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Unread 05-24-2005, 02:30 PM   #1
CGrugger
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Is this normal

Ok, I have 33in tires, and that is about all the engine/drivetrain mods i have.

I dont even use 5th because when i got into It, my jeep loses speed even when i put it down to the floor

I have a 85 cj 7

My carb needs to be rebuilt

What do yall think

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Unread 05-24-2005, 02:55 PM   #2
killersheep
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That is absolutely normal. I have 3.31 gears in my 86 cj and as soon as i put 32" tires on, I no longer could use 5th gear. I am not going to regear tho because it cruises comfortably at 2500rpm at 70 mph in 4th and it still crawls nicely offroad.

In order to get 5th gear back you will need to regear your diff's.
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Unread 05-24-2005, 05:37 PM   #3
jeepsarecool
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What? You shouldn't lose speed unless you're not going fast enough to shift into 5th. I use 5th from about 45 mph on up. It will cruise comfortably at 60 mph. It'll keep pulling after that but I don't to get over 65 due to rpms and also it's a jeep. By the way, I also have 33" tires, 258 engine, and 3.31 gears. I do have a weber carb but it pulled fine with the old carter.
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Unread 05-24-2005, 06:02 PM   #4
killersheep
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Mine will not hold a constant speed at 70mph in 5th. ANY wind or hill and the jeep will slow. I take this as what he meant. I don't even bother to try for 5th any more because the rpms drop too low to run efficiently (i have to floor it to keep speed). If I am going 70mph and the motor is at 2500rpm, when I shift to 5th my rpms drop too low to get enuff torque/HP to get the jeep going any faster, so it is pointless to use it. I don't know what the difference is between our motors but if i shift into 5th at 45 mph you can forget getting anywhere. Especially with the wind out here in ohio. It would be "lugging" from the extremely low rpms.

I also run the weber carb altho i think it is running a little lean.

Why can't you get over 65 because of RPM's? If our setups are the same except for the 1" diff in tires I don't think you would ever want to touch 5th either. You should run at about 2200rpms at 70mph in 4th. Why even use 5th? My jeep likes to shift at about 2800 rpm. Sounds like you are shifting way early at a very low rpm???

Not looking for a flame war here....just trying to understand...
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Unread 05-24-2005, 07:58 PM   #5
wilf
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if you have the resources get you some 4.10 or 4.56 gears and then you wont have to worry about havin no power in 5th
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Unread 05-24-2005, 09:55 PM   #6
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I agree, you just plain ran out of gear.
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Unread 05-24-2005, 10:31 PM   #7
BIGM
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Remember if you put some lower gears in the rear you will get better lows for crawling and you will still have the 5th for highway driving, get some 411's I dont think you will be disappointed.
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Unread 05-24-2005, 11:04 PM   #8
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the only time i have acheived 60 mph is going down a hill

and i tried switching into gear going like 55 and then my speed droped down to 45 and then i went back to fourth
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Unread 05-25-2005, 10:44 AM   #9
just enough
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I used to be geared 3.07 and when i went from 31" tires to 33" all the power was gone. Put in 4.10's and now it climbes hills great and I have plenty of power on the road. I have a 258 with a 4 spd trans. If I had the five speed, this combo would be perfect all around. I turn 2500 rpm at 60 mph. That fifth gear would be nice on the highway.
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Unread 05-25-2005, 10:49 AM   #10
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where can i find some decent 4.10 gears
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Unread 05-25-2005, 11:02 AM   #11
jeepskate
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Register over at http://www.pirate4x4.com in their forums (but don't post any newbie questions or you'll get yer *ss chewed on) and ask for pricing in this thread http://www.pirate4x4.com/forum/showt...52#post4071352

Best pricing I've found so far for lockers, limited slips, and Yukon gears and install kits. You'll need a shop to do the install or someone who knows how to setup gears and has the tools to do it/show you the ropes. This is also the time for traction devices if they're in your plans, especially since you'll likely be looking at case changes anyway.

You can also find used stuff on Ebay and from other Jeepers.
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Unread 05-25-2005, 11:39 AM   #12
just enough
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I bought mine at a local shop. They just about matched the best deals I could find online. Had 4.10 gears, one piece axles and an Auburn pro limited slip for the dana 20 rear. Works great for the wheelin I do. Jeepskate was right and you most likely will have to get new carriers even if you don't go with a traction adding device. I had to get an open carrier for my front end.
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Unread 05-25-2005, 01:09 PM   #13
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Gears will definately help the situation. You know, I was a little worried when I put my blue CJ5 together. I was on a tight budget and was looking for a daily driver. So I swapped in my old Dana 44s out of my green Jeep (axles were locked and have 3.73 gears in them) and used the 33s that were already on the blue one. The Jeep has a pretty much stock 360 and a T176 4 speed. I was amazed that I can cruise along thru the neighborhood at 25-30 mph in 4th gear with no problem. I can pull away from a stop in second gear. I just posted this garble as maybe someone can use it as a comparison. I guess the point is.. the stronger the engine, the more it'll tolerate an anemic gear combo. The weaker the engine, the less it'll tolerate the crappy gearing. So, if you've got a tired 258 and are moving up in tire size... you're gonna have to regear or be miserable.
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Unread 05-26-2005, 06:35 PM   #14
CGrugger
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If i regear the back end, do i need to regear the front end.


I use my jeep for the beach or mud. no rock climbing. The only hills we have around here are some bridges.
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Unread 05-26-2005, 06:43 PM   #15
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Yep.. if you ever want to use 4WD again, you'll have to change out the gears in both the front and rear axles. Fail to do that, and you'll tear something up (transfer case, driveshafts..etc.)
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Lower 2

Guardrail

Down Schoolbus

Slickrock Tellico

Save

Crozet

More Crozet
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