v8 cruise rpm, whats tooo much? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep CJ Forum > v8 cruise rpm, whats tooo much?

FS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitTHE NEW! VANCO DUAL MODE 15/16″ Big Brake Kit w/BlaFS: Wranger BRIGHT License Plate LED! Just $3! Great value

Reply
Unread 12-03-2009, 06:38 PM   #1
rodjr
Registered User
1980 CJ7 
 
Join Date: Sep 2008
Location: seattle
Posts: 373
v8 cruise rpm, whats tooo much?

the deal is possible sb chev swap. problem 4.10 gears, 31" tires 4spd. this puts 55mph at about 2700rpm. 55 is probably as fast as it will b used for any distance, but 2700 seems alot. whatda ya think?

rodjr is offline   Reply With Quote
Unread 12-03-2009, 07:30 PM   #2
keith460
Jeep. There's Only One
 
keith460's Avatar
1984 CJ7 
 
Join Date: Jan 2007
Location: Doylestown, PA
Posts: 4,722
2700rpm seams a little high to me especially when my 02 Ford F150 cruises @ 70mph while only doing 2000rpm and the tires are right around 32" diameter w/3.55 gears.
__________________
.
1984 CJ-7 Renegade
__________________

Restoration Thread:http://www.jeepsunlimited.com/forums...d.php?t=434226
keith460 is offline   Reply With Quote
Unread 12-03-2009, 07:56 PM   #3
trail58
Registered User
1958 CJ5 
 
Join Date: Aug 2009
Location: Louisiana
Posts: 31
As long as it's a good motor and you don't care about fuel consumption, have no fear. I run mine with 5.38 gears on 33 inch tires. Around 3000rpm at 55mph according to GPS. I've driven it to cruisin' the coast twice, 240 miles round trip. Only problem was stopping every 80 miles to fill up.I drove my 70 Ford 302 at 70mph (also 3000rpm) to North Carolina (800+ one way) with no problems.
__________________
1958 Willys CJ5 on a 71 Jeep CJ5 chassis, 231 Buick, Dana 30 front, Dana 44 rear, lockers, 5.38 on 33" tires.
trail58 is offline   Reply With Quote
Unread 12-03-2009, 08:29 PM   #4
duffer
Registered User
1955 CJ3B 
 
Join Date: Jun 2008
Location: Bozeman, MT
Posts: 643
Should be no problem. They seem to take 3200 just fine for cruising so I would not be too concerned.
duffer is offline   Reply With Quote
Unread 12-03-2009, 08:40 PM   #5
kickingprop
Registered User
1985 CJ7 
 
Join Date: Jan 2007
Location: Houston, TX
Posts: 2,042
I assume the 4spd is the SM465? You could always add something like this to get an OD...

Ranger Overdrive
__________________
1985 CJ7 Project
Phase One : 5.3L Vortec/4L60E, Moser axles for AMC20, Twin Stick'd Dana300 - Completed
Phase Two: Bedliner, Rollcage, Seats, BESRK Rear Bumper w/ tire swing, Soft Top, and a few other goodies - Mostly Complete
Phase Three: Waggy 44 front, Scout D44 Rear, 4.56's, ARB's (F/R) SOA with YJ Springs, 35x12.50x15 BFG MT - Not Even Close to beginning

Also a mostly rust-free 1970 Scout 800A That I'll get to start working on someday...

Quote:
Chrome won't get you home...BUT Rattle Can Black may just get you back"
kickingprop is offline   Reply With Quote
Unread 12-03-2009, 10:02 PM   #6
scooter
Registered User
1982 CJ7 
 
Join Date: Oct 2009
Location: ca
Posts: 217
If your using a non OD trans its gonna be a 1 to 1 ratio. Consider many 3/4 to 1 ton pickups came with 4.10 gears and pretty close to 31`s putting them where your at. Our 84 haywagon has 155K on the original everything with this setup.
scooter is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.