Ring gears and pinion gears always have to be changed as a set. Don't mix
and match.
I believe (could easily be wrong on this) that the truck pinion is longer
than the roadster one and therefore won't fit into the roadster housing.
Swap the side gears from the roadster diff into the truck housing and you
can bolt that one in with the 4.375.
But with a KA24, I doubt if you'll need such low gears unless you are
autocrossing or running very large tires. I'd go with the 3.70 if you have
one lying around, otherwise use the 3.889.
Gordon Glasgow
Renton, WA
www.gordon-glasgow.org
> -----Original Message-----
> From: owner-datsun-roadsters@autox.team.net
> [mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of Morgan Smith
> Sent: Friday, February 28, 2003 6:42 AM
> To: datsun roadsters
> Subject: rear end gearing x-mac-creator="4D4F5353"
>
>
> Hi all.
> I have a 3.889 from a 510 wagon/roadster h 190 pumpkin and a truck
> pumpkin with a 4.375 ring gear. I want to change the internals from one
> to another. The 4.375 has 35/8 ratio and the 3.889 has 35.9 ratio.
>
> My question is can I change the "whole" inside (to get the
> wagon/roadster axle size as the truck axle is bigger) , ? Is only the
> pinion different? will the ring gear teeth match up from the 8 pinion to
> the 9 pinion? Or should I change the ring gear too?
>
> Also would a 3.7 , 3.9 or 4.375 be better for a roadster? ( it will have
> a ka24e/5 speed).
> Thanks in advance,
> Morgan
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