Speedy_RCW
Hooked
^^^yep. Jeep will be throwing codes for incorrect gear and go into limp mode. Need a programmer to correct it.
Getting ready to drop some money
- Thread starter bruggymonster
- Start date
^^^yep. Jeep will be throwing codes for incorrect gear and go into limp mode. Need a programmer to correct it.
I have a known Jeep owner that is running 4:88's with 37's and his speedo is accurate. Why would you
need to buy the SC programmer if the speedo is correct. The shift points won't change. You're trading
gear ratio for tire size and that configuration matches the stock ratio for the speedo.
Ddays
Hooked
I've run both 4:88's and 5:13's on my '14 and would highly recommend 5:13's. Hardly a difference mileage wise but gives you better acceleration.
Do yourself a favor & get LED headlights now. You wont believe the difference.
Listen to everyone on the programmer issue. Added bonus is you can adjust tire pressure warning light, set performance parameters, etc, etc
Do yourself a favor & get LED headlights now. You wont believe the difference.
Listen to everyone on the programmer issue. Added bonus is you can adjust tire pressure warning light, set performance parameters, etc, etc
TennJK
New member
There's no way that the gear ratio would correct the speedometer. And if you don't program your computer with new gears then it'll throw it into limp mode. Trust me, that makes driving on the interstate realllllllly dangerous
caminton
New member
I second the headlights nod. Did all kinds of things to mine before I "but the bullet" (so I thought) and ordered headlights. They're easily the best mod I've done so far. You won't believe the difference it makes. It's like going from driving at night with sunglasses on, and then taking them off. HUGE difference.
highoctane
Caught the Bug
On the '12 and up you have to reprogram for gear ratio regardless of what transmission you have, or it will go into limp mode. It likely won't even make it out of the garage before it happens. On the '07-'11 JK you don't have to reprogram, but your shift points will be off if you have an auto trans and drivability will be crap. Speedometer is unaffected by gear ratio in any JK because it gets its speedometer reading from the wheel speed sensors, not the speed of the transmission output shaft like older vehicles.
OverlanderJK
Resident Smartass
Well, not all true. On a manual it doesn't need to be set b
highoctane
Caught the Bug
For some reason I was thinking it also applied to the manual, but thinking more about, yeah your right. I know the W5A580 TCM monitors input shaft, output shaft, and wheel speeds. Manual trans has no shaft speed sensors and won't matter since you row your own gears.
bruggymonster
Member
Haha I have been saving up for a while so I can just do everything at once!
bruggymonster
Member
Okay I have a couple more questions for you guys, 1st, how hard is it to regear? will I need any special tools and can I just do it in my garage? Also what brand of drive shaft is good and do I need to get a heavy duty one or will a regular 1350 do just fine?
mastrcruse
New member
Let a professional do a regear for you. Not trying to be an asshole but if you have to ask if their are any special tools required, you haven't done your research and haven't done it before. This one is dorm thing you shouldn't test your skill out.
swampdog
New member
If you are going to 37s, get the 1350 driveshaft. Based on these questions, please don't attempt to regear yourself. Don't take that the wrong way, but it is a tricky process that requires specialty tools and a very tight degree of accuracy. No tolerance for mistakes.
bruggymonster
Member
That is what I figured, I am in the process of getting a quote for a shop to put on the lift and they said they don't regear. Anyone know of a place in Iowa that I should look at to regear or even possibly the lift also?
mastrcruse
New member
You're gonna get HUGE ranges, just be prepared. I've found that finding shops not connected to dealerships or "big names" are the best way to go. We have a few shops around here that are $1250-1400 installed for F/R gears.
We have a 4wd here and they want something like 2500-3k and there is a great shop here that is connected to a dealership. Their cost I is usually really good but their gear work is insane...$3k.
bruggymonster
Member
Ahh geez I didn't realize it would be that much.. I'll have to shop around and get a few different quotes.
Clutch
Caught the Bug
Something tells me you're in way over your head, asking about rear gussets and if you can do the re-gear yourself. My hunch is that you've been reading a lot of build threads and just put down a bunch of cool parts that you've read about but really have no idea why most of it is needed.
I think you should slow down and I bet you'd save a lot of money in the long haul. I don't want this to turn out like some Bruiser conversion.
Good luck to you!
I think you should slow down and I bet you'd save a lot of money in the long haul. I don't want this to turn out like some Bruiser conversion.
Good luck to you!
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dillard09
New member
Don't say that to loud my wife might hear you!
Mike_JK_Houston_711
New member
That's a good list if you plan on doing any serious wheeling. Nothing wrong with starting your build out the right way (which you've done here), learn the process along the way, and then wheel that sucker. Don't let anyone tell you you shouldn't do something to your rig unless it's a bad part, manufacturer, or a bad decision in general. Good luck man!