Can anyone tell me the difference between a Harley #37781-07 pulley and a #40374-07 pulley? They are both 66 tooth pullys and appear to be on 07 touring models.

 

For starters, 37781-07 is wrinkle black and 40374-07 is chrome.

 

Is that the only diff. I've seen both on ebay that look the same and the local dealer says they don't see the 37781-07 in their books but the bike needs a 40217-07. I thought harley would be a little more consistant on their part numbers, however, they are confusing me. By the way I have a 2007 flhp and the 37881-07 is tha one on it and the chrome is peeling off of the teeth.

 

Are you looking for a cush drive pulley or one hard mounted to the wheel? In 07 it was an option, in 08 cush drive was standard. 07s and 08s are sort of orphans, the design of the cush drive hardware changed in 09 and they also went with a 68 tooth pulley. I believe that 07 was the first year for the 6 speed "cruise drive" transmission and it was geared just a bit too high for the touring bikes. In 09 they went to a 68 tooth rear pulley and the gearing was pretty good and has remained unchanged since. There is an export Sporty 68 tooth pulley that works with the 07 and 08 cush drive set up. I have the part number for the crinkle black 68 tooth pulley and the long collar bearing that goes with it if you are interested. That 2 tooth change improved the drivability and fuel economy of my Road King. Caution, it makes the speedometer read even higher above your actual speed than the built in factory error. That error can be corrected in at least 3 different ways. I did the poor man's free fix but that requires taking the glass off the speedometer, a job I have done before so I wasn't afraid of it. There are speedo correctors on the market and a tuner that lets you reprogram the pulse rate on the speedo will fix it also. Lots of money for either of those options.

 

I guess the bottom line on what I'm asking is will the 40374-07 replace the 37781-07 with no problems. There is a decent diff. in cost on ebay.

 

Can't answer your question but have one of my own. Does your handle reference a Ford product of the '69 vintage. I have fond memories of the Cobra Jet versions.

 

Yes I am the original owner of a 69 Mustang Mach 1 with a 428 cj. I totally restored it when I retired in 07.

Still hoping some one can answer my pulley question.

 

Whenever I have a question about HD part numbers and the differences between them, the guys at the parts counter at my local HD dealer are always more than willing to research and answer my questions, even if I don't buy from them. Maybe a phone call, to a different dealer is all it takes. It sounds like your dealer searched by model (FLHP) instead of the part number. For example, the Japanese Sportster 68T will not show up in their book, under (FLHP), since that is not the model it was intended for.
A lot of good info has already been put forth in this thread even though your original question still hasn't been answered.
I suspect the color/finish is the only difference. Other than that, as far as I know, the optional cushdrive that was first offered as an option in '07 and the Japanese Sportster 68T rear pulley is all that was available.
I agree that moving to a 68T rear will immensely improve the gearing on your '07. It will give you a much needed boost "off the line" and still leave more than enough "top end" without that much of an RPM increase.
HD recommends replacement of the bolts when changing out the rear pulley because achieving the proper torque is difficult unless all the old thread locker has been removed with new thread locker applied. If you've ever done that, you know its better to just replace them.
Good luck and for the benefit of future searches, please post the answer to your original question, when you find out.

 

Will do and thanks for your reply.

 

Update, I never found out the diff. however I found a near new 37781-07 on ebay at a good price. If I should hear any info on the diff. I will reopen the thread.