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Old May 24, 2017 | 04:56 PM
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what kind of transmission oil goes in a 1988 heritage softail 1340cc?
 
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Old May 24, 2017 | 05:35 PM
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I used HD's Formula Plus in the tranny and primary.
 
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Old May 24, 2017 | 06:46 PM
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Tranny , I use Lucas gear oil
 
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Old May 24, 2017 | 07:36 PM
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85W-140 Hypoid gear oil.
 
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Old May 24, 2017 | 08:09 PM
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I use Mobil SHC-630.
 
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Old May 25, 2017 | 05:01 AM
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Redline shockproof
 
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Old May 25, 2017 | 05:08 AM
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Originally Posted by glavook
what kind of transmission oil goes in a 1988 heritage softail 1340cc?
Welcome to HDF. You will come to realise that there are more brands of oil than any mere mortal can hope to use in a lifetime! Some are suitable for our bikes and others are debateable. Your choice for any oil in your bike is almost unlimited, so to see discussion on the subject visit the Tech Oil section - but get a long drink first! Or take the easy option and visit your local Harley dealer.
 
Last edited by grbrown; May 25, 2017 at 05:09 AM. Reason: Expanded.
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Old May 25, 2017 | 07:18 AM
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Originally Posted by glavook
what kind of transmission oil goes in a 1988 heritage softail 1340cc?
Let me add my $.02 worth. I use Lucas Oil Transmission and Diff Gear Lube 75W90 synthetic, in the trans on my 1996 Harley. The brand doesn't matter, but to protect the gears you need gear oil/grease. As old and loose as the transmissions are on a bike as old as ours, 75W140 might be better. Gear oil needs to stick to the gears as they rotate and be thick enough to remain between the teeth on the mating gears so that they are not metal to metal but always have a protective film of grease between them.
 
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Old May 25, 2017 | 08:35 AM
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Valvoline 85W-140 hypoid gear oil. $6.00/qt. at Auto Zone.

I used H-D semi-synthetic transmission lube until they discontinued it.
 
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Old May 25, 2017 | 10:38 AM
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Never had any issues using the oil HD recommends for each hole on my Harley's.
 
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