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Old 05-31-2020, 09:59 PM   #1
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Default Highway rpm

Hi I have a 1994 Nissan d21 4x4. Itís a v6 and 5 speed manual transmission. I was curious on what Rpms people run on these trucks. I feel like my rpms are much to high. Iím running 31-10.5-r15 wheels. Truck has 137k miles.
On the high way in 5th gear going about 70mph the Rpms hit About 4000-4500.
Itís super noisy and Iím just curios is this is how they all are or if Iím having issues with my transmission.
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Old 05-31-2020, 10:43 PM   #2
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There are a few posts on this already.
http://www.infamousnissan.com/forum/...highlight=rpms
I can't seem to find the other thread that had a bunch of posts on this.

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Old 06-01-2020, 01:01 AM   #3
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Sounds like you have the HG46 axle.

That's normal. These trucks were built when the speed limit was 55.
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Old 06-01-2020, 03:11 AM   #4
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The gearing does give 'em good "get up and go" from a stop. Most expect an old truck to be a dog off the line -- they then get a good view of the taillights.
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Old 06-01-2020, 03:22 AM   #5
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Like JP said, you likely have 4.6:1 gears. Check your door tag. There were 4.11s (rare), 4.3 (many of the manuals) and 4.6 (standard for automatics and option for manual tranny).



4.11 gears do about 70 at about 3000RPM. JP has a good graphic of that.
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Old 06-01-2020, 03:34 AM   #6
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I've only owned ONE Nissan truck that had 4WD, and I am pretty sure it was either a 1980 or 1981. I didn't own it long because of that same problem you described. At 60-65 MPH it sounded like it was wound up pretty much to the max. My friend Ronnie thought someone had installed a tranny in it that was supposed to be for a car, and not a truck, and that it fit...but didn't work well. But he was never really sure.

The upside is that this truck would go off road damn near anywhere, but on the freeway sixty MPH was about all I ever pushed that engine to go. I think the folks who suggested the type of rear end you have are right about that.

If the engine revs are too high for you in that gearing configuration, I guess you could start looking for a different one at the wrecking yards.
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Old 06-01-2020, 04:23 AM   #7
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Quote:
Originally Posted by Deerhurst View Post
Like JP said, you likely have 4.6:1 gears. Check your door tag. There were 4.11s (rare), 4.3 (many of the manuals) and 4.6 (standard for automatics and option for manual tranny).

4.11 gears do about 70 at about 3000RPM. JP has a good graphic of that.
Yes I do

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Old 06-01-2020, 05:55 AM   #8
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The TT is the standard HF-35. Pretty stock stuff, found on most hardbodies 90-97 with two wheel drive and manual trans. Good for freeway. Not so good for heavy towing or any of that. However, you can drop the rated half-ton of load into the bed and power is still pretty good for a four-banger. You WILL slow down some on steep hills, though. Current mileage on freeway is 25.5 MPG at 60 MPH. Tested that on my last trip to Oregon. Sometimes I wonder what it would get if I dumped the bug screen, the heavy Lund moonshade, and the canopy. But I won't do that.

NOTE: I am not even close to an expert on these things. I DO know you can cruise it steady at 70 and the engine doesn't seem to be wound up a whole lot. I don't have a tach.
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Old 06-01-2020, 01:39 PM   #9
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You can go to 33's and that will bring your RPMs down. Your speedo will be off though.
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