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jgrewe
jgrewe HalfDork
6/11/22 5:42 p.m.

The 5 speed totally transforms the car. Glad you found one.

The install process of the engine/trans is a game of millimeters between the heater plenum and chassis bar in the front. I think I put a small dent in the underside of my plenum to make it work. I used the Rivergate kit and the only thing I changed was the slave cylinder to make the pedal easier.

Apexcarver
Apexcarver UltimaDork
7/14/22 8:07 p.m.

Well, I was worried I got ripped off as the seller went radio silence on me after awhile of excuses and having promised me it would ship in a day or two 3x and he'd give me a tracking number. Call me whatever, but if you are holding many hundreds of dollars from me and owe me parts I want updates.

 

I was gearing up to figure out contesting through PayPal or our credit card when this finally showed up on our doorstep this week.

Don't let the silver spray paint fool you, it will be getting a rebuild thrown at it.

 

I probably won't be tearing into the car till the driving season is over for the year, but there will be updates.

wheelsmithy (Joe-with-an-L)
wheelsmithy (Joe-with-an-L) PowerDork
7/14/22 8:21 p.m.

Killer! Loving the old school mods.

jgrewe
jgrewe HalfDork
7/14/22 9:09 p.m.

See that ridge and triangle shaped bump on the bell housing? Grind that off when you have it apart. It is that close when you are trying to install it.

Apexcarver
Apexcarver UltimaDork
7/14/22 10:23 p.m.

In reply to jgrewe :

I'll admit, I am a bit nervous. My heater plenum isn't in exactly the factory location. There wasn't one in the car when I got it, so I welded one in. There will be some trial fitting and, in a worst case scenario,cutting and reinstallation of the heater plenum.

I have heard basically mating the engine and trans in situ makes it easier, so that may be on the table to try. I honestly don't remember if the plenum is off in an advantageous or disadvantageous direction.

Apexcarver
Apexcarver UltimaDork
7/15/22 9:14 a.m.

So, time to poll for thoughts on an internal debate.

 

I want the speedometer to be accurate, so I will be getting an adaptor from Rivergate that will work with the trans. Thing is that I have two different rear end center sections for the car. 

Both are stock, just from different years, so there isnt any limited slip or things like that at play.  The one currently in the car is a 4.22, and I also have a 3.9.

 

Which one do I want to run?  I'd rather not order two adaptors (its $220) and I'm not sure I can change the adaptors out with the trans in the car anyways. 

 

 

Its pretty buzzy cruizing around and 65 is about the threshold of "I feel like I am hurting the car" for cruise speed with the current setup (ribcase+4.22).  That said, its just a 1275...  so...  65hp or so?  I mean I will be adding a header and roller rockers while its apart, but its not going to be earth shattering changes on the power level. 

 

What do you guys think?  I am back and forth. 

Gimp (Forum Supporter)
Gimp (Forum Supporter) UltraDork
7/15/22 9:19 a.m.

Five speed with the 4.22.  This isn't a highway car, and the RPM differences aren't huge.  The lower gearing will be more fun for the majority of your driving siutations with this car.

TurnerX19
TurnerX19 UltraDork
7/15/22 9:33 a.m.

I want to see the whole range of ratios in the 5 speed and 1st & 2nd in the rib case before making a decision. If 1st is low enough (lower than 2nd in the rib case) I would go 3.9. The synchro 1st in the 5 speed is the biggest advantage here. 

Apexcarver
Apexcarver UltimaDork
7/15/22 9:50 a.m.

In reply to TurnerX19 :

 

Its funny, the non-syncro 1st isnt that big of a deal to me. I guess I am just used to coming to a complete stop before engaging 1st.

 

Heres what we have

TurnerX19
TurnerX19 UltraDork
7/15/22 9:59 a.m.

In reply to Apexcarver :

Looking at that I would go 3.9 final. The reason you don't need a synchro 1st in the original box is because 2nd is so low you never need 1st except from a complete stop. With the 3.9 final there may be a few situations where you need 1st on the roll. You will love the 3.9 the rest of the time. 

jgrewe
jgrewe HalfDork
7/15/22 10:15 a.m.

I have a 3.90 in mine. The extra torque of a slightly modded 1275 makes the gearing nice. It comes off a stop light quickly and you don't have to shift before you are in the cross walk.

I have the Rivergate speedo adapter and it can be installed through the shifter hole in the tunnel with the driveline in place. Follow the instructions on cutting the shifter but be sure it ends up in the middle of the hole if you are going to use the stock metal and rubber boot. I ended up making the metal part shorter about an inch IIRC. The rubber boot kept pushing the trans out of gear. Lowering it took away its leverage.

autocomman
autocomman Reader
7/17/22 12:59 p.m.

So the heater plunum does need to be kissed with a hammer for clearance.  Anytime the trans needs to come out, engine comes with it.  No reason to try and seperate em in the car.  I have a 3.73 in my sprite from a late 1500 midget.  IMO it's the best combo for driving the car.  I can do 80 no issue in mine with the 5 speed.  Still has plenty of pep off the line.  I don't remember what engine you have though...

Fuel gauge, gotta be sure the sender matches the gauge.  There was a chage over in the early years for the ohms.  Also, if your sender has a plastic float, throw it away and out on a brass one.  You can get em from any of the speedshops online like submit or jegs.  The plastic floats don't like the new fuels and they tend to last 6 months then they leak and sink.  That's not causing your always full issue, but if your going back in the tank, it's worth the $10 to not deal with that again.

On my 5 speed swap I had to notch the tunnel slightly so I could get the drivehaft in once the trans was in.  Everyone said you slide the driveshaft in as your getting the engine trans in place, I said that's stupid. So right behind the shifter I cut the tunnel and lifednit jus a bit so I could pull the shaft out easily.  For my speedo I got a speedhut speedbox which is an electric GPS driver for a mechanical speedo.  I'll post up a tunnel pic later, not at the car right now.

Apexcarver
Apexcarver UltimaDork
7/18/22 1:13 p.m.

Autocomman, I am running a 1275.  I think its a '73 motor and pretty stock with smog stuff removed and plugged. While the car is apart for this, its going to be getting a header, RC40 muffler, and 1.5 roller rockers. 

 

I think I have decided to swap it to the 3.9's. I did some excel workup on the gear ratios and going from the ribcase/4.22 to Datsun/3.9 I will still be turning more RPM in 1st and 2nd gear for a given speed, so I am not losing out on off the line performance and the bit of added leg in 3rd+ will still be good. 

autocomman
autocomman Reader
7/18/22 8:42 p.m.

Yeah the 3.9 isnt far off from the 3.73.  it's a good balance.  I have a late smog low compression 1275 too, ran that na for years with the 3.73, it was fine.  I do like the taller gear with the turbo though.  The 5 speed makes such a good difference.  I'll take a pic of my tunnel mod in a few days.  The mentality of guys that wanted to slide the shaft in while stabbing the engine and trans....oiy.  I can't get on board.  No removing the driveshaft from the car then, unless I pull the engine and trans?  Not for me.  The mod was easy.

Only issue I've had with my trans was the quality of the new synchros.  They aren't amazing.  Gotta shift slow when it's cold or you go right past em.  Also I know my tailshaft bushing is worn so the tailshaft seal tends to leak a bit from excessive slop in the yoke.  If you find one during your trans rebuild lemme know.  From what I gather it's normally replaced with the entire tailshaft housing.  And there is no getting these parts new any more.  I'd like to just find the bushing.  When I tore my trans down I found 4th gear damaged badly, the nut had stripped inside.  It was kind of a mess and I got suuuuper lucky and found a local trans shop that had a new 4th gear lying around.  Go figure.  That was probably 6 or 7 years ago too.

8 9 10
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