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Yes it's helpful, we get 95 degrees in summer here aswell, than -40 in winter, and no thats not a typo lol. I guess even if it doesn't ping when its cooler, it might when its that hot outside. I think I will still measure cylinder pressure though. Though it looks like the car is already set at...

Really good posts guys, thanks. I will start with measuring the PSI. So you are saying at my elevation i will run 10 PSI lower than at sea level?

I guess I’m concerned that I will drive and damage the engine without noticing it. Though it sounds like you can definitely feel pinging, its pretty hard to ignore.

Cool, I will purchase a pressure gauge, I should have one handy anyways.

The previous owner was far more knowledgeable and experienced than me, he said he ran 91 octane though he did not drive/own the car much before he sold it. He said it should scream on 94, but realistically I understand that if the car doesn't need it, it won't run any different and it's just a...

Hmm, do you feel it at all? Or is it a simple question of you cannot miss it? Sorry I was wrong about the carb, its actually a 650 CFM AVS2

Im wondering if I can run 91 octane, so far I've just been running 94 but it's expensive and harder to find in my area. The engine is mostly stock from what I understand, so 10.5: 1 pistons pre 1971 with X heads. Though im not sure of the cam but I believe it's a COMP XE284 high lift but might...

Update guys, I used my timing light and the tach is out. The RPMS, im getting are right in line with what would be expected for 3.73 gears. I did pop my head up there but can't really see anything, even if I used a scope camera there is no way I can reach it if there was a switch back there...

Good Good idea, I actually have one.

I knew I have limited slip before, the two black lines behind me told me :rofl:. I was actually told its a Detroit locker since the rear end was rebuilt. I actually had a Detroit locker on my old 80 Volare Roadrunner aswell, when it was new the tires would chirp when turning. It managed to break...

Haha sorry you're right, I own all mopars but really im brand agnostic.

Great idea, I will give it a shot. At the end of the day a working tach is not important. Though it's nice when you have one to make sure it works. I also have a digital timing light that reads RPMS, so I can also compare the tach to that. My 80 roadrunner did not have a tach, either does my...

OK so tried this, i did two wheel turns and came up with around 7.5. So that should basically be 3.73, so i guess the tach is out.

The rear end was rebuilt and changed, it has a true POSI now To what I’m told is 3.73.

I believe it’s an OEM reconditioned part as it was $1400, apparently i would have to drop the steering column to pull the cluster without scratching it accordingly to the previous owner.

Yeah likely not 4000, though i drive a diesel on daily basis so i have nothing to compare to.

Yup thats about right based on the calculators I've used.

yes! so its the tach? The RPM calculator said I should be around 3200 RPM. Should I pull the cluster and check the back?

One would think but it definitely does not run like it has 4.30 gears. I had 3.91's in my velar roadrunner with a 360 and 727 transmission so I have an idea of how gears like this should feel.

Im assuming I should pull off the cluster to get to it? There sounds like it could be the case, the previous owner bought a new cluster and installed it so it's very likely he didn't know which switch to select.

Definitely not slipping, it shifts pretty hard due to the stage 2 shift kit.

Sorry, they are very close to stock size, 25". So 235/60/R14 in the back.

Hey Guys, pickuped up a 70 Dart swinger 340. It's supposed to be 3.73 gears which feels about right ( I had a 3.91, 360, TF 727 Auto before). For some reason the tach is reading 4000 RPMs at 62MPH, I verified the speedometer is correct with a GPS app. Should I not be revving around 3200 rpms? Is...