Question about 2003 Harley Davidson FLHTCUI Electra Glide Ultra Classic

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My 2003 ultra classic is leaking transmission fluid at the top ?

My 2003 utra classic is leaking transmission fluid at the top of the transmission> i know because i used red line and its red. Just had it changed. It appears to be the top rectlanguar cover on the top. Could it be something else before i replace the gasket on the top cover?

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  • 2 Answers

It's a Harley, it's supposed to leak somewhere.

Posted on May 15, 2014


6 Suggested Answers

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Posted on Jan 02, 2017

  • 469 Answers


Most are using Syn3 oil in engine, tranny, and primary.
This simplifies this, and is a decent oil.
32oz of oil in primary.
20-24oz of oil in tranny
99851-05 primary case/ trans oil(Conv Oil)

there are other brands that surpass the syn3 oil but it takes some hunting around to find a supply.
Ammsol is one such brand and they recommend.
20w50 engine
15w40 primary
75w90 tranny

Hope this is of some assistance

Posted on Apr 20, 2009

  • 152 Answers

SOURCE: 2002 Harley Ultra Classic backfires

Sounds like the previous owner didn't get the cpu remapped, Take it to a Harley dealer and have him check the exhaust mapping on the cpu, Shouldn't cost much or if you want get them to fully service it so that way you will know were your at with it and will have a reference point to start with or service and maintenance reasons (and re-sale value) Hope this helps

Posted on May 18, 2009

  • 119 Answers

SOURCE: 2003 Ultra Classic engine backfire when upshifting

go to basics replace the sparks

Posted on Oct 20, 2009

  • 269 Answers

SOURCE: My 2003 harley ultra classic has cruise control

On your throttle cables on the left side of the bike at front of the bike just ahead of the gas tank you will see a "bulge" where the connector is for cable position/sensor plugs in. check this connection first, clean it, etc. plug things back in and test it.
Please post and let us know if this helps.


Posted on Nov 19, 2009

Testimonial: "I did what you asked to do and it seems to have fixed the problem. I tested it on a ride and had no trouble. Many thanks to solving a problem."

  • 1 Answer

SOURCE: Primary Cover Problems

I'd be careful with the heli-coils. Once in they can really be a problem to get back out once they're in place and go through the heat and cool process for awhile

Posted on Feb 06, 2010

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How to replace front right side top gasket on 2003 Harley ultra classic not rebuild or replace any parts not in service manual

Hi, Patrick I just read the comment you left me it appears there is some confusion about the gasket in question are you talking about the top engine gasket (rocker cover) or a tappet block gasket or a transmission cover gasket and do you have a service manual? For more specific information or questions at no charge please feel free to contact me at Good luck and have a wonderful day.

Feb 10, 2017 | 2003 Harley Davidson FLHTCUI Electra Glide...

2 Answers

My 2003 hd ultra classic is leaking trans. fluid at the top of the trans. what do i do?

first spray it all clean with brake parts cleaner, careful not to spray on starter. then start it up go around the block and verify where the leak is, if its the top cover get a gasket replace easy fix five bolts. now if your leak is coming from the nipple or short hose thats on the left side of top cover thats a vent and this indicates the tranny is over filled with fluid.

May 12, 2014 | 2003 Harley Davidson FLHTCUI Electra Glide...

1 Answer

Wheres my transmission drain plug on my 2003 electra glide classic

right side under the transmission 5/8 inch hex plug about midpoint of the transmission.

May 11, 2014 | 2003 Harley Davidson FLHTCUI Electra Glide...

1 Answer

What is the transmission oil capacity for a 03 flhtc ?

Transmission fluid
(Ounces, approximate)

20-24 20-24 20-24

May 04, 2014 | 2003 Harley Davidson FLHTCUI Electra Glide...

1 Answer

My 03 ultra classic is leaking trans fluid they say its a $1 dollar o ring that cost about $600 to fix?

First off, determine if it's transmission fluid, or primary chain case fluid.
I had the seal on the transmission main shaft go on me once (the seal under the transmission rear drive pulley, behind the inner primary cover).
This can be changed with the transmission still in the bike, but the entire primary needs to come apart, and the transmission sprocket/pulley removed to access it.

If it's primary fluid, it's probably the seal on the inner primary case that the transmission shaft runs through and that the clutch assembly bolts to.
Again, the entire primary needs to be torn down to access this.

Either way, the cost of the part isn't bad, but the labor is the killer, as it's a 6-10 hour job, if I remember the book's quote.

Mar 18, 2014 | 2003 Harley Davidson FLHTCUI Electra Glide...

1 Answer

How many quarts of oil for 2003 harleydavidson ultra

Hi Anonymous, oil capacities on touring models:
1. Engine oil 4 qts. with filter Hd Multi Grade 20w50.
2. Transmission oil 20-24 oz HD Transmission Lubricant.
3. Primary oil 32 oz. HD Primary Chaincase Lubricant.
Have a nice day.

Nov 11, 2012 | 2003 Harley Davidson FLHTCUI Electra Glide...

1 Answer

2002 ultra glide transmission fluid

Hi Anonymous, 20 to 24 oz. HD Transmission Lubricant. Have nice day.

Aug 26, 2012 | 2002 Harley Davidson FLHTCUI Electra Glide...

1 Answer

My headlight goes bright for a few seconds on a 05 ultra then goes back to normal.

There is a wiring problem.

Check first to make sure that the wiring is not shorted out anywhere in the lighting harness, then chack that all your grounds are connected well, not corroded or broken

this is the most commom causes for your problem.

Aug 17, 2011 | 2005 Harley Davidson FLHTCUI Utra Classic...

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