let me know when you become ASE certified then you will have something to legitimately argue until then i think you need to do more research on the effects of gear swaping. <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" />

 

pony killer - Where are you getting 3800 rpm from? ranwalk simply stated(in response to IM LOWR's question) that with his 4.10's and 29.4" tire he sees 2300rpm at 70mph. Like BigTex said, It doesn't matter what motor or shift points you have as long as the trans. ratio, tire height, and rear gear are the same that rpm/mph would be the same for any vehicle. What does 3800rpm have to do with that?

I'm thinking everybody is talking about different aspects of this thread and everything is getting mixed up?

John

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by pony killer:
<strong> let me know when you become ASE certified then you will have something to legitimately argue until then i think you need to do more research on the effects of gear swaping. <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Hmmm...let's see,i'm not ase certified,but i have been in the car business(service writer at a cadillac dealership and currantly at a mercedes/porsche dealership)for over 11 years,my best friends are ase certified techs,mercedes certified and porsche certified.An expert i'm not...but i know a little and i generally try to do my research before i voice an opinion about things.
If you check out the calculator at www.dirtroad.com/gears you will see that engine size has nothing to do with rpm's turned with a given gear ratio....it's tire size,gear ratio,and transmission ratio that dictate rpm's at a certain mph. <img border="0" alt="[chug]" title="" src="graemlins/gr_chug.gif" />

 

John what i'm getting at is were giving a guy advice to change his rear axle ratio, all i'm giving is the aspects to look at before he does this because we all know that there is no weight in the back of these trucks to make a 4.10 improve your launch in the 1/4 unless he likes to see tire smoke until he grabs traction, now if he was wanting to know if it would help him in his towing aspects I could not agree more. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

ranwalk you are correct when you stated trans ratio, final gear ratio, plus mph = rpm. But if one of these factors are changed he will not see the same rpm. so if i'm in 3rd gear and he's in 4th gear at 70 mph i'm definately at ahigher rpm than he is. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by pony killer:
<strong> ranwalk you are correct when you stated trans ratio, final gear ratio, plus mph = rpm. But if one of these factors are changed he will not see the same rpm. so if i'm in 3rd gear and he's in 4th gear at 70 mph i'm definately at ahigher rpm than he is. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">No doubt there....if it wasn't for 4th/overdrive i wouldn't run the 4.10's..i have to drive interstate everyday......thank goodness for 4th/overdrive transmissions <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

 

We were all on the same page on this one but he needs to know the downsides as well as the upsides exspecialy if this guy is on a budget as most of us are. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by pony killer:
<strong> let me know when you become ASE certified then you will have something to legitimately argue until then i think you need to do more research on the effects of gear swaping. <img border="0" title="" alt="[Roll Eyes]" src="images/icons/rolleyes.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">who are you refering too there pony? granted it was 14 years ago, i was ASE and GM certified (i'll scan my certifications and diploma if anyone would like) not to mention did a gear swap in my silverado from a one legged 3.42 to a 4.10 with an eaton and have a 2800 converter with 374rwhp before the 4.8 blew.

once again, not trying to start a pissing match with you but if i get attacked i attack back. <img border="0" alt="[punch]" title="" src="graemlins/gr_punch.gif" /> that's all.

 

not at you terminator but some of these guys need to learn both the possitive and negative effects on the parts they choose. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by pony killer:
<strong> ranwalk you are correct when you stated trans ratio, final gear ratio, plus mph = rpm. But if one of these factors are changed he will not see the same rpm. so if i'm in 3rd gear and he's in 4th gear at 70 mph i'm definately at ahigher rpm than he is. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">REREAD THE POST, pony killer.

We're still talking about OD with 4.10's and rpm. NOT 3rd gear. We all know the engine will turn higher rpms at the same speed in a lower gear.

And 4.10's will give him a better launch at the track provided he has the tires for it.

<small>[ February 10, 2003, 03:41 AM: Message edited by: red53gmc ]</small>