

You are spot on with the transmission fluid. The key there is that the fluid has to be thin enough to move toward the outside edge of the clutch somewhat quickly but not so think that it leaks.

The rear diff is more straightforward. You won't find the HD transmission fluid anymore. Gear oil is the same stuff. I use 85w but only because that's easy to find. Anything in that 75w - 90w range will work just fine.

San-Newbe · 09-18-2018, 01:45 PM

Thank you. I'll fill it up this weekend and give it a go. I appreciate your input.

09-18-2018, 06:45 AM	#1
San-Newbe Not Yet Wild Join Date: Aug 2018 Location: Asheville NC Posts: 8	Harley rear end & transmission fluid I have a 1975 HD three wheel cart and have a question about fluids for the rear end. In the manual I downloaded it says to use 40oz HD transmission Lubricant but other posts I've read online says to use gear oil 75/90. Any thoughts from others that have used either and had good luck? I also read that the wet clutch needs 12oz of HD transmission fluid. I have rebuilt mine and used transmission fluid that I had left over from my car and it seems to run fine. Thoughts (gear oil or transmission fluid)? Thanks!

09-18-2018, 12:15 PM	#2
Lochlin Gone Wild Join Date: May 2011 Location: Pittsburgh Posts: 2,948	Re: Harley rear end & transmission fluid You are spot on with the transmission fluid. The key there is that the fluid has to be thin enough to move toward the outside edge of the clutch somewhat quickly but not so think that it leaks. The rear diff is more straightforward. You won't find the HD transmission fluid anymore. Gear oil is the same stuff. I use 85w but only because that's easy to find. Anything in that 75w - 90w range will work just fine.

09-18-2018, 01:45 PM	#3
San-Newbe Not Yet Wild Join Date: Aug 2018 Location: Asheville NC Posts: 8	Re: Harley rear end & transmission fluid Thank you. I'll fill it up this weekend and give it a go. I appreciate your input.

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