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  #16  
Old November 16th, 2017, 10:50
Snipes243 Snipes243 is offline
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Re: 97 TJ w2.5L Throw me some ideas

Dumb question but have you checked the speed compared to an god unit?

I thought my 97 2.5l with 33 wouldn't go above 65. But the speedo was off cause we used 2 different gps units, and it was actually going 75mph.
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  #17  
Old November 16th, 2017, 15:23
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Re: 97 TJ w2.5L Throw me some ideas

Agreed, my 1996 2.5L, manual trans XJ came with 4.11 gearing. With "oversize" 235 / 75 R15 Firestone Destination A/T tires my GPS and speedometer both read the same at 65.
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I thought my 97 2.5l with 33 wouldn't go above 65. But the speedo was off cause we used 2 different gps units, and it was actually going 75mph.
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  #18  
Old November 17th, 2017, 11:33
WB9YZU WB9YZU is offline
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Re: 97 TJ w2.5L Throw me some ideas

I had a YJ with a stock drive train (D30/35, 4.10, 2.5L) and 33X12.5s, it went 65 on the flats, but I would need to down shift to 3th to make hills. I was almost never able to drive in 5th. A re-gear would have certainly helped.

The nice thing about a 2.5L with a manual and stock drive train is you will never blowup a decent u-joint, even if you try real hard. It will run out of torque before you can do any damage
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  #19  
Old November 17th, 2017, 11:41
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Re: 97 TJ w2.5L Throw me some ideas

Quote:
Originally Posted by WB9YZU View Post
I had a YJ with a stock drive train (D30/35, 4.10, 2.5L) and 33X12.5s, it went 65 on the flats, but I would need to down shift to 3th to make hills. I was almost never able to drive in 5th. A re-gear would have certainly helped.

The nice thing about a 2.5L with a manual and stock drive train is you will never blowup a decent u-joint, even if you try real hard. It will run out of torque before you can do any damage
I cannot tell you the number of joints I broke with my 84 xj with a 94 yj drivetrain on 33's. I also broke the D35 with it and then spun the d35 housing. Of course I was and always have been hard on the xj's in the rocks......
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  #20  
Old November 17th, 2017, 12:31
WB9YZU WB9YZU is offline
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Re: 97 TJ w2.5L Throw me some ideas

WOW! I guess!

Goes to show you YMMV

Both the XJ and YJ had 260 joints.

Personally I think 270 joints with the larger factory shafts were an issue. The ears on those shafts are weak. You never actually break the joint until you chuck a cap, then all he!! breaks loose.
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  #21  
Old November 17th, 2017, 14:08
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97 TJ w2.5L Throw me some ideas

Hey sam I saw a TJ D30 with 4.56 gears for sale on OfferUp. Might be a step in the right direction. Was around $150 I think with no knuckles

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  #22  
Old November 21st, 2017, 06:16
043500 043500 is offline
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Re: 97 TJ w2.5L Throw me some ideas

I've had 2 TJ's with the 4 bngr and 33's. I regeared both to 4.88's. It still struggled but would do 70-75 on the highway in 5th gear. Around town and off road it made a BIG difference. Sweet spot on that motor doesn't even really hit until 3K RPM's and they'll run at 4K all day and not sweat.

Also remember...it's a square block on wheels.
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  #23  
Old November 24th, 2017, 20:53
SPECFab SPECFab is offline
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Re: 97 TJ w2.5L Throw me some ideas

My 95 on 4.10 gears and 5 speed with 35's still cruised at 70.
It was slow getting there but it did it.
And I only used 5th down hill.
Yours sounds like the motor is lacking power. More than the usual 2.5 lack of power.
Do a compression test, check for a partially plugged cat, or a flat cam lobe.
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  #24  
Old November 26th, 2017, 16:32
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Re: 97 TJ w2.5L Throw me some ideas

Rather than make a decision based on opinions, why not actually troubleshoot it instead of throwing money at it. First off, do a compression test both dry and wet. Post up pix of the spark plugs. Do a vacuum test, both at ideal and at 3500 rpms in neutral.

Grab a timing light and measure the timing at idle and 3000 rpms.

Get a loaner pressure gauge at Autozone and measure the fuel pressure both at idle and at speed under load.

Take a pix of the tail pipe for soot etc.

Post up your results and I/we can help tell you what is going on with the engine. All the gauges you need are available on the loaner program at Autozone. If you need help in performing the tests, post up and I/we will instruct you step by step.
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Last edited by old_man; November 26th, 2017 at 16:37.
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  #25  
Old January 17th, 2018, 11:10
peterjford peterjford is offline
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Re: 97 TJ w2.5L Throw me some ideas

My dad had a 95 YJ with the 2.5. He put on custom d44s with 5.68 gears and a very heavy flywheel. It had to towed to trails after that, but it could climb anything.
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  #26  
Old January 17th, 2018, 21:54
smccollamjr smccollamjr is offline
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97 TJ w2.5L Throw me some ideas

Does that tiny air filter have enough surface area to suck in enough air?


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  #27  
Old March 18th, 2018, 06:34
cabz cabz is offline
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Re: 97 TJ w2.5L Throw me some ideas

I run a YJ with a 2.5 and anyone here who has seen me at the crawl can tell you the 2.5 will take a beating and love every minute of it. I work mine over pretty good. I put a d44 from an XJ in the back and regeared it and the front disconect d30 to 4.88's and put lockrites in them and never looked back.
i have a header and tb spacer on the engine, electric fan and I found a stage two cam for it moons ago. on the exhaust i left the cat and put on a dynaflow muffler .
Dont remove the cat takes away from the low end torque the 2.5 likes ai little back pressure to run right .
keep in mind when you talk 5th gear and highway speeds two things , the better off road the worse on road .and the rwangler body style is as aerodynamic as a brick and in reality was never designed to go over 60 by its original design see 1942
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