Gear advice

[Chris1973Rr]

I have a 68 383 rr engine with a .484/284 cam what's the biggest gear I can run with that and what stall should I use

 

[1967coronet440]

Rpm range is 2200-6000 assuming that's the mopar purple cam. 2800 stall is what I ran when I had that cam and 3.91 gear, what diameter tire are you looking at running?

 

[Chris1973Rr]

Rpm range is 2200-6000 assuming that's the mopar purple cam. 2800 stall is what I ran when I had that cam and 3.91 gear, what diameter tire are you looking at running?

I have a comp cam and not sure about tire size what size would you recommended

 

[1967coronet440]

I have a comp cam and not sure about tire size what size would you recommended

What's the part number or grind number

 

[Chris1973Rr]

What's the part number or grind number

Parts number for what the cam? I apologize if I'm not understanding I'm a fairly new mechanic

 

[1967coronet440]

Parts number for what the cam? I apologize if I'm not understanding I'm a fairly new mechanic

Yes the part number for the cam

 

[1967coronet440]

I found it, what do you plan on doing with the car? Street driven mostly? Highway driving?comp recommends at least a 2800 stall and 9.5:1 compression, no gear recommendation

 

[Chris1973Rr]

I found it, what do you plan on doing with the car? Street driven mostly? Highway driving?comp recommends at least a 2800 stall and 9.5:1 compression, no gear recommendation

View attachment 415192

Mostly just driving around town and occasional track on the weekends

 

[1967coronet440]

I had 2800 stall with 3.91 gear and 26.5" tire, If I went back to that cam I would change it to a 28" tire 26.5 was to small

 

[1967coronet440]

Also I would've went to a 3200 stall

 

[Chris1973Rr]

Also I would've went to a 3200 stall

And you think that it would drive good around town and stuff

 

[mentor70]

you deff want your cruising speed to be above your stall.

so you kinda need to plan the gear ratio, tire size and stall speed to get it right. hear is a speed calculator to help.

https://shiftsst.com/speed-analyzer

 

[mentor70]

you deff want your cruising speed rpm to be above your stall.

so you kinda need to plan the gear ratio, tire size and stall speed to get it right. hear is a speed calculator to help.

https://shiftsst.com/speed-analyzer

 

[forphorty]

[

I don't agree with this. What is "cruising speed" anyway ? City driving ? Highway? Plenty of street cars have stall speeds much higher than what those old magazines recommended years ago. That old "you'll burn your tranny up if you have over 2500 stall" crap. I have two daily drivers. The 440 powered 68 Satellite has a 9.5 converter that flashes to 4500 and the 400 powered 73 RR has a MP 10.75 that flashes to about 2800. Both converters and transmissions have been in use for a dozen years. Of course a good cooler is a must.[/QUOTE]

 

[mentor70]

Ive considered this a more of a fuel consumption issue first, then a trans longivity issue second.

Its always just a guideline.

 

[HT413]

IMHO, an off the shelf converter from B&M / TCI / typical 2800 stall converter that's loose below its stall speed will hurt your fun, especially if you plan to cruise in the low 2000 rpms.

I'd call a respected converter shop and talk to them about your build and have them spec a custom converter. There are several, but my vote is for Dynamic Converter. They'll spec a converter that flashes to the right stall but when cruising below the stall speed, is more efficient than a stock converter.

For example, my converter drives nicely at any rpm, even 2000. No noticeable slippage or excess heat. But when you hit it, it flashes to 4200 rpm (my cam's power band) and the car becomes a monster.

Food for thought.