Who has gone to 4.88 gears?

J

jedeka

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Has anyone gone from 3.54 to 4.88 gears on their pulling truck? What were your results after doing this? I am pulling 3rd low and want to pull 4th low.
 
Yep, sure did with 33" tires. I run 4th low and run 4500to 4800 rpm down the track
 
I did a couple of months ago, but only got one pass on them. Blew the HG, pulled the head and found startings of scored cylinder walls.

I went from 3.55 to 4.88 with 33" BFG AT/KO's (50%) and ran 4th Low the only run I got. The truck ran faster & better with the 4.88s for sure. I will post some video's for reference in just a moment.
 
Here's one of my 3.55 geared video's. I'm @ :49 seconds If you want to see the rest of my 3.55 vids go to youtube & type GotSmoke97 into the search. I have a better angle of the 4.88 run still on my camera maybe I'll get it posted tomorrow.
[ame="http://www.youtube.com/watch?v=94IcgYVzA-k"]YouTube - SKP Parts 2.6 both times.mpg[/ame]


Here is the 4.88 geared video not the best angle. I'm @ 4:47 mins
[ame="http://www.youtube.com/watch?v=0GwuP1zKwDE"]YouTube - lafayette 2.6 diesel truck pull.[/ame]
 
and im 4:00 min haha :lolly: my first pull , i think ill be going with 4.88s too
 
millerfarms said:
and im 4:00 min haha :lolly: my first pull , i think ill be going with 4.88s too
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For pulling Corbin's and The Downhill Express and the other drive back sled's around here 4.88's are plenty...if you were pulling old school drag back sleds or Lowery Bros Sleds every weekend I would say go 5.13.
 
Subscribing, as i am going to do gears as well. How are 4.88's to drive with? I'll have to drive mine to and from pulls no matter the distance lol. So would I be better with 4.10's or 4.56's?
 
HidalgoGT said:
Subscribing, as i am going to do gears as well. How are 4.88's to drive with? I'll have to drive mine to and from pulls no matter the distance lol. So would I be better with 4.10's or 4.56's?
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interested in this also
 
Depends on how fast you drive really. I think with 4:10 and a 5 speed with 33's have like a top speed of around 85 mph, depending on how hard you want to push the rev's. I am going to be going from 3:55 to 4:10's in my truck this winter.

Rick
 
Only 85 yuk lol. Had it to 120 once then thought how stupid that was and let out of it. I like running the lil ricers that always seem to want to run the lifted dodge as well as pull. Most likely go 4.10's from the 3.55's and run 35's. I dont mind pushing it hard. Well until i find the weak spots lol.
 
Spend a little time playing around with this: http://www.florida4x4.com/tech/gearcalc.php It will show you what wheel rpm you would need for different wheel speeds and tire sizes.

For 4.88s and 35 you would be turning a little over 2200 rpm going 65mph, 4.56s would be 2077 rpm. You can also estimate your top MPH
 
Might just do the 4.56's after checking that out 100mph on the high side is like 3200 so I can still play on the highway when I want.
 
4.56's might be tough to find a good pulling gear? Low 3rd will be terribly slow, low 4th will be way to much gear.
 
HidalgoGT said:
Subscribing, as i am going to do gears as well. How are 4.88's to drive with? I'll have to drive mine to and from pulls no matter the distance lol. So would I be better with 4.10's or 4.56's?
Click to expand...

Went from 4.10's to 4.88's with an auto and running 285's = 33" and daily drive and to pulls.

60 mph is around 2100 so not too bad on the road. It will never get above 95 mph (that's ok). The truck is tuned for higher rpm's and ran 35* timing this summer with a cam to match. At 3K rpm on the road it is really smooth. It would also pull well into the low 4K's too.

It was really very drivable but had it's limits. Alot depends on what you really want your truck to do.

I'll also have a set of Dana 4.10's for a 60 and 80 with a detroit locker 35 spine for the 80 and the stock carrier for the 60. Stock rear axles too if interested.
 
bubba_pa said:
Went from 4.10's to 4.88's with an auto and running 285's = 33" and daily drive and to pulls.

60 mph is around 2100 so not too bad on the road. It will never get above 95 mph (that's ok). The truck is tuned for higher rpm's and ran 35* timing this summer with a cam to match. At 3K rpm on the road it is really smooth. It would also pull well into the low 4K's too.

It was really very drivable but had it's limits. Alot depends on what you really want your truck to do.

I'll also have a set of Dana 4.10's for a 60 and 80 with a detroit locker 35 spine for the 80 and the stock carrier for the 60. Stock rear axles too if interested.
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Hmm, pm me with a price. I was thinking 4.56's but the right price maybe 4.10's would be a good way to go and have the 4th low possibilty.
 
NV4500 5 speed has roughly 0.74 OD ratio. Multiply that ratio by rear end ratio and plug that number into the Comp D RPM calculator along with tire size, 35's are roughly 34.6".

4.10 gears calculate to 85mph @ 2500 rpm, 102mph @ 3000 rpm.
4.56 gears calculate to 76mph @ 2500 rpm, 92mph @ 3000 rpm.
4.88 gears calculate to 71mph @ 2500 rpm, 86mph @ 3000 rpm.

I imagine any serious pull truck will be capable of at least 3500 rpm, just don't know anyone crazy enough to drive hours on end turning that kind of rpm sucking fuel at 8-10 miles per gallon.
 
Big Blue24 said:
NV4500 5 speed has roughly 0.74 OD ratio. Multiply that ratio by rear end ratio and plug that number into the Comp D RPM calculator along with tire size, 35's are roughly 34.6".

4.10 gears calculate to 85mph @ 2500 rpm, 102mph @ 3000 rpm.
4.56 gears calculate to 76mph @ 2500 rpm, 92mph @ 3000 rpm.
4.88 gears calculate to 71mph @ 2500 rpm, 86mph @ 3000 rpm.

I imagine any serious pull truck will be capable of at least 3500 rpm, just don't know anyone crazy enough to drive hours on end turning that kind of rpm sucking fuel at 8-10 miles per gallon.
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Ya, not looking to hold 100mph or a lil better for miles. Just saying functionality for pulling and driving as well as playing on the street. So, for me 4.10's seem to be the best choice and 4.56's the next alt. choice.
 
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