Zedyone_kenobi

no worries. Both my original 71 Type A transmission and my new late 71 Type B transmission have a third gear whine. I just think that it is something about 3rd gear. It will be nice to have a 5 speed, but I am not looking forward to pulling the engine AGAIN! I have had poor luck installing a transmission with the engine in the car.

I am running a Type B 4 speed right now, so I would think the modifications would be absolutely minimal. Just wanted to be sure before I drop a decent bit of coin on a rebuilt 5 speed box.

Great Googly Moogly, I had no idea MSA sold those darn things!!! I have been waiting to refresh mine as it has a crack in the back and it has been annoying me forever!!!

Took the Z out on a few drives and I am now convinced I want to do a 5 speed swap. Keeping the rpm lower on long trips and vintage rallies (which is what I really want to do with my Z) would be a nice benefit. Just need to go find all the 5 speed swap threads to find which one I want to go with. Probably willing to pick one that will just swap in easy versus trying to pick one that is the most performance oriented. what I know so far is that the 5 speed is still a type B unit. so it should bolt in. I assume that means I can also use the standard 71 transmission mount. Shifter is still questionable. I may have to do some research on that. I think the Type B shifter I am using now should work. Still, the 5 speed is going to be nice. Anybody have a good reliable source for good 5 speeds.

I would say look into a resonator. They sell relatively cheap resonators you can put in line to cancel out the drone and help reduce overall sound. Also is your car stock? If so 2" pipe may be overkill

I have had ITG's Those round metal wire that clip to the opening of the DCOE air horn and Now I run the K&N Filter One thing to note. There is an opening on the side of the DCOE that allows air into the system to mix with the fuel idle jets and emulsion tubes. That little circle lets in air, and most of the time all of these filters DO NOT filter that air. So you could still be letting dirt into your fuel bowl. After my 1000 mile rally there was DIRT inside my fuel bowl. NOt much, but I feel that little circular opening NEEDS to be covered up.

Love the wording in this. Hints at just how hard it was to get a Z back in the day.

Every time I see a Gnose kit I get all wobbly in the knees. I have a good mind to try this!

NOrmally I do not go for this stuff, but try some plasti-dip and paint you existing headlight buckets. Then take some pics, look at it in the light, then you just peel it off. NO harm done.

NA builds are more spendy than most Cjolly. Since you are in California, I would stick to a compression ratio of 9:1, and not a drop more. 91 octane will have you fighting detonation all the time if you choose to push it. It is far more important to get the timing right, than to push for crazy compression. Ask me how I know. I have to run octane booster with every single tank I run in my Z to run the appropriate timing curve my L28 likes. I am probably running too much compression, about 10.5:1, and 93 octane does not like it. A bigger cam may help, also a larger combustion chamber, etc. It is better to build it right and safe from the onset. You do not need a forged crank. A OEM Datsun Crank is very strong and just getting it trued is enough. Also, get the whole thing balanced, but most OEM rotating assemblies came balanced from the factory, so you just need to verify it. Concentrate on getting your induction spot on and having an nice free flowing exhaust. Timing, induction, and exhaust will make you a wonderful little torque'y L28. You are not going to be making big impressive HP numbers, but you will have a very responsive and drivable engine.

I would humbly suggest doing it yourself. It is very technically easy, just takes a few hours of time. And it is something you can do yourself and enjoy the fruits of your labor each time you drive.

Just to cap off this thread. I figured out what my wicket shimmy was. The car had sat a while doing this modification, and while it was sitting we had a hard spell of cold weather. When I checked my tire pressures, I only had 18 psi in the front tires. Upon airing them up, my wicked shimmy was gone. Just goes to show you. Before tackle a problem with extensive money and labor, try common sense things first.

I did not take that many pictures, but a step by step list would go something like this. Put rear of car on jack stands as high as you can get them. Remove rear tires Disconnect half shafts from wheel hub Disconnect half shafts from differential Put half shafts on ground with hardware in plastic baggie Remove Drive shaft bolts and put in plastic baggie Remove the bolt holding the diff to the diff mount on the diff crossmember Remove the two nuts that hold the diff to the mustache bar (NOTE: on some occasions the studs that screw into the diff rear cover will come out with the nuts, in this happens, you will need to support the differential BEFORE removing the studs!) The diff is now loose and should move around a little Place jack under the differential to support its weight (IF studs were coming off with the nuts, you will already have this done) Remove 4 bolts holding the differential cross member to the chassis (NOTE: the exhaust may need be lowered to do this, so plan accordingly) With the crossmember out of the way, slowly balance the diff on the jack and lower it down from the car you will need to move it forward first to clear the mustache bar before it moves down Place the Diff on a work surface. Remove the yoke on the front of the differential. You may or may not need a puller to do this job Remove the output flanges from either side of the differential (just one bolt holds them in) Using a press or a 5 lb maul, tap or press the studs out of the flanges, you will need these to install into the wolf creek output flanges. Thoroughly clean off the studs removed from the OEM output flanges with a wire wheel. Using an arbor press or rubber mallet, press or tap the studs into the wolf creek output flanges Acquire a R180 STI rear diff. Clean diff as well as you can Inspect the side oil seals on the STI diff for tears, or dry rot. IF questionable, replace with new seals (can be bought at SUBARU Parts and Accessories | SubaruParts.com®) Install the front yoke from the DATSUN diff to the STI DIFF. The splines are the same and it will slide on, or it may need some convincing with an impact. I cannot speak as to how tight to make this yoke, but it should be very tight. There is no way to get a good running torque on the nut as the splines will make it very hard to get it on so any torque number will be masked by the running torque completely. So try to get a feel for how hard it is to turn the STI yoke and tighten until it feels the same. At this point you should have the front yoke on and now you can install the wolf creek output flanges into the STI diff. You will notice the wolf creek output flanges have a groove in the splines. THis groove is for a clip that is already inside your diff, go ahead shine a light in there and you will see it. THe flanges do not have any bolts that hold them in. The clip does it all (I know kind of creepy, but the the half shaft once installed gives the output flange nowhere to go, so it will be okay) Using a rubber mallet gently tap the wolf creek output flange into the STI diff. You will feel it go in and engage the clip Ensure the diff has plugs in the fill and drain holes. I recommend using female style plugs versus male to make draining easier. You can buy the female plugs at MSA. Fill the diff with 1 bottle (about 1 liter/1quart) of 75w-90 gear of your choice (80w-90 will work too, but check your FSM for temps and recommended weights) If the studs came out of your Datsun diff cover with the nuts, Now is the time to remove the nuts. You will probably need a vice or a strong helper to hold the stud while you get the nuts off. Clean thoroughly it will make installation easier Install the studs back onto the STI diff cover. Remove the OEM diff mount from the Datsun DIFF and Install the OEM diff mount onto the STI diff. Place the heavy as **** diff on the jack and jack it up into position. Have the diff cross member and hardware, (THAT YOU CLEANED!) ready to go. carefully and slowly jack up the diff so that the studs are lined up with the mustache bar. Once they are close wiggle the diff so the studs slide into the mustache bar holes. Once you do that, you are in good shape. Hand tighten the nuts. Now at this point you can install the diff crossmember with the 4 bolts and the diff is in. Do not forget that nut, washer and lock nut that attaches the diff mount to the diff crossmember. NOTE: IF you are installing an RT mount, you will have had to install it BEFORE you put the DIFF in. To do that you will have to remove the diff strap hardware from the sides of the transmission tunnel. You will also need to trim the bump stop (if you went that route) about 3/4". I will let the user of these directions figure out what kind of mount they want to use with the RT mount, as there are numerous different styles. Happy motoring!

Well before I wave the flag of victory I want to take her our for a much longer run. I want to see how she does on the long runs and on the track But right now I am far more worried about the wheel shimmy

Okay well I left a beautiful set of 11s on the road this morning. Got up early, took the day off and finished up on the Z! HUZZAH The puller did the trick I am happy to say. THE rest was just bolting up parts and she was off. LEt me tell you though. The sound that thing made backing up the first time was NOT a good one. IT sounded rough, like the LSD was not happy to be spinning under load or something. NO idea what it was, but I drove her gingerly around the block Just listening. My diff whine that I had for ever slowly vanished. The thing runs quiet now as far as I can tell. Backing up into the garage was silent as a mouse. So I looked for leaks and took her back out again, this time determined to break it. IF she is going to break let it be close to the house right. Pulled out on the highway and just floored it in 1st. The car jumped sideways and pulled like a damn train. leaving two lines behind me. Yeah… um that was fun. Those 3.90 gear really wake up that L28. She gets into her rev range very quickly now. I shifted into 2nd and 3rd very hard and I do think I have a clunk now. I may have not adjusted my RT mount right, or I cut too much off and it is the metal cross member on the RT mount. NOt a big deal. lowering the front of the diff is hardly an issue. So over all I am thrilled. Only now I have mysteriously developed a wicked shimmy in the front end. :ogre::ogre: I thought it could be from the tires sitting so long, but it has never been right since I took it to Nissan to have an alignment done. So a more thorough investigation is needed.

Yeah, it would seem a puller is in my near future. I may just go buy one. I have needed one many times. Lets just hope I can get one in there with the DIFF installed.

madkaw I got the pinion nut on the front of the diff off easy enough with my impact. However, the Yoke that is splined onto it is not budging an inch. Is there a secondary retention method on that thing, or is the yoke on the front of the diff that the drive shaft bolts to, really that tight!! I have had a sledge and screwdriver on it, and it did not even think about coming lose. I really do not want to pull the diff back out, but did you use a puller? OR did your front yoke just slide off.

I totally missed it… but then again, I did not go to hybrid and read a word before I tried this…I just new the R180 was an easy swap and I figured I would wing it! I just have to swap out flanges, but I think I may have to do it quirky, as I already filled the diff to the appropriate level… Oooops.

MIxed bag today. I got the drive shafts into the Diff, they literally just snap in. Almost too easy, but I a sure they are right, and then I managed to wiggle that bad boy up in there and up against the RT mount, which if I am perfectly honest took a few blows of 'convincing' to get to line up. But I squeezed it in there. I am without a doubt sure that that diff WILL not move, ever. LIke never ever. So then all went very quickly. Starting assembling things and everything is going VERY smoothly…. UNTIL nobody mentioned that the driveshaft coupler on my driveshaft does not have at the same bolt pattern as the STI Diff. I took my impact and took off the huge nut holding the yoke on to the Datsun Diff and it came off with about 10 seconds of impact beating it down. Then it hit me. What if the STI diff has a different number of splines. Tricky problem if my Datsun Yoke will not thread onto the splines of the STI diff. EDIT: Did some Net digging and apparently the input yoke (or companion flange) for the driveshaft is interchangeable between the Datsun and STI. HUZZAH, I do not have to take it back out.

That is an interesting thought Guy. But I was under the impression I would need to get different half shafts as well? I may just sell the Perrin Diff and use the stock diff cover and call it a day. Shame, loved the bling.

Well there is always this option

You are saying I do not NEED that curved bar. I would think it would provide some sort of useful stiffening. Or else why would Datsun engineers put it there. I know the diff is identical, but my new Perrin Cover sticks out further than my OEM cover did. It may hit the curved bar in question... This may require some investigation.. I If you get rid of that curved bar, then what holds the bearings? without that bar, the curved sections would be missing. I need to get back under the car again to see what is going on.

Oh Oh, I am starting to think I leaped before I looked... Looking at this image from wolf creek racing, it would appear that the bar that joins the lower support for the rear A-arms may interfere with my shwanky new diff cover.. in the words of yo semitie sam. RAzzle Frazzle fragget

That pic is spot on bud, thanks! I will check out the other RT mount threads to get an average, but your picture is what I remember!

My seals and my rear diff cover came in today. Just waiting on some hardware and we can start zipping this puppy up. ON quick question, do you have to trim the bump stop on the RT mount any? I recall some folks having to shorten it a bit. It would be good to know BEFORE I bolt it in and have the diff suspended over my head.