Then watch this video.
After that SEARCH!
If you haven't found the answer, chances are we'd love to discuss the topic in depth beyond any depth and relevance you thought possible.
Now, ask away
OK, So I'll do my best to keep this an organized information bucket.
I'm hoping, along with all you guys, that we can get all the repeated questions answered before their asked...like the favorite...What does it take to put a 5-speed in my 620? and any other FAQ that we answer over and over and over and over...
So if you know the answer, the question or know of a relevant thread post up. I will edit the thread as needed to consolidate and keep it tech only.
This should be all the models to start with. Hopefully, eventually we can break it up for each section.
Here's a my start...I will just keep editing my post as I find relevant threads...of course, my finds will prolly be a bit truck biased
If you don't own one, this should be your first purchase after choosing a Datsun
[EDIT: the green Haynes manual for 510, pl521 pictured has an incorrect page.The wiring diagram is actually a 620.]
Relevant and Informative Links
BRE's most awesome tech site
This link contains FSM (Factory Service Manuals) in pdf form for the 320, 520, 521 & 620. Download yours, print it and read it.
I recommend browsing the entire site, good stuff
I also recommend a donation to help keep this resource available. Paypal is accepted through http://www.olddatsuns.com/
[EDIT: the620.com pdf 521 wiring diagram is wrong. It looks to be copied from the haynes green 510, pl521 manual which pictured above. Hopefully some can supply a for that correct]
Bleaches Site (Time to do some updates buddy )
Hainz L Series Video - Watch and learn, then watch it again
L head gasket replacement Pt1
L head gasket replacement Pt 2
L head gasket replacement Pt 3
L head gasket replacement Pt 4
L head gasket replacement Pt 5I
From the old sticky for tech links - thanks for getting us started PAC
Tech Link Tread
HEI EI dist. swap- http://zhome.com/ZCMnL/tech/gmhei.html
SU info & tune up specs- Hitachi S. U. Tech Pages
Finelines - Disc brakes for your Kingpin Truck
Glengemans - Front Disc & Ball Joint Swap
Custom Upper Control Arm Method
L Series Info
Head bolts - cheapest I could find anywhere...local dealer wanted $120 for the L20 set....got a few extra with this and they're the turbo bolts...
Engine Swap Info
How to wire a KA CA SR and VG into anything.
KA24 Swap Info
Icehouses 620 KA Swap
SR20DET Swap info - Yep, it'll fit
makibakas DGRfab 521 SR20DET
Roostmonkeys SR20DET swap
Transmission Gear Ratios
Type 1st 2nd 3rd 4th 5th Year Range
AT 3 2.458 1.458 1.000 1973-79
MT 4 3.657 2.177 1.419 1.000 1973
MT 4 3.592 2.246 1.415 1.000 1974-79
MT 5 3.321 2.077 1.308 1.000 0.864 1977-78
MT 5 3.592 2.246 1.415 1.000 0.882 1979
Rear Axle Gear Ratios
Ratio model Year Range
4.375 MT 4 & 5 speeds through '78
4.625 AT Sept 1973 to July '75
4.375 AT Aug. '75 through '79
4.11 MT4 & MT5 '79 only
Came with 13 spline side gears on very early trucks/cars.
More common 23 spline side gears used on Roadster*, 510 wagon*, 610 wagons from Sept. '73, all 810 and Maxima gas/diesel wagons.
All 29 spline were on the 520*/521*/620*/7202wd and 4x4 to '83, '82-'83 S110 (200sx) and the '84 S12 (200sx)
* aluminum case, used only on the earliest 620s.
Ratios range from 3.364, 3.545, 3.70, 3.889, 4.11, 4.375, 4.625 to 4.875
Yes, there is a Limited Slip Differential available for your truck.
Found another LSD. It's built by Auburn gear.
www.reiderracing.com $400 Its a precision gear power brute. They sell two parts for the same axle depending on what gear ratio you are running. One with and one without a 4mm spacer. The one without the spacer will accomodate 4.11 to 4.62 gears and the one with the spacer will go for 4.87 to 5.42. You have to use the later model gears with the 12mm ring gear bolts though. Its still cheaper than having an axle cut to fit the narrow pickups.
This is a link to one for $499.99
ARB also offers a selectable locker for the H190
Fit those big wheels.
Newer wheels require some work to fit on our trucks. You can either machine the wheels to fit over the hub, run 1/4" spacers or machine your hubs so that any newer wheel will fit.
Machined 620 ball-joint hub (this will work on king-pin hubs as well)
Will Titans Fit?
Yes, here are the measurements...
Pics, cause their fun
Measuring off set...
Wheel (true) width...
Lug nut info - Thanks Hainz
stock are 42mm front
40222-RS035 front 50mm 14.3 x 36t serrations
40222-RS045 front 60mm
40222-RS015 rear 50mm 13.0 x 36t serrations
40222-RS025 rear 60mm
example here I dont know whats in a set ,i got this on the Z car section
everbody record this but remeber the 521 trucks use 7/16 lug nuts so these will be M12x1.25 metric
620 Dash pic's
90 AMP Alternator swap for a L series motor - Page 3 is meat n taters
Where to get parts for your Datto