View Full Version : 4.10 and 3.55 users..
11-13-2002, 03:08 PM
ok guys with 5 speeds what is your mph at 2k i was once told by a guy with 4.10's that his mph at 2k was about 70 so i assumed mine was 4.10's as well I hit 70 at about 2200 so sounded about right i can take off in second gear all day long easily however i finally decided to take a look at the sticker under the hood (dont know why i just now did) and it says axle ratio 3.5?? we have a ford f350 psd with 5 speed and 4.10 rear and its RPMs are about the same as mine at the same speeds?? i dont know is it possible that the previous owner had the 4.10 install after market or is it just not a 4.10?? Any info would be much appreciated!
11-13-2002, 03:53 PM
My 3:54 runs about 1850 at 75mph
11-13-2002, 04:06 PM
Mine runs the same. About 1850-1900 @ 70. What are your rpm's at 55mph out of OD? I run 2100.
11-13-2002, 05:19 PM
70 mph = 2100 rpm<br>75 mph = 2250 rpm<br>80 mph = a little less than 2500 rpm<br><br><br>CR
11-13-2002, 05:39 PM
4.10s -> 2000 RPM = 62 MPH (with 305/70R16s) 19MPG
11-13-2002, 05:48 PM
To do 70 with 4.10's it takes about 24-2500 rpm's
11-13-2002, 05:54 PM
I've got 4:10"s with 285/75 R16 tires and i'm running 2400@70 MPH
11-13-2002, 05:58 PM
<br> With 3:55 gear, RPM is 2000 @ 70 MPH.
11-13-2002, 07:08 PM
Aparently my tire size, (yes, the speedo was corrected and proven with a GPS) and the 6th gear help.....80mph = 2000rpm's with 3.54's<br><br>Later, Rob
11-14-2002, 12:37 PM
It all depends on what tranny you run. The stock tire my truck came with were 265/75/16's. With 3.55's my truck goes 70@2000rpms. My buddy has on 02 with an auto and same gears and tires and he runs 1900 @ 70mph. The manual six has a little lower of an overdrive. My old powerstroke had 4.10s and the same size tire and it turned 2200 @ 70mph.
11-14-2002, 01:33 PM
I have a 99, 5 speed stock 245/75R16's, 3.54's and I run 2200 at about 70 mph<br><br>
11-14-2002, 02:35 PM
Thanks for the info guys mine is a 5 speed with 315 75R16 tires i will have to check the rpms and mph when i go home and i guess i will be able to tell then. I mean the sticker says 3.5 but it feels so low maybe not though i guess if i want or need to i could always switch to 4.10's anyone ever done this or know of priceing?? thanks
11-14-2002, 03:39 PM
<br>Aparently my tire size, (yes, the speedo was corrected and proven with a GPS) and the 6th gear help.....80mph = 2000rpm's with 3.54's<br><br>Yep, that's what I get also. Corrected speedo. 2000 = about 80 mph<br>george
11-17-2002, 03:31 PM
ok guys i done some checking on my RPM's /MPH and found that in 5th gear (manual 5speed) at 60 MPH i am exactly at 1800RPM's however i do have bigger tires so if i use one of those speedometer calculators where you put in stock tire size speedo reading and new tire size it tells me that when mine says 60 i am doing 65.59mph so i guess at 1800 rpms i am really doing 65MPH what are anybody's thoughts on this?? i know for sure at 2000rpms i am not doing 80!! i am confused not that it matters one way or another to me i mean the truck runs strong i would just like to know for sure!
11-17-2002, 10:07 PM
<br>i am confused not that it matters one way or another to me i mean the truck runs strong i would just like to know for sure!<br><br><br><br>CTD nuff said <br><br> ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D ;D<br><br> : Eddie : 8)
11-17-2002, 11:29 PM
If you want to correct your speedo, replace the speedo drive gear with one that has 2 teeth fewer. I believe the part number is 520676xx where the xx are the number of teeth. I forget the number of teeth stock with 3.54 gears (31 rings a bell). It is easy to pull out and check (top rear of transfer case).<br>Marc<br>
11-18-2002, 12:34 PM
I've got a '97 with an automatic, 4.10 gears, and 235-85-16 tires and I run just under 2500 rpm at 75 mph.
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