Anyone run 33s with auto 4.2l and 3.55 gears? - JeepForum.com
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post #1 of 16 Old 04-09-2013, 06:19 PM Thread Starter
kgb_m3
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Anyone run 33s with auto 4.2l and 3.55 gears?

Hey guys, I have a 3.5" lift coming in next week and need to figure out how I'm going to have it setup.

It's an 89 auto with 3.54 gearing, dana 35 non C clip in the rear. I'm running motorcraft 2150, nuttered with ignition system upgrade. My concern is running 33s with 3.54 and the 4.2l

Currently I'm on 1.5" lift with 1/2" shackles for a total of 2" lift sitting on 31s with a very agressive offset 15x9 wheels. I don't know if running 3.5" of lift will look silly on 31s, so the plan is to go with 33s.

I also have a set of C&C fab front tube fenders with 3" flares along with rear tube fenders to go on the jeep. Having enough clearance for 33s shouldn't be a problem if I combine the 1/2 boom shackles with the 3.5" lift for a total of 4". Then slap the tube fenders on for full flex.

Jeep is used for occasional short commutes to work and mostly as a weekend toy. What do you guys think? Is this going to work or would I need a new rear end and regear the front.. TIA, I'm tight on the budget so pls keep that in consideration.

As it sits today with 2"


Full flex with 2"



89 YJ 4.2L http://www.jeepforum.com/forum/f12/kgb-89-yj-storyline-build-thread-1520814/
96 XJ 4.0L http://www.jeepforum.com/forum/f177/600-96-xj-budget-daily-overland-build-1855418/
http://www.jeepsunclassified.com
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post #2 of 16 Old 04-09-2013, 08:44 PM Thread Starter
kgb_m3
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I've searched and nothing but mixed opinions. Most information is for manual transmissions only. I have a 3 speed auto with 3.54 gears. Will that work ok with 33s?

89 YJ 4.2L http://www.jeepforum.com/forum/f12/kgb-89-yj-storyline-build-thread-1520814/
96 XJ 4.0L http://www.jeepforum.com/forum/f177/600-96-xj-budget-daily-overland-build-1855418/
http://www.jeepsunclassified.com
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post #3 of 16 Old 04-09-2013, 10:29 PM
jeepyj13
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Quote:
Originally Posted by kgb_m3
I've searched and nothing but mixed opinions. Most information is for manual transmissions only. I have a 3 speed auto with 3.54 gears. Will that work ok with 33s?
A lot better than running 3.07gears with a auto. That's what I run with 33s. God forbid a strong headwind or hilly hwy. I managed to overheat my trans bad in that type of drives. Like yesterday a strong wind was going against me on hwy which caused me to only get to 60mph even with a 4.0. When i started to sIowdown to turnoff I smelled atf so I looked at my rearview mirror so enough smoke was coming out everywhere under my yj. Luckily I wasn't far away home so I limped it back. This forced me to buy and install a aftermarket trans cooler today and will be installing a temp gauge later. I hope it will help my already struggling 3sp until I can get some $ for a rear axle swap/regearing upgrade.

"Its a Jeeps World, other 4x4s just get stuck in it."
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post #4 of 16 Old 04-09-2013, 11:39 PM
bill8bud
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Quote:
Originally Posted by kgb_m3 View Post
I've searched and nothing but mixed opinions. Most information is for manual transmissions only. I have a 3 speed auto with 3.54 gears. Will that work ok with 33s?
I have a 3 speed auto. Mine came from the factory with 3.07. I currently run 3.54 gearing with 33s. It is great on the road. But I wish it was lower for offroad. My next step will be a 4 to 1 to fix my crawl speed.
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post #5 of 16 Old 04-10-2013, 06:42 AM
xeroid81
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My 95 yj has a xj drivetrain. With 32" tires and a 4.11 I won't see 70 mph on a windy day. This is due to the aw4 which has a 4th gear final drive of .75 to 1 which has no defeat on it YET! Even with a cooler You smell the fluid puking out of the dipstick. My options to make it right would be either go back to 31's,change diff gear,or install an after market defeat for the overdrive such as the Radesign type. As it stands today I'm leaning to a defeat button for uphill or windy day driving. Kinda like when it was a 2.5 and had to downshift to 4 th to pass or go uphill!
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post #6 of 16 Old 04-10-2013, 01:48 PM Thread Starter
kgb_m3
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Quote:
Originally Posted by bill8bud View Post
I have a 3 speed auto. Mine came from the factory with 3.07. I currently run 3.54 gearing with 33s. It is great on the road. But I wish it was lower for offroad. My next step will be a 4 to 1 to fix my crawl speed.
Good to know. Do you run a trans cooler?

89 YJ 4.2L http://www.jeepforum.com/forum/f12/kgb-89-yj-storyline-build-thread-1520814/
96 XJ 4.0L http://www.jeepforum.com/forum/f177/600-96-xj-budget-daily-overland-build-1855418/
http://www.jeepsunclassified.com
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post #7 of 16 Old 04-10-2013, 01:51 PM Thread Starter
kgb_m3
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Quote:
Originally Posted by jeepyj13 View Post
A lot better than running 3.07gears with a auto. That's what I run with 33s. God forbid a strong headwind or hilly hwy. I managed to overheat my trans bad in that type of drives. Like yesterday a strong wind was going against me on hwy which caused me to only get to 60mph even with a 4.0. When i started to sIowdown to turnoff I smelled atf so I looked at my rearview mirror so enough smoke was coming out everywhere under my yj. Luckily I wasn't far away home so I limped it back. This forced me to buy and install a aftermarket trans cooler today and will be installing a temp gauge later. I hope it will help my already struggling 3sp until I can get some $ for a rear axle swap/regearing upgrade.
Mine would do that even on 31s when everything ran like crap. Since I've got a new torque converter, pressure plate, fresh filter and fluid and got rid of the carter. Still isn't great up hills but it's a lot better than it was. I'm going to order the trans cooler for sure and hope with 3.54s and 33s I'll be ok for now.

89 YJ 4.2L http://www.jeepforum.com/forum/f12/kgb-89-yj-storyline-build-thread-1520814/
96 XJ 4.0L http://www.jeepforum.com/forum/f177/600-96-xj-budget-daily-overland-build-1855418/
http://www.jeepsunclassified.com
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post #8 of 16 Old 04-10-2013, 03:04 PM
bill8bud
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Quote:
Originally Posted by kgb_m3 View Post

Good to know. Do you run a trans cooler?
No I do not. I run a Volvo electric fan now. Trans cooler is on the list. But then again I have almost 190 on it I for see getting it rebuilt in the future.
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post #9 of 16 Old 04-10-2013, 03:46 PM
dtn8tr
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I ran my '88 with 33s, 4.2L, and a 5speed with my 3.55s for a little while. I found that on the highway it was lacking once you got to highway speed...it had been ok with my 31s. I have since switched to 4.10s and it will go as fast as I need it to go...ain't gonna win a race at the strip but it doesn't lose speed in normal driving. I know it's not apples to apples comparison but it won't be far off. Fourth gear in a fivespeed is going to be the same as Drive in a slushbox.

1997 TJ, 5" IRO front with 4.5" HD IRO WJ rear, 35x12.5x15 Mickey Thompson MTZ, JKS disconnects
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post #10 of 16 Old 04-10-2013, 03:53 PM Thread Starter
kgb_m3
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Quote:
Originally Posted by bill8bud View Post
No I do not. I run a Volvo electric fan now. Trans cooler is on the list. But then again I have almost 190 on it I for see getting it rebuilt in the future.
Got ya. What cooler were you looking at? I'm picking up Hayden 404 on the way to work from Kragen. That should add some decent cooling being 7.5 x 15 x .75 in size...

Do you have a pic of the volvo fan? I may be interested in doing so for hot summer trail runs.

Quote:
Originally Posted by dtn8tr View Post
I ran my '88 with 33s, 4.2L, and a 5speed with my 3.55s for a little while. I found that on the highway it was lacking once you got to highway speed...it had been ok with my 31s. I have since switched to 4.10s and it will go as fast as I need it to go...ain't gonna win a race at the strip but it doesn't lose speed in normal driving. I know it's not apples to apples comparison but it won't be far off. Fourth gear in a fivespeed is going to be the same as Drive in a slushbox.
I see, will do 3.54 for now meanwhile I'll look for 4.10 from a 4cyl at the yard...

89 YJ 4.2L http://www.jeepforum.com/forum/f12/kgb-89-yj-storyline-build-thread-1520814/
96 XJ 4.0L http://www.jeepforum.com/forum/f177/600-96-xj-budget-daily-overland-build-1855418/
http://www.jeepsunclassified.com
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post #11 of 16 Old 04-10-2013, 08:14 PM
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Quote:
Originally Posted by kgb_m3 View Post
Mine would do that even on 31s when everything ran like crap. Since I've got a new torque converter, pressure plate, fresh filter and fluid and got rid of the carter. Still isn't great up hills but it's a lot better than it was. I'm going to order the trans cooler for sure and hope with 3.54s and 33s I'll be ok for now.
Man it sucks. I'm actually taking the same hilly trip next weekend where it all started to celebrate my brother's 21 bday. I hope my trans wont finally call the quits during the trip esp. in this warmer weather

"Its a Jeeps World, other 4x4s just get stuck in it."
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post #12 of 16 Old 04-11-2013, 01:33 AM Thread Starter
kgb_m3
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Quote:
Originally Posted by jeepyj13 View Post
Man it sucks. I'm actually taking the same hilly trip next weekend where it all started to celebrate my brother's 21 bday. I hope my trans wont finally call the quits during the trip esp. in this warmer weather
Good luck man, these jeeps can take a lot of abuse before they give out.



Im running into a strange thing here. According to the gear calculator and my actual speed/rpm readings, I have 4.10s in there. That would be awesome as I was thinking this whole time I had 3.54

Spinning 3100 at 70mph on 31s and a hair over 6800 @ 65mph..

89 YJ 4.2L http://www.jeepforum.com/forum/f12/kgb-89-yj-storyline-build-thread-1520814/
96 XJ 4.0L http://www.jeepforum.com/forum/f177/600-96-xj-budget-daily-overland-build-1855418/
http://www.jeepsunclassified.com
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post #13 of 16 Old 04-11-2013, 12:42 PM
jserna
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With a stick it is ok. Forget about 5th on hilly highways.
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post #14 of 16 Old 04-11-2013, 03:22 PM Thread Starter
kgb_m3
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Gear calculator isn't working right for me. I did the wheel rotations vs driveshaft and came up with 17.* x2/10 = ~3.55.

89 YJ 4.2L http://www.jeepforum.com/forum/f12/kgb-89-yj-storyline-build-thread-1520814/
96 XJ 4.0L http://www.jeepforum.com/forum/f177/600-96-xj-budget-daily-overland-build-1855418/
http://www.jeepsunclassified.com
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post #15 of 16 Old 04-11-2013, 08:00 PM
bill8bud
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What calc are using?
Try this one
http://www.grimmjeeper.com/gears.html
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