Hey fellas, just looking for feedback so I can compare. Those of yous that have 4:10 gears, what kind of top speeds are yous getting? So far I've had mine at 92mph not sure at what rpm. At 60mph I'm at 2000rpms.


Sent from my iPhone using Tapatalk

 

110 ish

120ish with the 3.54's but slower getting there
same rpms'ish at 60mph as you (33's)
3.54's were about 300 rpms lower in OD

 

Ah yea I'm glad you mentioned tire size, I completely forgot about them. I'm running 285's.


Sent from my iPhone using Tapatalk

 

I have 265's and 4.10 cogs ... GPS says 92 mph ... @ 3200
with 373's i would pumch about 108
with 3.55's i should hit 114

now at 4k .. were movin ... with 3.55's i should get about 142 mph ... in a perfect world

The reason I know this is that im contemplating a 1/4 mile set up ... just for fun not all out killer .... so i been looking though different top speeds and possible trap speeds ..

http://www.grimmjeeper.com/gears.html .... Gear ratio calculator here ... even if your 2wd .. just put in genaric t-case ..... and choose your rpm,tire size, gears and OD/UD ... Enjoy

 

I think I might be there with you, just looked at my last time slip, ran a 14.75 @ 93.39 I wish I would have seen my rpms. I used to have 3:55's and had no problem hitting 100mph but I switched to 4:10's because I thought they'd be better for drag racing. I'd like to get some of my top end back on the highway.


Sent from my iPhone using Tapatalk

 

what were your times with the 3.54's? and the 4.10's kill your highway cruising. i used to cruise at 74 and 1700rpms not anymore. BUT im rarely on the interstate with this truck and it pulls a trailer so much better with the lower gears.

 

With the 3:55's I ran a 15.3 @90mph. I didn't have all the goodies I do now though. I kinda miss the cause I use to be able to cruise to ocean city on just a quarter tank of fuel.


Sent from my iPhone using Tapatalk

 

you still can just 15mph slower. LOL and this is me personally but who cares about running 140 in a 7000lbs truck? stop light to stop light smashing is way funner. if you want a drag truck get an s10 and big block it. you will break less and it will cost about 10k less to build.

 

Don't get me wrong I enjoy stop light to stop light as well but I really enjoy putting match box cars in their place on the highway


Sent from my iPhone using Tapatalk

 

How many gearing options did these things come with? For some reason I've got it in my head that mine were 3.73's when I rebuilt the rear diff, but it was years ago and I've never talked to anyone else who had them, until 4x4man chimed in above. That said, with my 285's I'm doing about 2K at 80mph, which seems to be right between you 3.55 and 4.10 guys. I've never felt the need to see what my top speed is, but it's sure feels like it's got a lot of steam left at 90.