Datsun Roadster Forum-311s.org

Does anyone know the part numbers for the competition leaf springs and the stock leaf springs?
Thanks,
Ron

Ron,

I do not have the part numbers but I would recommend against putting the competition springs on the rear. They really are to darned flat and lower the rear end considerably. Just retrofit your springs with the urethane bushings. Trust me you will feel the difference.

Steve

If you are interested in the comp rear springs, they are still listed in the NISMO parts catalog. My local dealer got them for me in about a week, and when I decided I didn't want them, I sold them on eBay for more than I paid for them!

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Thanks All,
I'm asking because I picked up a set of leaf springs with part number 55020-25500 NGK. My leaf springs are shot and already have been reinforced by the PO. So these are going in anyway. Just wanted to know for sure what I have.

Alving,
I see your comp #s are real close to mine.

Ron

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By close I meant that I accepted yours as the real thing. I got mine with a parts lot, and though they were supposed to be from a Roadster, who knows!

I'm hoping that mine, being a similar part number, might be some sort of variation of the stock or comp springs.

BTW Alvin, I sent you an email regarding the cutting of your springs. How are they?
Ron

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Ron

The parts catalog lists Part # 55020-25500 as the rear spring assembly for all 1600's and 2000's, so I guess that means it will fit from a 67.5 up? I can still read the white numbers on the top of the springs of my 68 2000 parts car and it also says 55020-25500. ':shock:' I was told by the PO they were stock rear springs. Hope that helps.

Mark

The suffix 25500 is the common suffix that Nissan used to denote components destined for the redesigned Fairlady (the 2000 specifically, but also the 1600 when the part was common), so based on that Mark is right on the money. Typically, Nissan would list the performance item or the modified version using the suffix 25510, but like everything, there are loads of exceptions...

For the record, the early spring part number is 55020-10500 (that is for 1600s through engine R-40000 - or prior to the 67.5 model) while the other part number of 55020-25500 is for the later 1600s (67.5 and later) and all 2000s.

I don't have the part number for the 1500. Never got those parts books...

I have not driven a roadster with the comp springs, so I cannot comment on it. I can tell you that the later roadsters do have a little better ride than the earlier since the -25500 spring is softer than the -10500 spring. With some good shocks, I would say it is the way to go. A lot of racers reported that the comp springs were too stiff even for some tracks, and they modified them by removing some leaves. The Bob Sharp manual talks about it too. Your mileage may vary though...

I can only find 3 part numbers for the rear springs in my parts books.

55020-10500 stock for the 1.6L up to E#400000

55020-25500 stock for the 1.6L from E#400001 and 2.0L (spring rate 2.52kg/mm)

55020-25510 (for racing car) found in the 68-70 Japanese&English parts book.

Ray B.

Sid:

The classification suffix in part # 55020-105XX the 105 is part type for vehicle type SPL310. (per Table B14 of parts book).
So the part was originally designed for the SPL310 model.
The last 2 digits XX is a distinction number to indicate the difference between any similiar parts of the 55020-105 base number. (i.e. exclusive service uses distinction numbers 25 thru 29 or 75 thru 79)

Ray B.

Wow. You guys are a veritable encyclopedia.

Well it looks like I've got the stock springs. As a matter of fact the rear does seem to sit very well. My 14x6.5, 185/65/14 wheels have just enough clearance in the rear. So I guess stock will be good.

Just replaced the rear shocks with new KYB's last month, so the rear leafs should finish the job.

Now onto the front end....

Ron

Hmmmm...
I've got Comp springs front and rear and Koni's. My last roadster had stock springs and Koni's and was a bit stiff to say the least. Should I expect to have my eyeballs vibrating while driving?

As long as the bumpstops are correctly cut, the ride isn't that bad. If you have a comp oil pan, you should be mindfull of where you are driving, and what you are driving over. Large rocks can be an issue, that said, I haven't had any issues. I have lightly brushed the front of the pan once on a huge speed bump.
I don't have the rear comp part # handy, the recept is packed in a box someplace. I really don't think I need to dig it up either, looks like you guys have it covered.

Will