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  #13  
Old 10-19-2012, 05:44 AM
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Re: Average MPG / US or UK calibrated

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Originally Posted by chudsy View Post
I'm trying to figure out the in / out of gear clunk at the mo and want to know what's normal. We've got ne merc c350s in work so I'm not expecting that sort of refinement. I have spotted an identical V8 to mine down here so I might stalk him and see how his goes into gear!!!
Hey - had mine 2 years now and its been a blast! A 1999 unflashed and still 4 speed - like acceleration over MPG right now

As for the clunking when I first got mine I noticed it was harsh getting in to gear and was not selecting 4th

Checking the stored codes (turn the ignition on and off 3 time and look at the mileage indicator) there were two codes suggesting gear selection errors - "P0730 - Incorrect Gear Ratio" and another one that i cant remember ...

Quick search and the speed sensors that are on the NV247 box do fail. Something like £30 later (from Jeep or Mansfield 4x4 cant remember) i replaced both on the box - no need to jack, just slide under and they have a small retaining nut holding the sensor in. Solved ALL the transmission issues, gears select like butter and i gained the OD back. Silly (cheap) fixes like that make all the difference

I have an Addco sway bar, managed to get a brand new one from ebay for a steal. Get one! Handles so much better, the 9/16ths piece of string ARB that is fitted as standard is a joke

Regarding MPG i fitted a JET chip (it was super cheap again, and thought i would give it a whirl! ) and I am quite amazed at the difference. I have no idea what the MPG is configured too but on a run (sitting at 65 seems good) with cruise on it sits 31-34MPG :| previously it was around 26-28. Performance has been affected tho, much nippier. Before anyone says its just fooling the jeep to think its colder - that maybe so, but i have found no down sides yet - been in there 18months Best £40 spent so far!

Regards

Paul
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  #14  
Old 10-21-2012, 08:29 AM
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Re: Average MPG / US or UK calibrated

Cheers for the response Paul. Was yours clunky when selecting the gear or when it was driving? Mine's clunky when selecting and now that Frank mentioned it, closer listening leads me to think it's either rear diff / prop related.
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Old 10-21-2012, 09:43 AM
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Re: Average MPG / US or UK calibrated

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Originally Posted by chudsy View Post
Cheers for the response Paul. Was yours clunky when selecting the gear or when it was driving? Mine's clunky when selecting and now that Frank mentioned it, closer listening leads me to think it's either rear diff / prop related.
When popping it into drive it really did 'jolt' in and was choppy selecting gears after. Selecting reverse and drive you really did have to be at a standstill with the foot on the brake !

its easy to check without even getting anything dirty just looking at the fault codes from the dash - narrows it right down to electrical or mechanical

Need to change my diff oils and transfer box - good time to check them

Cheers

Paul
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Old 10-21-2012, 09:50 AM
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Re: Average MPG / US or UK calibrated

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Originally Posted by paul_666 View Post
Quick search and the speed sensors that are on the NV247 box do fail.
Just to not makes others confused, the NV247 is the T-case, not the tranny. The tranny is a 45RFE or 5-45RFE (both trannies are the same, only difference is the TCM flash which makes the 5-45RFE a 5 speed)
The both speed sensors are mounted on the left side of the tranny.
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Old 10-21-2012, 09:53 AM
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Re: Average MPG / US or UK calibrated

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Originally Posted by Frango100 View Post
Just to not makes others confused, the NV247 is the T-case, not the tranny. The tranny is a 45RFE or 5-45RFE (both trannies are the same, only difference is the TCM flash which makes the 5-45RFE a 5 speed)
The both speed sensors are mounted on the left side of the tranny.
Thank you for the clarification - was looking up fluids for transfer case just before i typed the response! Hehe

Paul
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Old 10-22-2012, 03:02 AM
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Re: Average MPG / US or UK calibrated

Cheers All,
Hey Paul - can you remember where you got the sensors from and did they cure the clunk / jolt when selecting a gear?
I've got a code reader and nothing comes up apart from the occasional 02 sensor which I clear but I think that's because of the LPG conversion.
I got all my fluids for the T-Case and diffs from Mansfield - you can get the transmission ATF+4 from Millers oils too - there's a chap on fleabay doing it too.
Cheers
Paul.
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Old 10-22-2012, 05:38 AM
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Re: Average MPG / US or UK calibrated

If you ever need new sensors for the tranny, then this is a good address: www.electricaladvantage.com. They sell a kit with the 2 OEM speed sensors and the pressure sensor for around USD 100. Good address for all electrical related tranny parts, good service, quick reply via e-mail.
The speed sensors when faulty, normally cause shifting problems. Don´t think though that it will help anything regarding the clunk.
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  #20  
Old 10-22-2012, 11:03 AM
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Re: Average MPG / US or UK calibrated

Cheers Frank,
I'll try getting under the back end tonight and check the rear diff fluid level as it chatters a bit on tight turns as well - I'm really hoping this will be simple like fluids or something as it's my first JGC.
I'll also check tyre pressures on the back on way home from work as one side does seem lower that the other.
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  #21  
Old 10-23-2012, 05:58 AM
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Re: Average MPG / US or UK calibrated

Hi,

For us UK jeepers, try Lighthouse Jeep or Jeepman in google.....Lighthouse stock most parts on the shelf and ship nxt day deilvery. Jeepman can find stuff for Jeeps other outlets over here cant.

Give them a go.
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