Any ideas?

[Chickenman]

2 hours ago, Zed Head said:

I'm jumping between threads here.  How could you have those ratios on an L6 engine unless somebody swapped bellhousings?  Or swapped gear sets?  Just asking.  Maybe George knows.

1977 and  Datsun 620 PU's ( L20B engine ) came with an optional  FS5W71B, as did early 720 PU's ( 1979.5 to 1980 ) which came with an L20B and a 5 speed option. 1981 Model year was the introduction of the Z20S NAPZ engine.

The Truck FS5W71B's  had stump puller gearing. Really short first gear ratio and 4.375 rear end gears. 

https://en.wikipedia.org/wiki/Datsun_Truck

Quote

The standard transmissions were the F4W63 four-speed (1972 and 1973) and F4W71 four-speed (1974 to 1979). In 1977, the optional FS5W71B five-speed manual transmission became available. The 3N71 three-speed automatic became available as an option in mid-1972. This was the first series to offer an automatic transmission as an option (all model series before the 620 only had manual transmissions). Final drive gearing was 4.375:1.

 

Edited February 24, 2016 by Chickenman
Wiki link

[Zed Head]

One option.  That would be the short tail-shaft transmission then, I believe.  Maybe.  Requiring a longer propeller shaft.  Wouldn't be a giant surprise.  People were modifying the cars soon after they were introduced.  20+ years is only about mid-1990's.  All the Z's were old by then.

zhome shows that my competition trans comments might be off.  But also shows the 720 with a 3.6 first.  Could be truncating instead of rounding though.  Maybe 3.592 = 3.5.  http://www.zhome.com/ZCMnL/tech/GearRatios.html

[Boomguy]

K kind of thought #1 Trans in that post most reflected what George told me. I may pick up a 3.53 r200 from a guy that I know just to make 1st a little more usable.

[Matthew Abate]

Too bad you and Mr. Abate are on opposite coasts.  He's looking for those ratios.

Close! I'm looking for the #3 ratios with the shorter second gear to minimize the possibility of ending up coming out of first gear to soon because I plan to put a LS Subaru r180 in the back.

Kind of thought #1 Trans in that post most reflected what George told me. I may pick up a 3.53 r200 from a guy that I know just to make 1st a little more usable.

There are a handful of WRX STI 3.545s on eBay right now...

BTW, what's your driving style, Boomguy? Fairly aggressive?