A great experience with Blue Monkey Motorsports (the company who sells the SpeedoHealer)
- Thread starter Chris
- Start date
dieselvrr
TJ Enthusiast
Grt_Ape
New Member
Glad to hear you had a good experience.
I'm reading about 5mph faster than actual speed after 33's and 4.88's. Have been looking at Blue Monkey as a solution.
I was an active member of another Rubicon specific forum (ROF) about 11 years ago. Lots of great info, but site was sold, and a lot of the guys that knew their stuff aren't there anymore. A lot of the products that used to be talked about are out of business or no longer sold. Blue Monkey seems to have great customer service, and they're still alive and kicking. That says a lot.
I'm reading about 5mph faster than actual speed after 33's and 4.88's. Have been looking at Blue Monkey as a solution.
I was an active member of another Rubicon specific forum (ROF) about 11 years ago. Lots of great info, but site was sold, and a lot of the guys that knew their stuff aren't there anymore. A lot of the products that used to be talked about are out of business or no longer sold. Blue Monkey seems to have great customer service, and they're still alive and kicking. That says a lot.
I like the fact that the Blue Monkey solution is plug-and-play, which makes for a clean install.
ROF like many of the forums (including Wrangler forum) got sold to Vertical Scope, a Canadian based company who buys up forums to monetize them. I was a member of a lot of these forums back in the day, and I too remember when they were a lot better than they are now. I guess that's part of what drove me to create this forum.
It's nice that companies like Blue Monkey, Savvy, Currie, Rokmen, GenRight (and many others) still continue to make parts for our TJs!
MikeM1554
New Member
mgroeger
TJ Enthusiast
Just curious, if your speedo was off why not just replace the speedo gear in the transfer case. I was off by 20mph and the tranny was shifting way off and I used the appropriate gear and everything is back to normal.
That doesn’t work on Rubicon NP241OR transfer cases. It only works on non-Rubicon models.
Rubicons don’t have speedo gears like the NV231 transfer case does.
MikeM1554
New Member
Or, if you have a non-Rubicon and added a super short SYE, no more gears. You need something like the SpeedoHealer.
Ordered a SpeedoHealer from eBay and got it a couple weeks later. Took ten minutes to install and program, and now my speedo is spot-on. I've tried other programming solutions but none of them seemed to correct the speed as they claimed. Super easy install - just unplug the speedo at the back of the transfer case, plug in the supplied matching plugs, route the wire up under the hood, and plug in the SpeedoHealer. Easy to program too.
Here's a before and after for plugging it in to the transfer case:
I velcro'd the unit to a hose under the hood, in case I want to move it or get at the programming buttons.
Here's a before and after for plugging it in to the transfer case:
I velcro'd the unit to a hose under the hood, in case I want to move it or get at the programming buttons.
Ok, I just had to have a motor and transmission put in my 04 Rubi. I went with a 99WJ 4.0 and an 05 42rle from another Rubi. It has 35's with what I gather is about a 3 inch lift if the measure the springs chart is correct. Since Ive had it back Ive done the gps speed check and it seems to be 5 to 8 mph slower on the speedo than gps says. It also seems to shift earlier than what seems would be normal. 1st to 2nd about 40 mph and 2250 to 2500 rpm and 2nd to 3rd at 50 ish mpr and about 3000 rpm and at 65 when OD kicks in it drops to about 1500 to 1750 rpm and is hard to maintain 65 mph, so i drive with the OD turned off.
Aside from the speedohealer fixing my speedo and odometer reading would it help adjust those shift points.
Also I do suspect my torque converter is having issues as well, which is another reason i keep it turned off.
Aside from the speedohealer fixing my speedo and odometer reading would it help adjust those shift points.
Also I do suspect my torque converter is having issues as well, which is another reason i keep it turned off.
No, it's not going to help your shift points at all.
Welcome to the 42RLE.
Re-gear it with the correct ratio (which will be 5.38) and get used to turning the OD switch off EVERY time you get in the vehicle to start it up.
Actually, a SpeedoHealer does calibrate the shift points which are controlled in part by the speed input into the ECU. The SpeedoHealer corrects the input, thus the shift points.
However, your jeep will still be a slug unless you also gear it for your 35" tires. @Chris is correct that 5.38:1 is considered an optimum ratio for the 4.0/42RLE/35" tire combination due to the 0.69:1 OD ratio of the 42RLE.
However, your jeep will still be a slug unless you also gear it for your 35" tires. @Chris is correct that 5.38:1 is considered an optimum ratio for the 4.0/42RLE/35" tire combination due to the 0.69:1 OD ratio of the 42RLE.
Funny you'd say that. When @Chris first put his in he said the exact same thing. Now read above. The 42RLE has both an input speed and output speed sensor. It could use the speedometer but why would it? It has the exact speed of the input shaft, the output shaft and the load on the engine. There really isn't anything else to consider.
Edit: it also knows the input shaft speed vs engine rpm to calculate the slip on the torque converter
I can't remember who it was I had spoke with about the shift points possibly being tied in with the speedometer, but I want to say it was David Kasper, the PCM tuning guy (one of the original engineers who helped design the PCM for the TJ). He confirmed to me that the inaccurate speedometer would have nothing to do with the shift points, and the guy at Blue Monkey who makes these Speedo Healers had reiterated that.
I thought maybe it had something to do with it, but apparently not.
That is odd. The SpeedoHealer guy told me exactly the opposite - that I would observe a change in shift points after the speedometer was calibrated.
I did in fact observe a slight change, best described for those who know the 42RLE as "less premature" rather than anything significant, but noticeable. I ran the same 8 mile route several times both before and after changing the SpeedoHealer settings and recorded speed/rpm for shift points as well as corresponding speedometer and GPS speeds each time. I remember staring at the numbers for quite a while before I concluded that it really was a slight change in the rpm's of the shift points that I had observed and not just my butt dyno or confusion caused by the change in speedometer readings at actual speed.
I don't understand automotive electronics and never will. I just drive and go through life happily ignorant of the concepts that make my brain hurt.
I did in fact observe a slight change, best described for those who know the 42RLE as "less premature" rather than anything significant, but noticeable. I ran the same 8 mile route several times both before and after changing the SpeedoHealer settings and recorded speed/rpm for shift points as well as corresponding speedometer and GPS speeds each time. I remember staring at the numbers for quite a while before I concluded that it really was a slight change in the rpm's of the shift points that I had observed and not just my butt dyno or confusion caused by the change in speedometer readings at actual speed.
I don't understand automotive electronics and never will. I just drive and go through life happily ignorant of the concepts that make my brain hurt.
Shit... you may be right and I may be wrong, or vice versa. I don’t believe I noticed a changed in shift points after the install, but I may have not been paying close enough attention.
Would be nice to have a solid answer. Like you, I don’t have an understanding of automotive electronics and don’t really have a desire too.
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