Hey Guys,couldn't find much about this.I was wondering what kind of road speed you guys are getting in fifth gear on the highway?I think I have the 3.55 rear end with 295/75/16 tires and at 1800-2000 rpm I was only doing about 100km/hr I think it's around 60-65 mph or so,does this seem right to you,I was expecting more speed for those revs? thanks...............Burke

 

Well I have 4.10 gears with the 5 speed, with 245 75r16 tires and am turning 2500 RPM @70mph.

Dose any one know the finial gear ratio of the NV4500 in O/D?

Bob

 

I run about 2000 or so at 70 mph with my 3:55's and have 265/75/16's, yours sounds like 3:55's to me, look under the hood, there should be a sticker on the underside of the hood itself that will tell you.

 

I know my truck has a 5 speed with 3.54 rear and I can only do 98 mph before I read line

 

I'm at just about the same, maybe 2100 rpm for the 70mph speed. Same 265/75/16's tires. Although my speedo is off by about 4mph (probably a good safety net). Strangley, the 4-speed automatic '95 4wd I owned over six years ago would run about 1850 - 1900 at 70 mph. Was a bit odd - anyone know why?

 

53 flapper I would guess that if it's not cracked by this point, your "53" block will probably be fine. You have really nice low mileage, but it's likely thermo-cycled enough times by now to have cracked if it was going to crack. Hope this is right!

 

nv4500 overdrive ratio is=.75
automatic=.69
nv5600=.73

 

I have 4.10s and 285/75/16s and I run about 2500 to do 75mph, about 2000 or so at 60-65. I used to govern at about 83 mph or so and with the new gsk I racwd a 24v last night on the highway and backed out of it at around 90 mph, I think I was around 3000 or so, but my speedo is off a bit, too.

 

Have you had your speedo re-calibrated for the bigger tires? I run 110km/h at 2k rpm, with 235/85/16s, which are 31" tall.

 

NMCTD,

Thanks for the finial gear ratios, that really helped out.

Bob

 

anytime!!!!

Heres a couple really cool gear calculator spreadsheets for you guys to run the numbers with, makes it nice if your thinking about changing gears or tire sizes.

http://cumminsdatabase.com/read.php?id=145
http://cumminsdatabase.com/read.php?id=155

 

2100 rpm I run 75 mph. got 3.55's and 33" tires.