do you all rev or not??
Mountain Pass
Joined: Feb 2005
Posts: 203
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My motor is a purely stock 93 4.9. Got cat back and custom 2 cone intake as well as elctric fan. I rev it to redline in first (watever the computer cuts at) and probably 500 RPM less in second and third. Done it for a good 25K miles. Engine has 110K on it. All I can say, it takes it, and never even sputters atcha. I love it, will never trade it.
Twin turbo system on the way.
Twin turbo system on the way.
Postmaster
Joined: Feb 2003
Posts: 3,441
Likes: 5
From: Muskegon, MI (home)
Mine is mildly modded...bored, cammed, carbed, headers, ignition, etc. I usually shift around 2000-2500 with no load, if I have a heavier trailer behind me I'll wind er 2800-3000. I don't drive it too hard on the street, 60-65 on the freeway. With 33s, 4.10 gears, and no overdrive she is no speed demon. Off road it sees higher rpms in the mud and dune running 4000 sometimes 4500 but it does make power up there thanks to the mods. If I'm trail riding I'll chug along at 1000-1500.
Mountain Pass
Joined: Feb 2005
Posts: 203
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Yea I love trail riding, I can Idle up (or through ) most things people have a hard time getting through in there trucks... I dont like flying through stuff off road because I dont want to break anything and have to explain that I was going 40-50 or even 60 off road. 1 Time I had someone chasing me off road (dont ask why, Im sure you can figure out why) I had to punch it. I was doing probably 70 on the straights, beutiful all wheel drifts. I hated it though, i love my baby...
Elder User
Joined: Jul 2004
Posts: 620
Likes: 1
From: Toronto, ON
Originally Posted by Jefftopgun
My motor is a purely stock 93 4.9. Got cat back and custom 2 cone intake as well as elctric fan. I rev it to redline in first (watever the computer cuts at) and probably 500 RPM less in second and third. Done it for a good 25K miles. Engine has 110K on it. All I can say, it takes it, and never even sputters atcha. I love it, will never trade it.
Posting Guru
Joined: Jul 2004
Posts: 1,611
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From: Bored town OH
Srercrcr, I have the same set up, 300/4sp O/D and 3.08's 
. Well my speedo is off, and I was wondering what RPM's you turn @ 65mph in O/D.
Also I think I read something about .70:1 O/D ratio, is that correct?
When I make the big leap from 2nd to 3rd, I usually rev to 2500 in 2nd. That jump is kinda rediculous, I wonder what they were thinking. Not towing thats for sure. I'm going to switch to some 3.55's or 3.73's a.s.a.p., I think I'd still turn some low RPMs on the highway.
. Well my speedo is off, and I was wondering what RPM's you turn @ 65mph in O/D.Also I think I read something about .70:1 O/D ratio, is that correct?
When I make the big leap from 2nd to 3rd, I usually rev to 2500 in 2nd. That jump is kinda rediculous, I wonder what they were thinking. Not towing thats for sure. I'm going to switch to some 3.55's or 3.73's a.s.a.p., I think I'd still turn some low RPMs on the highway.
Postmaster
Joined: May 2004
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Schmidts.... happy to help!
I can tell you it turns 1600 at 60 mph, 1200 at 45 mph in OD. My tires are 235R15s.
Yes, the OD ratio is .70. The AOD unit is also.
Remember, 3rd is 1.0, so thats equivalent to high gear in a standard. You can use that 3rd all over town, 4th on the freeway. If you raise the rear end ratio, you're gonna lose that flexibility.
I can tell you it turns 1600 at 60 mph, 1200 at 45 mph in OD. My tires are 235R15s.
Yes, the OD ratio is .70. The AOD unit is also.
Remember, 3rd is 1.0, so thats equivalent to high gear in a standard. You can use that 3rd all over town, 4th on the freeway. If you raise the rear end ratio, you're gonna lose that flexibility.
Mountain Pass
Joined: Feb 2005
Posts: 203
Likes: 0
Originally Posted by Roushians
WHAT!!! What is the redline rpm anyways?
Ok, So I have the m5od, and hit 33MPH red line in first. With the 3.9 first gear (found that the m5od first is either a 3.9 or a 3.3), its right at 5K rpms, and somewhere around 4200 if its a 3.3. I believe its might be 5. I really wind it out, but thats been me slowly taking my truck harder and harder after I am sure that it is repsonding well to what I was doing previously.
Thread Starter
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Senior User
Joined: Jan 2005
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anybody know what rpms would be at say 45 and then 55 with 3.55 gears and said four speed over drive in say third and fourth? anybody know how many rpms each shift will drop ya? i would say first to second is pretty low, second to third is a big drop, and then third to fourth is prety mild.. anybody know???
later chris
later chris
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Fleet Owner
Joined: Sep 2005
Posts: 28,609
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From: Lake Tahoe, Nevada
As a general principle, it is more economical to run lower rpm's with a wide throttle opening than to run the same speed at higher rpm's with a smaller throttle opening.
Plus, lower rpm means less engine wear. (See Srercrcr's earlier post.)
Plus, lower rpm means less engine wear. (See Srercrcr's earlier post.)
Posting Guru
Joined: Jul 2004
Posts: 1,611
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From: Bored town OH
Originally Posted by srercrcr
Schmidts.... happy to help!
I can tell you it turns 1600 at 60 mph, 1200 at 45 mph in OD. My tires are 235R15s.
Yes, the OD ratio is .70. The AOD unit is also.
Remember, 3rd is 1.0, so thats equivalent to high gear in a standard. You can use that 3rd all over town, 4th on the freeway. If you raise the rear end ratio, you're gonna lose that flexibility.
I can tell you it turns 1600 at 60 mph, 1200 at 45 mph in OD. My tires are 235R15s.
Yes, the OD ratio is .70. The AOD unit is also.
Remember, 3rd is 1.0, so thats equivalent to high gear in a standard. You can use that 3rd all over town, 4th on the freeway. If you raise the rear end ratio, you're gonna lose that flexibility.
Postmaster
Joined: May 2004
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Schmidts....you can calculate the 55 mph. Divide 65 by 60 (my number) and multiply that by 1600 (my number).
Brosko....are you sure? I calculate it should be like 1700 with OD.
Goodwrench...too many questions (sorry).
Brosko....are you sure? I calculate it should be like 1700 with OD.
Goodwrench...too many questions (sorry).
Senior User
Joined: Feb 2006
Posts: 200
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that what the tach and speedo read. 300, 3.55 gears, 235 75 r 15 tires. im pretty sure the tach is right because it idles at 800 and it sound like 800rpms. not sure about the speedo though. what else could factor in?