ac92pathfinder Posted November 25, 2009 Share Posted November 25, 2009 (edited) 70mph for about the first 3 or 4 miles on the hwy. but this driving it from a cold start but the rest of the day is fine any clue? heres a pic of the trans fluid when i checked it recently. its still clean. thanks Edited November 25, 2009 by ac92pathfinder Link to comment Share on other sites More sharing options...
Terrano1992 Posted November 25, 2009 Share Posted November 25, 2009 (edited) 70mph for about the first 3 or 4 miles on the hwy. but this driving it from a cold start but the rest of the day is fine any clue? Probably it is normal behavior. Torque converter lock ("top gear" in auto tranny) will not engage until ATF temperature is lower than pre-determined. Edited November 25, 2009 by Terrano1992 Link to comment Share on other sites More sharing options...
95champagnepath Posted November 25, 2009 Share Posted November 25, 2009 Mine does around 2800rpm at 70mph warmed up. From cold it does around 3k rpm as well. I would have to say that it's normal behavior. Like Terrano said, it's probably something to do with the Torque Converter Lock. Link to comment Share on other sites More sharing options...
MY1PATH Posted November 25, 2009 Share Posted November 25, 2009 sounds normal to me. 3k rpm @ 75mph in my 5spd Link to comment Share on other sites More sharing options...
Alkorahil Posted November 25, 2009 Share Posted November 25, 2009 Agreed. 2800-3000 rpm depending on if there is a headwind or not for me at 75 mph. Link to comment Share on other sites More sharing options...
Precise1 Posted November 25, 2009 Share Posted November 25, 2009 Considering that no one is listing gear ratios or tire sizes, rpm and indicated speed is all moot. 3000@70 isn't anything excessive, these trucks run a little higher in the rpm to try to make up for lack of power anyway. I have noticed the same effect and it is the TC lockup as far as I can tell. Perfectly normal... Clean fluid should look pink and not have black residue in it. B Link to comment Share on other sites More sharing options...
ac92pathfinder Posted November 25, 2009 Author Share Posted November 25, 2009 thanks for the replies i thought so btw the black stuff when i checked the trams fluid not from the atf it was on there. thanks. so it wont hurt it doin 70 on 3k rpms? Link to comment Share on other sites More sharing options...
adamzan Posted November 25, 2009 Share Posted November 25, 2009 No, you will be fine. I try to avoid the highways here because when I have to pass someone I usually have to take out OD and have it rev at like 3700rpms! I drove down to toronto once going 130km/h the whole way, with 4.6 gears and 235 75 15 tires i was revving about 3100. Actually got better mileage than when I do 100km/h at 2500rpms. With the 31's now it revs at like 2200ish at 100km/h. I can do almost 140km/h while keeping it under three grand. Link to comment Share on other sites More sharing options...
jpawela Posted November 26, 2009 Share Posted November 26, 2009 I think my speedo or tach are off because here's what I get... Link to comment Share on other sites More sharing options...
Tungsten Posted December 8, 2009 Share Posted December 8, 2009 its not off you get that because of your 31" tires Link to comment Share on other sites More sharing options...
Precise1 Posted December 8, 2009 Share Posted December 8, 2009 Not necessarily. It may have come from the factory with 31" tires and the speedo be spot on, like my old 95XE. Not to mention, taller tires will make the speedo read slow, not fast and I doubt he is going 88mph @2800rpm. My guess is that he speedo reads high (for what ever reason) and he probably has the 4.3 gears. My old 95XE ran at 70+*2900rpm with 31" tires and 4.6 gears... B Link to comment Share on other sites More sharing options...
nismothunder Posted December 8, 2009 Share Posted December 8, 2009 ok...so I have the 4.6 gear ratio and its at 2900-3000,I would say that bigger tires affect mpg(you should get better mpg if your going steady,wosre if its stop and go) If you have 4.3s you should get better mpg going 70,since the rear end isnt spinning as much... Link to comment Share on other sites More sharing options...
nismothunder Posted December 8, 2009 Share Posted December 8, 2009 its not off you get that because of your 31" tires I think he has 4.37 gears...I dont think going to 31s will affect the rpms that much,since in fact he should be going 85-90 mph if he didnt reset the speedo when he went to bigger tires,I mean 80mph at 2700 rpm is really good,in any truck..., hell in my 150 80 is 2100,but my rear end is ether 3.55 of 3.73... Link to comment Share on other sites More sharing options...
Kingman Posted December 8, 2009 Share Posted December 8, 2009 In 5th gear I run exactly 3000 RPM at 64 MPH. Link to comment Share on other sites More sharing options...
SamTex Posted December 9, 2009 Share Posted December 9, 2009 I think my speedo or tach are off because here's what I get... That's exactly what I get as well...AT, 31's, not sure of the ratio Link to comment Share on other sites More sharing options...
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