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Next: 84 Voyager Struts
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External
Since: Mar 06, 2005
Posts: 5
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(Msg. 1) Posted: Mon Mar 07, 2005 12:02 am
Post subject: engine rpm question
Archived from groups: alt>autos>4x4>chevy-trucks (more info?)
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Got a 1990 Chev 4x4 truck with 350, 700r4 tranny and stock size tires. My
question is what should my truck be revving at driving 60mph? I threw in a
tach and it is revving at 2600 rpm @ 60. Some say that's too high, your
tranny must be slipping. Not sure on what gears I'm running but I'm sure
they are 3.47s or something like that.
Alex |
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External
Since: Feb 08, 2005
Posts: 23
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(Msg. 2) Posted: Mon Mar 07, 2005 12:02 am
Post subject: Re: engine rpm question [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Not sure about the 350 but I do believe thats what I run at 60 with my 4.3.
But I am standard tranny and I rarely run 5th gear anymore because she
doesn't like it. How many miles do yo have on your truck?
"AY Metz" <aymetz.DeleteThis@sasktel.net> wrote in message
news:112no5b9s3669c9@corp.supernews.com...
> Got a 1990 Chev 4x4 truck with 350, 700r4 tranny and stock size tires. My
> question is what should my truck be revving at driving 60mph? I threw in a
> tach and it is revving at 2600 rpm @ 60. Some say that's too high, your
> tranny must be slipping. Not sure on what gears I'm running but I'm sure
> they are 3.47s or something like that.
>
> Alex
>
><!-- ~MESSAGE_AFTER~ --> |
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External
Since: Jan 04, 2004
Posts: 41
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(Msg. 3) Posted: Mon Mar 07, 2005 4:03 am
Post subject: Re: engine rpm question [Login to view extended thread Info.]
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"AY Metz" <aymetz DeleteThis @sasktel.net> wrote in message news:112no5b9s3669c9@corp.supernews.com...
> Got a 1990 Chev 4x4 truck with 350, 700r4 tranny and stock size tires. My
> question is what should my truck be revving at driving 60mph? I threw in a
> tach and it is revving at 2600 rpm @ 60. Some say that's too high, your
> tranny must be slipping. Not sure on what gears I'm running but I'm sure
> they are 3.47s or something like that.
------------
1,900 to 2,200 I would say is the average.
2,600 is totally ridiculous. 4.10 gears and a three speed would probably
run slower. check that tach again.
HDS<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: engine rpm question |
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External
Since: Jul 25, 2003
Posts: 14
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(Msg. 4) Posted: Mon Mar 07, 2005 12:40 pm
Post subject: Re: engine rpm question [Login to view extended thread Info.]
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External
Since: Dec 26, 2003
Posts: 225
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(Msg. 5) Posted: Mon Mar 07, 2005 2:21 pm
Post subject: Re: engine rpm question [Login to view extended thread Info.]
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To run 2,600 @ 60 mph with 3.42 gears you would need 24" tires....
<a style='text-decoration: underline;' href="http://www.drivetrainsuperstores.com/gear_ratio_chart.asp" target="_blank">http://www.drivetrainsuperstores.com/gear_ratio_chart.asp</a>
click the link, know your tire size and read the chart,
you want to be in the pink area of the graph.
--
Mad-Dog
'79 Chevy K-10
Slightly modified
pictures can be found here:
<a style='text-decoration: underline;' href="http://mad-dog16.tripod.com/" target="_blank">http://mad-dog16.tripod.com/</a>
--
"AY Metz" <aymetz.TakeThisOut@sasktel.net> wrote in message
news:112no5b9s3669c9@corp.supernews.com...
> Got a 1990 Chev 4x4 truck with 350, 700r4 tranny and stock size tires. My
> question is what should my truck be revving at driving 60mph? I threw in a
> tach and it is revving at 2600 rpm @ 60. Some say that's too high, your
> tranny must be slipping. Not sure on what gears I'm running but I'm sure
> they are 3.47s or something like that.
>
> Alex
>
><!-- ~MESSAGE_AFTER~ --> >> Stay informed about: engine rpm question |
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External
Since: Oct 12, 2004
Posts: 54
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(Msg. 6) Posted: Mon Mar 07, 2005 3:40 pm
Post subject: Re: engine rpm question [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"AY Metz" <aymetz.TakeThisOut@sasktel.net> wrote in message
news:112no5b9s3669c9@corp.supernews.com...
> Got a 1990 Chev 4x4 truck with 350, 700r4 tranny and stock size tires. My
> question is what should my truck be revving at driving 60mph? I threw in a
> tach and it is revving at 2600 rpm @ 60. Some say that's too high, your
> tranny must be slipping. Not sure on what gears I'm running but I'm sure
> they are 3.47s or something like that.
A little high in my opinion. Is your torque converter locking up??? When
driving down the road lightly press on the brake when you have you other
foot on the gas. You should feel the converter unlock and the rpm will kick
up ~500rpms. I have a 4.10 rear on truck tires (stock to the 3/4 ton
burban) and run about 2100-2200 at 60mph. I bet your converter is not
locking up. You probably have a 3.21 or 3.73 rear if you look at the
options sticker (glove box or some place similar it should tell you) or you
can take you vin into your local friendly dealer and they can tell you.
good luck,
mark<!-- ~MESSAGE_AFTER~ --> >> Stay informed about: engine rpm question |
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External
Since: Apr 14, 2004
Posts: 167
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(Msg. 7) Posted: Mon Mar 07, 2005 5:11 pm
Post subject: Re: engine rpm question [Login to view extended thread Info.]
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Joined: Mar 04, 2005
Posts: 7
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(Msg. 8) Posted: Mon Mar 07, 2005 9:44 pm
Post subject: [Login to view extended thread Info.]
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I have a 97 GMC sierra and I run about 1700-1800 RPM at 60 MPH. I have stck everythin so I would say you are running a bit hihg. could be an issue with the truck but I would say it is in the tach myself!!
nickl >> Stay informed about: engine rpm question |
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External
Since: Jan 01, 2004
Posts: 132
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(Msg. 9) Posted: Tue Mar 08, 2005 12:09 pm
Post subject: Re: engine rpm question [Login to view extended thread Info.]
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External
Since: Mar 06, 2005
Posts: 5
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(Msg. 10) Posted: Fri Mar 11, 2005 12:01 am
Post subject: Re: engine rpm question [Login to view extended thread Info.]
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When I hooked a scope to the truck and revved up the engine, the tach showed
2600 and the scope showed 2000. The tach needle also jumps around abit.
I put the tach in different vehicle and it operated perfectly.
Do I maybe have a coil problem in my truck? There is a slight miss in the
engine when it idles.
Alex
"AY Metz" <aymetz.DeleteThis@sasktel.net> wrote in message
news:112no5b9s3669c9@corp.supernews.com...
> Got a 1990 Chev 4x4 truck with 350, 700r4 tranny and stock size tires. My
> question is what should my truck be revving at driving 60mph? I threw in a
> tach and it is revving at 2600 rpm @ 60. Some say that's too high, your
> tranny must be slipping. Not sure on what gears I'm running but I'm sure
> they are 3.47s or something like that.
>
> Alex
>
><!-- ~MESSAGE_AFTER~ --> >> Stay informed about: engine rpm question |
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External
Since: Jan 01, 2004
Posts: 132
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(Msg. 11) Posted: Fri Mar 11, 2005 7:31 pm
Post subject: Re: engine rpm question [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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