Datsun Roadster Used Differential Info from Rallye Enterprises, Ltd.

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USED DIFFERENTIAL INFO
Used differentials are just pulled out of a car, nothing has been done to them. The only guarantee is that they don't have broken gears. The typical problem; gear backlash (slop) is how we break them down into A B C condition. The "A", "B", or "C" are in the part number. The A's are as good as we see; unusually tight units. The B's are your typical good used rear end. An increased likelihood of whining but so far---we haven't heard back of any whine problems on the A or B condition units. The C's definitely are in the WORN category.

If trying to get rid of a "whine" problem, a used differential may be better or worse. Most cars don't whine noticeably, so the odds are you'll improve your situation, but there is NO GUARANTEE of that. The only guarantee with these is that a gear is not broken and everything turns. Depending on how they have worn and/or how carefully they were originally assembled even pretty tight ones can be louder than necessary. All we look at as far as bearings go is if they don't feel "right" when spun. Generally the units that have little wear to gears have had little use to the bearings or at least good clean oil throughout their life; but it is not guarantee.

Usually the only correct way to reduce whine is to replace or rebuild your unit with a new ring and pinion. Sometimes all it takes is reshimming the rear end. This is a complicated procedure for the novice; and best left to a shop that specializes in that kind of work.. You are welcome to experiment with a used drop-in unit; but keep in mind everytime one of these is shipped to you or to us YOU have lost $40-$60 in delivery and packing costs .Used differentials are exchangeable for another unit if not as described.

You may need to change a bearing in ANY used differential. If we see something obviously wrong we note it. That doesn't mean if we don't see it the problem isn't there. Differentials should be cleaned, including rinsing and blowing out the bearings. Although it goes against my nature; selling a non pristine part; the truth is if I took the time to clean everything NONE of these parts would be for sale; there just isn't time anymore. Always worthwhile to throw a new seal(s) in a transmission, differential, differential housing or timing cover when they are pulled for any reason.

On some of the differentials; including the "A" units; there can be very slight corrosion sometimes on some tips of some of the ring gear teeth. These are typically those areas that lost oil cover over the sometimes very long storage durations. Part of the reason some of the differentials are worn so little is we have some rear axle housings that have not been in a car for over 30 years; and the car could have been damaged long before that. This corrosion sometimes just wipes off or comes off easy with a putty knife; whatever; the first few feet of driving will eliminate it.

The 1600 and 2000 differentials are directly interchangeable. The 1600 has a ratio of 3.9, the 2000 is 3.7. Very rarely do we see a 4:11; which a few cars came with; and a few more have been retrofitted with. The 1500 differential can only be replaced by another 1500 unit.

Differentials as with many big or heavy parts need to be prepaid with a US Postal Money order or a $200 deposit of the same. These have been far quicker than other money orders; which can take us WEEKS to get verifiable clearance on as opposed to usually 1-3 days for a USPS money order. You can also pay for half of it with a USPS money order and the other half with a card. Email for shipping so you can get total.

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SPL311 SRL311 DIFFERENTIAL INFO from Rallye Enterprises, Ltd.