1975 Datsun 620 Pickup Truck

hawaii_620 · **Posted:** Sat Jun 06, 2009 7:14 pm

I just bought a 620 Datsun truck and was searching for information on brake conversions and transmission swaps.

Currently it has:
4 speed tranny (feels very sloppy) to a L20B
Drum brakes all around

I'd like to convert at least the front brakes to disc. I've been searching the forum but haven't found any information about this topic. I'd like to find out what I parts I need for a conversion. I've seen rotors on ebay, but wanted to know more about the calipers and other parts I would be needing.

I also want to switch to a 5 speed trans. What would be a good donor datsun/nissan to look for a transmission?

Any help would be much appreciated.

john · **Posted:** Sat Jun 06, 2009 8:00 pm

hawaii_se-r wrote:

I'd like to convert at least the front brakes to disc. I've been searching the forum but haven't found any information about this topic. I'd like to find out what I parts I need for a conversion.

Easiest way to go about it is to find a '78-79 in the junkyard and take all the front end stuff off of it. All the later 620s had disc brakes in the front.

Quote:

I also want to switch to a 5 speed trans. What would be a good donor datsun/nissan to look for a transmission?

Same thing. :wink:

The late 620 5spd is one of the best transmissions Datsun ever made. :tu:

And if you get it from a 620, it should be basically a bolt-in (assuming you get the mount and driveshaft too).

hawaii_620 · **Posted:** Sun Jun 07, 2009 3:00 pm

http://cgi.ebay.com/ebaymotors/Datsun-3 ... 500wt_1219

What would be of concerns with doing something like this to my truck? Just wanted to know what the forum of JNC would think about this.

john · **Posted:** Sun Jun 07, 2009 3:12 pm

hawaii_se-r wrote:

What would be of concerns with doing something like this to my truck?

None at all Beebani's kit is well engineered and works very well. And gets you bigger brakes than stock 620 stuff, as well as service parts that are easier to find down the road. If you don't mind spending the cash, I highly recommend it. :tu:

hawaii_620 · **Posted:** Mon Jun 22, 2009 11:27 am

My original fan is broken and I don't have the original fan shroud either. Should I shop out a fan and shroud, or should I just go with an electric fan setup?

Any recommendations? or draw backs on doing one or the other?

bonvo · **Posted:** Mon Jun 22, 2009 12:31 pm

just go electric with a thermo controler i did that in my 610 and never looked back the stock fan wasent enough when it was put in by datsun now 30+ years later its really not enough

NSR_s30 · **Posted:** Mon Jun 22, 2009 7:12 pm

Any pics of the truck? :mrgreen:

hawaii_620 · **Posted:** Tue Jun 23, 2009 5:49 am

I'll get them up shortly!

Pacific coast 620 · **Posted:** Wed Jun 24, 2009 8:12 am

Pix or you dont own it :lol:

JK my friend look forward to this build.

hawaii_620 · **Posted:** Mon Jul 06, 2009 11:24 pm

I'm not a fan of the Titan rims it came with, but it will do for now.

gaijinshogun · **Posted:** Tue Jul 07, 2009 1:17 am

Cool P/U!! Looks like a great one to start with, especially in HI :tu:

hawaii_620 · **Posted:** Tue Jul 07, 2009 3:02 am

Yup, being in Hawaii, you can't just find a good deal and drive over to the next state to pick it up. It has it's fair share of work to be done to it, but over all I think it has a sound foundation.

First priority is to upgrade the front brakes to discs. The current brakes are so bad that it takes about car lengths to come to a stop.

Stealth · **Posted:** Tue Jul 07, 2009 7:42 am

i actualy like it with the titan wheels, and just kinda think its funny that they even fit. looks like a cool project

hopefully you can find something to do with the brakes

Capital15 · **Posted:** Tue Jul 07, 2009 1:52 pm

Nice truck. Those look like Armada Wheels not Titan wheels. Correct me if I'm wrong.

hawaii_620 · **Posted:** Fri Oct 16, 2009 9:45 pm

I finally got around to doing my front disc brake conversion. Parts bolted up smoothly. I need to get a new brake booster, I can hear it hissing at me when the pedal is down.

Truck at least stops now, not as responsive as I would like it to be, but it's much better. I suppose it's because I haven't yet rebuilt the back drums yet, so I'm assuming even if I was getting 100% stopping power out of my front brakes, it probably only accounts for 70% or so of my over all braking power.

Any suggestions on how to get better braking power other than what I have planned?

hawaii_620 · **Posted:** Fri Oct 16, 2009 9:48 pm

datsunfreak wrote:

hawaii_se-r wrote:

What would be of concerns with doing something like this to my truck?

None at all Beebani's kit is well engineered and works very well. And gets you bigger brakes than stock 620 stuff, as well as service parts that are easier to find down the road. If you don't mind spending the cash, I highly recommend it. :tu:

Great parts from Beebani. Bolted up relatively easy. I'd recommend it to anyone else thinking about buying the brackets from him on ebay. :tu:

hawaii_620 · **Posted:** Mon Oct 19, 2009 12:39 pm

Does anyone know if a 280z brake booster would fit on a 620? I used a 280 master cylinder for my disc brake conversion. But was wondering if the brake booster could be switched out too.

Thanks,
Kyle

john · **Posted:** Mon Oct 19, 2009 2:45 pm

hawaii_se-r wrote:

Does anyone know if a 280z brake booster would fit on a 620? I used a 280 master cylinder for my disc brake conversion. But was wondering if the brake booster could be switched out too.

When it comes to Datsuns a booster is pretty much a booster.

But the Z booster is usually larger diameter than the B210/truck booster. As long as you have room for a booster that is 2-3" wider in diameter, it should bolt up fine.

hawaii_620 · **Posted:** Mon Oct 26, 2009 7:01 pm

Thanks Datsun Freak!

Now I just have to search out the parts.

hawaii_620 · **Posted:** Mon Nov 30, 2009 8:18 am

My fan on my 620 truck is cracked and missing a fan blade. I'm having a hard time finding a used/new one. I bought a used fan from an early model 240z, but it won't fit the 620 fan clutch. (I should have did more research before I bought it. $15 is $15.)

If I got a 240z fan clutch, would that just bolt right up to the existing water pump? It's a L20 motor.

Or could I just by a new water pump for a 240z with a fan clutch on it and replace the whole thing? are they compatible?

Thanks Datsun peeps!

1975 Datsun 620 Pickup Truck

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