[Roadsters] Differentials

[David Patten]

If you really want some stump pulling acceleration find a center section
from a 521 or 620 pick-up. The L16 to L20B trucks came with 4.375 gears.

You will need to swap the side gears from your Roadster diff, but it is a
simple process.Mike Klotz posted a thread on Ratsun with video showing the
details.

Mike's Ratsun H190 Side Gear
Swap<http://community.ratsun.net/topic/10748-h190-spider-gear-swap/>


Thank you,
Dave Patten, Owner


*FutoFab, LLC*
199 Stark Hwy So
Dunbarton, NH 03046

Website - www.FutoFab.com <http://www.futofab.com/>
e-mail - dave at futofab.com
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On Fri, Feb 14, 2014 at 7:24 PM, Joe Russo <jrusso07 at rochester.rr.com>wrote:

> I run a U20/ 5 spd in a 1600 car (with the stock differential). Much
> quicker
> than the SRLs I have. the RPMs are not bad in 5th gear at speed on the
> highway. Much lower than my 240z 4 speed Top speed 103.
>
> Joe
>
> Sent from my iPad
>
> On Feb 14, 2014, at 6:22 PM, Bill Cole <datrock at centurytel.net> wrote:
>
> > Yes, you will feel the gear change, also going to a smaller diameter tire
> will have a similar seat of the pants feeling of having more torque. The
> R&T
> articles from the late 1960's has a new 1600 at 12.1 seconds while the S/U
> 2000 did 10.2 seconds in the 0-60 mark. I would bet on it that if the 1600
> used the 3.70 gears like the 2000 has, the time would be even slower..The
> 3.90's from the 1600 are a great match up for the u20/5speed combo, if the
> 3.70's are swapped out for the 3.90's also expect to need a different
> speedo
> pinion at the tranny to correct the speedo reading on your gauge...Bill
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