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Old 05-05-2006
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4.88's Questions

Alright, well it looks like if everything goes through, I'll be picking up brads lift from him (red fx2). I wanted to also pick up zainyD's 8.8. This will have to be re-geared. I'm thinking about 4.88's, but I just wanted everyones opinion. I will definetly sacrifice the power for gas milage. Right now I'm more concerned about the power my truck will have after it's up. I still want to have a chance at spinning the tires in the dirt

4.88's seem good ?

What would my RPMS be like with 35's and 3.88's on a 3.0 auto at say 60-70 MPH??

Would this require less downshifting when accellerating from a roll (like say getting onto the hwy or something?) because my truck downshifts a lot and doesn't move!!!

P.S...looks like i'm probably not getting a jet ski (you'll know if your a R-F addicted member )
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Old 05-06-2006
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If you're going 35s, Griggs is got like 4.56s...
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Old 05-06-2006
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get 4.56s, 4.88s were way to much for me when i had 35s .... rpms were around 3k at 65, i had the 4.0 but its going to be around the same...
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Old 05-06-2006
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what are the rpms at 60 with 35s and 4.56s??
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Old 05-06-2006
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I'm kinda torn b/c I have 3.73's and 29's now (completely stock) and I figured it out to be the same with 4.56's and 35's (same ratio) so, I was thinking of bumping it up because of rotating force (or whatever that is, the extra weight) and just for a little more pep, it seems like i'm almost going to "bog" when accelerating on the hwy...it's unbearably slow.
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Old 05-08-2006
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Hopefully Griggs will see this because he can give you the best answer. He has 35's and 4.56 and a 3.0L.

Do you do any towing ?

According to most gear tire calculators I looked at the perfect gear size(same performance as stock) with 35's was something like 4.68 or something that was not a actually ratio you could buy. So slightly down is 4.56 and slightly up is 4.88.

Based on that if you do little highway driving or lots of towing I would go with the 4.88's. If you do little to no towing, or lots of highway driving i would go with the 4.56's.
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Old 05-08-2006
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i was tossed between the idea too, but after jared said what he got and after talking to scott(big04ranger) he has 4.56s and 35s he said it is like stock. so im going with 4.56s.

i do a great mixture of city, highway, and towing. but i figure the 4.56s will be the best bet.
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Old 05-08-2006
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I agree. If you don't need that extra torque (towing or heavy wheeling) then take the 4.56s and be done with it. 4.88 would eat your gas mileage even more.
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Old 05-08-2006
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your getting the lift and bodylift? of just the lift? that bast......
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Old 05-08-2006
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Quote:
Originally Posted by got-dirty
your getting the lift and bodylift? of just the lift? that bast......
Hopefully everything...it's going to be a to take off his truck and put it on mine. He said it took you guys 23 hrs...****, I hope mine doesn't take that long!

I think I'll probably go with 4.56's, I do MOSTLY hwy driving (to and from work/school) and on the weekends I offroad it, not anything too crazy though. I plan on getting a powertrax at the least...it seems affordable, yet it does the job.
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Old 05-08-2006
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I have 4.88s but i have a 5 speed and i really like them them im glad i didnt go with 4.56s. At 80 i run like 3200 rpms but i also have a 5 speed thow.
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Old 05-08-2006
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Quote:
Originally Posted by whtedge05
I have 4.88s but i have a 5 speed and i really like them them im glad i didnt go with 4.56s. At 80 i run like 3200 rpms but i also have a 5 speed thow.
Wow, 3200 is a lot...maybe I'm wrong, but at 80 mine is about 2200...maybe 2500
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Old 05-08-2006
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the 4.0 must run completly different than the 3.0 if i was running 80 in my truck with 33s its at 2700 mybe more. so maybe my input shouldnt really matter. sorry for confusion.

you know brian had 35s, Auto and that lift kit on his truck 4.88s, he said he got 16mpg and loved it
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Old 05-08-2006
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Ya i dont really know what the 4.56s feel like but i know ever since i put the 4.88s in it feels like stock my it runs a little higher rpm but i really like them. I also saw someone say on another post that if u run 35s and have a 3.0 run 4.88s and a 4.0 should run 4.56s just becuse of the power difference
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Old 05-08-2006
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Quote:
Originally Posted by zabeard
the 4.0 must run completly different than the 3.0 if i was running 80 in my truck with 33s its at 2700 mybe more. so maybe my input shouldnt really matter. sorry for confusion.

you know brian had 35s, Auto and that lift kit on his truck 4.88s, he said he got 16mpg and loved it
hmmm...thats something to think about...maybe brian will chime in. I don't think i'd really mind tachin up on the highway...I mean...3k rpms isn't THAT bad...I'm at like 2200-2600 at 80.

I have 29's and 3.73's thats probably why though.

Your trucks final gear ratio must be different...don't forget, I do have 3.73's...so actually, you are about the same as me. It depends on the wind (as sad as that is) because in O/D I tach about 3k at 85...so 2700 at 80 seems about right. I rarely see 3k on the highway...unless i'm trying to pass someone..emphasis on the TRYING!!!
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Old 05-08-2006
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And the auto tranny mite change the rpms a little to.
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Old 05-08-2006
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lol wait till u get 35s. on the interstate i have my foot a long ways down just to keep my speed. and that is at 75mph. man i need my gears installed.
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Old 05-08-2006
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Quote:
Originally Posted by whtedge05
And the auto tranny mite change the rpms a little to.

i would think the auto tranny would be a bit higher as i would think it would slip more than a manual.
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Old 05-08-2006
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Quote:
Originally Posted by zabeard
lol wait till u get 35s. on the interstate i have my foot a long ways down just to keep my speed. and that is at 75mph. man i need my gears installed.
Haha!!

well, like everyone else said. I don't think MANY of us bought our trucks thinking they were mustangs or anything...because they aren't...they won't be for a LONG LONG TIME!! lol
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Old 05-08-2006
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dont forget, brian was running, 35s, 4.88s, on a 3l, but he also had the whipple. His truck almost ran faster than stock even with all the added lift and tires.

And on the swap, just make sure you start spraying all your stuff down for the bodylift. Take care when removing the spindles, and dont try to swap the leaf packs like we did. we could have had it done a lot sooner, but somethings were stubborn, and we made some poor attack decisions.
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Old 05-08-2006
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screw spraying the bolts down. torch is the only way to go. put a brazing tip on it and heat the bottom of the bolt up. once its hot hit it with the impact. works wonders.
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Old 05-08-2006
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we found that out while getting brads crap off. i had the whole plate glowing orange.
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Old 05-08-2006
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Quote:
Originally Posted by zabeard
screw spraying the bolts down. torch is the only way to go. put a brazing tip on it and heat the bottom of the bolt up. once its hot hit it with the impact. works wonders.
Agree ! big time !
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Old 05-08-2006
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I'm geared with 5.13's and will be running 35's. Overgeared, yes, but I plan on doing a lot of wheeling and need the extra torque.

With a 3.0 I would definitely go with 4.88's. I know my 3.slow is kind of a dog. It's up to you. If you aren't gonna do anything but have it as a DD then 4.56's would be OK.

Just my opinion.
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Old 05-08-2006
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Quote:
Originally Posted by zainyD
I'm geared with 5.13's and will be running 35's. Overgeared, yes, but I plan on doing a lot of wheeling and need the extra torque.

With a 3.0 I would definitely go with 4.88's. I know my 3.slow is kind of a dog. It's up to you. If you aren't gonna do anything but have it as a DD then 4.56's would be OK.

Just my opinion.
I think 4.88's may be a smart move...I do a LOT of highway driving, but ALOT of wheeln too. I don't mind tachin up a few 100 more to get that extra tq
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