Rpm
Fleet Mechanic
Joined: Oct 2005
Posts: 1,369
Likes: 7
From: Gainesville, GA
Double clutching is just for down shifting to be smoother. It increases the RPMs to get the engine up to the same speed in both gears. It's faster doing it than explaining it. I've been cruising @ 2700 for years with no adverse consequences. I have 33" tires and 3.73 rear gears. Whatever you do to your engine, as 351 said, the RPM will not change @ a fixed speed. The maximum RPMs you can turn will change with hot rod/speed equipment, especially the camshaft and headers.
Cargo Master
Joined: Jan 2016
Posts: 2,671
Likes: 372
I think I get what you're asking. The intake and 4 barrel will let your engine breath a little easier...to get higher rpms. The trouble will happen when you exceed your valve train's ability to cycle....things will start to float and lose contact, engine will run whacky, etc and things might come loose, break and get ugly if pushed above 5000. And if you're on the original valve train, probably should keep it below 4000.
I run a lot of freeway miles at a steady 2800-3000 rpms on a new valve train.
Lead Driver
Joined: Aug 2003
Posts: 7,592
Likes: 10
From: **** hole San Jose ca.
The E-brake on my 71 4wd f250 has different cables then a 2wd axle.
An on each left & right sides cable length is different.
The 1973 & up will not fit either.
I paid $90 for one cable an the other $45 other one on ebay.
The Green Sales is where, I got mine.
These cables are in demand an rare to find any NOS.
It took me over a yr of checking ebay to find my first one, then about a yr later for the second cable that got for $45 as, I was the only bidder for it.
ND=Bill gave me the P/N for each cables
Orich
An on each left & right sides cable length is different.
The 1973 & up will not fit either.
I paid $90 for one cable an the other $45 other one on ebay.
The Green Sales is where, I got mine.
These cables are in demand an rare to find any NOS.
It took me over a yr of checking ebay to find my first one, then about a yr later for the second cable that got for $45 as, I was the only bidder for it.
ND=Bill gave me the P/N for each cables
Orich
Cargo Master
Joined: May 2015
Posts: 2,350
Likes: 7
From: Garland, Tx
I don’t know if your cables are broken or the outer banding has come unraveled. My sons 69 came unraveled and we took steel cable anchors and cinched em back into shape. It works for now.
RPMs, as it’s been said, the taller the tire the less RPMs you will run. On the plus side, it also changes the rpm curve and you can get a little more out of it if you can help it breath. Headers/exhaust for exhale, carb/intake/tall breather for inhale.
Is the tranny auto or manual?
RPMs, as it’s been said, the taller the tire the less RPMs you will run. On the plus side, it also changes the rpm curve and you can get a little more out of it if you can help it breath. Headers/exhaust for exhale, carb/intake/tall breather for inhale.
Is the tranny auto or manual?
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Mountain Pass
Joined: Sep 2017
Posts: 218
Likes: 7
From: Kalispell Montana
Hey guys , sorry for not replying all day . Worked 1/2 day and then Christmas shopping with my sister 
way rather would of worked 
I tried double clutching when downshifting and noticed a difference. I must not of noticed the first time because usually I get my rpms matched up as best I can anyway . This time I tried double clutching without touching the gas and it was way smoother than not double clutching.
Thanks Orich , I was actually going to buy the 2wd cables from Napa tomorrow. Would of been a surprise when I got things pulled apart and realized they were the wrong part
is there a way to “dry fit “ the cables without pulling my brakes apart ?
It’s manual teachnlive, I’m not real concerned about dropping my rpms or getting more out of them ( unless I should be )if I upgrade some parts like headers and exhaust and it improves that’s great , I was asking only to make sure I wasnt damaging my engine by running it to high . My cables are not broken or unraveled ...there all together missing.
way rather would of worked I tried double clutching when downshifting and noticed a difference. I must not of noticed the first time because usually I get my rpms matched up as best I can anyway . This time I tried double clutching without touching the gas and it was way smoother than not double clutching. Thanks Orich , I was actually going to buy the 2wd cables from Napa tomorrow. Would of been a surprise when I got things pulled apart and realized they were the wrong part
is there a way to “dry fit “ the cables without pulling my brakes apart ? It’s manual teachnlive, I’m not real concerned about dropping my rpms or getting more out of them ( unless I should be )if I upgrade some parts like headers and exhaust and it improves that’s great , I was asking only to make sure I wasnt damaging my engine by running it to high . My cables are not broken or unraveled ...there all together missing.
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mechelement
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