If you can scoop the complete SR20 drivetrain from your donor vehicle then do it!!! This will ensure you have all the required bits. Of course this is rarely the case with most SR20 engine swaps. Most times you only have the engine.

Things you'll need:
The SR20 donor engine, a compatable transmission either automatic or manual, compatable driveshaft or check to make sure your stock D/S will fit in the transmission, complete computer system and complete wiring harness.

Things to determine in the planning stage:

Are you dropping in a turbo?
Or going the plain EFI route?
Do you want a 5 speed manual and do you know which clutch you want?
Automatic tranny?
Will your original driveshaft fit in the new transmission's tailshaft?
What condition is your frame in?
What condition is your suspension in?
What size exhaust pipes do you want? 2.75", 3", 3.5"?
Is your stock radiator in good condition? You may need to provide better cooling capability for the needs of the SR20.

The boltup part is straightfoward if your D21 came with a 4 cylinder. The D21's engine and tranny mounts should all line up or be very close so that a minimal amount of fabrication work is needed.

I welcome others to post pertinent info because this topic is a hot one.

Attachment: HBcTurboSR20.jpg (23435 bytes, downloaded 11334 times)

The 2000 and later H233B's were equipped with 4.363, 4.636 and 4.880 gear sets.

If you want smaller gears (which lowers your highway RPM's), you'll have to look at rear diffs from RWD cars.

The front differential is not a suitable candidate for such a use because the axle tubes are different lengths. The reason for that is how the front drive shaft attaches from the transfer case to the front differential. It's an offset alignment.

240's from the 70's were all set up with IRS. (indendent rear suspension).

But if you stick with the solid axle the truck comes with you can install a Pan Hard Bar which is better suited to control side sway of a body. Furthermore if you stick with a 233B you can install, unless it already has it, a factory limited slip differential. That will allow the rear wheels to hook up every time in straight line travel. It will also let you drift your truck which can be done if you're crazy enough!

I do it in my Xterra on the icy trails all the time. What a blast!

I don't see why he wouldn't help you in your quest. Just put 'Attention to Steve' in your subject line.

Most of the wiring stuff is the same. IE Alternator, AC system, oil pressure sending units and I am quite certain the fuel pump wiring is the same as well. The trouble comes from the Air/Fuel sensors and how they talk to the computer. Which of course is your dilema.

It's quite possible the SR20's computer will connect into the D21's wiring harness....but there is also a possibility that the wrong wire could have
power and cause a short somewhere.

Try and get the wiring diagrams for your SR20's donor vehicle and your D21. Then start doing some wire color code comparisons and trace them back to their source switch/relay/etc on the diagram.

I feel for you I really do... but at least it's a start.

http://nissancustoms.com/viewtopic.php?t=6311

Bear in mind that my truck is a 93 king cab MT. You should be able to find your specific FSM on phatg20.net.

This is what it looks like when it's finished:

1. Do I need to move the power steering?
2. Do I need Different Gauges?
3. The clutter in the bay from the ka24, can that be removed or is it required for

Modified by Stank at 1:22 PM 9/2/2007

I did a writeup on the wiring from my truck (maybe it should be stickied?) and I'll do a start to finish writeup when I get time.

BTW the driveshaft does need to be cut and if you use the stock motor mounts the engine will sit wrong.

Quote, originally posted by Stank »

Ok, I have a 90 D21. Not ant different than steve's. I got the sr20det with ecu, harness, trans, and sensors. I understand mounting it into the bay, the engine mounts appear the same. The drive shaft hooks right up. My questions are, for starters. 1. Do I need to move the power steering? 2. Do I need Different Gauges? 3. The clutter in the bay from the ka24, can that be removed or is it required for The chassis on the 87 hardbody should be the same (wiring will be different) and I don't see why you can't run an SR in a 4wd truck. Modified by Stank at 1:22 PM 9/2/2007

That would be cool. This is about the only thread I could find on here and there isn't as much in depth info as there could be. If there is a thread up, could someone link me to it please? Also, what do people do about suspension and steering on the D21s? Is it a lot of work to fit coilovers to them, as I'm considering one for a drift project.

Cheers