Roadster diffs are called H-190's. They were used in the 510 wagon (WPL510)
and pickups from the 520/521 through to the 720's and D21's. There are a
couple of different variants. Some of the pickups used a cast iron third
member - instead of aluminum - which has larger pinion shaft bearings. I
don't know if it is "Stronger" than the stock H-190 type I diff. The late
pickups used another variant that has a stronger cast third member and 12mm
ring gear bolts. That unit should be stronger than the stock part. I
believe that they all interchange as assemblies but I'm not positive. Some
one on the list may know more. The internals do not all interchange. You
could pick up a used one from a junk yard in almost any Datsun pickup
through about 1986. You'd just need to be careful about the ratio and make
sure it's not a type C (I think that's what they called it) which replaced
the H-190 and as I remember had a removable rear cover like a GM diff.
If you are making more than 200HP/Torque you may want to look into having a
ford 8 or 9 inch narrowed. As Mike said, there easy to come by and lots of
folks narrow them so it's not a real esoteric sort of thing. Pick up a Hot
Rod magazine and you'll see ads for companies that do that sort of work.
You should be able to find a shop locally that does it. Look in the yellow
pages under drive shafts or axles.
Brian '69 2000
Tampa, FL
http://web.tampabay.rr.com/oilleak/
-----Original Message-----
From: owner-datsun-roadsters@autox.team.net
[mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of Leonard Sprague
Sent: Wednesday, August 21, 2002 6:37 PM
To: datsun-roadsters@autox.team.net
Subject: rear differential help needed
Hello List,
Please help. I've been reading about this all day (and not getting any work
done either) and I'm even more confused than when I started.
My roadster has been "upgraded" and now has a VG30 engine and transmission
(from an '86 300zx). I'm thinking about the rear differential and wanted to
know if anyone had any recommendations for alternatives to the 1600's stock
differential.
BTW, what IS the stock differential in a '69 1600 anyway?
I'm trying to find out the following:
- which differentials I can use?
- what size would be optimal?
- where to get one?
Someone had mentioned Subaru diffs??
How about an R-200? Will that fit?
Oh, in case it matters, I have:
195/50ZR15 Bridgestone Potenza RE730 Gen. 2
Any help would be greatly appreciated. Thank you everybody!
(Thanks for the awesome pages Gordon... and others!)
-Lenny
'69 1600/VG30
http://rabbit.circa.ufl.edu/gallery/roadster
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