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-   -   cruising speed (http://www.jeepforum.com/forum/f12/cruising-speed-1468050/)

Lrasser 01-23-2013 04:52 PM

cruising speed
 
i have a simply question. I've searched the threads and couldnt find anything. I have a 87 YJ 4.2 auto with 308 gears and 33's. What are you guys with simliar setups able to cruise at during highway speeds? I was thinking of regearing to 410's but im afraid with the 3 speed auto i might loose top end. As it is i feel like im pushing it getting to 65mph. Any input is appreciated.

Mark05059 01-23-2013 05:00 PM

try this.. You can play around with tire size and gear ratios etc...

http://www.grimmjeeper.com/gears.html


note: your trans will probably be listed under dodge.

Lrasser 01-23-2013 05:09 PM

thanks. tried it but didnt really help me much. couldn't make sense of the results

SeanB95YJ 01-23-2013 05:37 PM

Quote:

Originally Posted by Lrasser (Post 14841399)
i have a simply question. I've searched the threads and couldnt find anything. I have a 87 YJ 4.2 auto with 308 gears and 33's. What are you guys with simliar setups able to cruise at during highway speeds? I was thinking of regearing to 410's but im afraid with the 3 speed auto i might loose top end. As it is i feel like im pushing it getting to 65mph. Any input is appreciated.

When you went to 33s, did you change your speedometer gear to accommodate the change?

What you THINK is 65 might actually be more like 75-80 ;)

Lrasser 01-23-2013 05:41 PM

I didnt change my speedo gear but im using my gps for speed. speedo is off by about 6-7mph by the time you hit 50mph.

Mark05059 01-23-2013 06:11 PM

Quote:

Originally Posted by Lrasser (Post 14841558)
I didnt change my speedo gear but im using my gps for speed. speedo is off by about 6-7mph by the time you hit 50mph.

to use that chart you put in what you have for a trans (dodge tf 999) 231 transfer case and your rear axle ratio.. push calculate and scroll down till you see road speed.

Lrasser 01-23-2013 06:54 PM

and it tells me I will be going 203840rpm's at 65mph

Mark05059 01-23-2013 07:25 PM

Quote:

Originally Posted by Lrasser (Post 14841889)
and it tells me I will be going 203840rpm's at 65mph

I get 72 at 3k

Lrasser 01-23-2013 07:28 PM

with an automatic? what size tires? thanks!

mrmark 01-23-2013 07:31 PM

that link works perfect for me

Mark05059 01-23-2013 07:32 PM

Quote:

Originally Posted by Lrasser (Post 14842094)
with an automatic? what size tires? thanks!

I used a TF999 and 33 inch tires (used your profile info) and a 4.11 rear ratio. I can change any info you wish or you can try it again :2thumbsup:

Lrasser 01-23-2013 07:48 PM

i got it to work. not sure how acurate this is though. I'll compare it to my speed and rpms's tom. thanks

mrmark 01-24-2013 05:48 AM

Quote:

Originally Posted by Lrasser (Post 14842190)
i got it to work. not sure how acurate this is though. I'll compare it to my speed and rpms's tom. thanks

It is accurate if you have the proper info on your stuff


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