8.25/30 combo question
03-19-2010, 11:55 AM
#1
Member
Thread Starter
Join Date: Jan 2009
Posts: 137
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999
Model: Cherokee
Engine: 4.0L
8.25/30 combo question
Ive searched alot on here naxja and many other sites Lets get that out of the wayIs it possible to run 33's with 3.55 gears if so or not what are the advantages/disadvantages of this?
03-19-2010, 11:59 AM
#2
CF Veteran
Join Date: Jan 2010
Location: Coeur d' Alene, Idaho
Posts: 1,316
Likes: 0
Received 1 Like
on
1 Post
Year: 1998
Model: Cherokee
Engine: 4.0 rebuilt w/ bored TB, banks header, upgraded ignition, 3 row rad, high flow h2o pump, 180* t-stat
yes its possible. downsides are slow acceleration, gas mileage and freeway driving...but who cares...you got 33's! 
03-19-2010, 12:18 PM
#3
I'm running 33s on the stock 3.55 gears and it does slow the acceleration. The gas mileage suffers from the engine working harder to keep those big meats turninig at highway speeds.
03-19-2010, 12:43 PM
#4
Seasoned Member
Join Date: Aug 2009
Location: Traverse City, MI
Posts: 342
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999
Model: Cherokee
Engine: 4.0 I6
i have the same combo (d30 up front and 8.25 in rear) i will be running 33s and was wondering what gear ratio to use with this to get the best mpg i could. i would like the extra torque for off road especially
03-19-2010, 12:49 PM
#6
Senior Member
Join Date: Nov 2009
Location: Rhode Island
Posts: 876
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1994
Model: Cherokee
Engine: 4.0
03-19-2010, 12:49 PM
#7
CF Veteran
Join Date: Jun 2009
Location: Denver, CO
Posts: 3,071
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1997
Model: Cherokee
Engine: 4.0
I'm running 34s and swapped my gears out to 4:10's on the auto. Power is there, but mpg is horrible. IMO, I could not bare to run on 3:55's, and believe me, it took me a while to decide to go to 4:10s.
Trending Topics
03-19-2010, 02:06 PM
#8
Seasoned Member
Join Date: Aug 2009
Location: Traverse City, MI
Posts: 342
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999
Model: Cherokee
Engine: 4.0 I6
hmm. i dont have the 33s on yet. have 31s right now. guess ill have to see how it rides with the 33s. i just noticed my gas mileage was doin downhill and figured it would get worse with 33s. guess ill have to wait and find out 
03-20-2010, 11:30 AM
#10
Seasoned Member
Join Date: Aug 2009
Location: Traverse City, MI
Posts: 342
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999
Model: Cherokee
Engine: 4.0 I6
03-20-2010, 11:56 AM
#11
Senior Member
Join Date: Jan 2010
Location: Lake Orion, MI
Posts: 686
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2008
Model: Grand Cherokee
Engine: 3.0L CRD
on 33's, most guys will run the 4.10 or the 4.56 gears.
for a long time guys with 35's couldn't go past the 4.56 gears unless they did an axle swap for a D44 or bigger axle. the 4.88 gears have come out pretty recently for the D30 and 8.25 axles. with the 4.88 though, if you run the much bigger tires, upgrade to beefy joints and allow shafts. IMO, for guys without the knowhow of modifying the axles housing on the larger axles, upgrading to alloys and bigger joints is easier for some. of course, that is all relative to the who, what were, when, and why for each person.
for a long time guys with 35's couldn't go past the 4.56 gears unless they did an axle swap for a D44 or bigger axle. the 4.88 gears have come out pretty recently for the D30 and 8.25 axles. with the 4.88 though, if you run the much bigger tires, upgrade to beefy joints and allow shafts. IMO, for guys without the knowhow of modifying the axles housing on the larger axles, upgrading to alloys and bigger joints is easier for some. of course, that is all relative to the who, what were, when, and why for each person.
Thread
Thread Starter
Forum
Replies
Last Post
ZombieResponseJeep
Stock Grand Cherokee Tech. All ZJ/WJ/WK Non-modified/stock questions go here!
8
09-22-2015 08:45 AM
codykrr
Modified XJ Cherokee Tech
9
09-18-2015 01:27 PM
mach3lude
Modified XJ Cherokee Tech
17
09-10-2015 02:34 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)