About how much does it cost to swap a 2.5 with a 4.0?

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Re: About how much does it cost to swap a 2.5 with a 4.0? [Re: JeePete] #587767 04/03/05 05:19 PM

Anonymous

Unregistered

Wouldn't it be a lot cheaper and easier to go to 4.56 gears?

Re: About how much does it cost to swap a 2.5 with a 4.0? #587768 04/03/05 05:58 PM

Anonymous

Unregistered

Would changing the gears to 4.56 really change the cars performance enough..?

Re: About how much does it cost to swap a 2.5 with a 4.0? #587769 04/03/05 06:11 PM

Joined: Jan 2005

Posts: 26

morning view ky

slick8up

Getting the Wheeling Fever

i just bumped up to 4.56s it made <img src="/forums/images/graemlins/patriot.gif" alt="" />a big change

94 jeep 3.5 lift 4.56s gears 33/12.5s geolanders mt locked rear warn 8000 and a 4 banger 4 power

Re: About how much does it cost to swap a 2.5 with a 4.0? [Re: slick8up] #587770 04/03/05 06:21 PM

Joined: Mar 2004

Posts: 499

NY Long Island

Mudlover27 Offline

Mudrunner

Yes the gear swap would work, but he plans on using this jeep as a highway driver to get back and forth from school. The MPG would suck. (great for offraod...bad for highway) I think the best cheapest choice is to down size to stock tires size.

98 wrangler 2.5l 3 inch rustys, 2 inch body, 33X12.5 MTR's DETROIT LOCKER, 4.88 gears, moser axles, Dana 44 (rubicon housing)

Re: About how much does it cost to swap a 2.5 with a 4.0? [Re: slick8up] #587771 04/03/05 07:12 PM

Joined: Oct 2003

Posts: 7,768

Central Texas

BigJim

Web Wheeler

Quote

i just bumped up to 4.56s it made <img src="/forums/images/graemlins/patriot.gif" alt="" />a big change

With 33's and a 2.5? I would think your 60+ speed would be labored at best.. How does it hiway?
My guess is it would take 4.88 or bettr to run at hiway speeds.
Tell us what it does in traffic?
Big JIm <img src="/forums/images/graemlins/pfft.gif" alt="" />

professional bovine relocation specialist

Re: About how much does it cost to swap a 2.5 with a 4.0? [Re: BigJim] #587772 04/03/05 08:52 PM

Anonymous

Unregistered

I have no idea what gears you'd need, just throwing them out there as an idea. I know most of my friends were able to use OD again once they went to better gearing and therefore did better on gas than they were doing.

Re: About how much does it cost to swap a 2.5 with a 4.0? [Re: BigJim] #587773 04/04/05 01:54 AM

Anonymous

Unregistered

It bearly runs 50. I've never been faster then 55 even down hills. Someone told me eventhough I have 32s a 4 cyl sould go faster. HELP I new to all this stuff.
THANX

Re: About how much does it cost to swap a 2.5 with a 4.0? #587774 04/04/05 03:02 AM

Joined: Oct 2003

Posts: 7,768

Central Texas

BigJim

Web Wheeler

Taking this post into consideration I would suggest a tune up and maybe checking the cat converter. When those get partially stopped up you get something like that happening
One test is 3rd gear. Put her in 3rd and see how many revs she will get.. a stopped up cat will not let you get max revs.
Maybe you baby it too much. With those tires it should be in 4th at 50 anyway.
Bif Jim <img src="/forums/images/graemlins/pfft.gif" alt="" />
Big JIm

professional bovine relocation specialist

Re: About how much does it cost to swap a 2.5 with a 4.0? [Re: BigJim] #587775 04/04/05 03:59 AM

Anonymous

Unregistered

Most of my friends that go to 31's on a TJ w/ a 2.5 loose use of overdrive, for what its worth, and can go an absolute max of 65-70 i want to say?

Re: About how much does it cost to swap a 2.5 with a 4.0? #587776 04/05/05 06:27 PM

Joined: Mar 2004

Posts: 499

NY Long Island

Mudlover27 Offline

Mudrunner

I have a 98 2.5l running 31's and I woudl have to say the lose of OB was seen. I have 5th gear but didn't use it all that much till I did a few cheap modifications to the fuel curve. Its much better now, I am not saying that I am going to win off the line vs a stock 2.5 but its nice to use 5ht again.
cheers
Mud

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