4.88 gears with 35's too much Gear? (1 Viewer)

[eldgenb]

Hey guys, I am in my lift and planning stage, I have the j springs with front spacers to get rid of the rake and I am going to run 35's, I notice that while pulling my motorcycle around with my untility trailor that the while on the freeway with the cruise on that it keeps kicking down to third all of the time. I was going to run 4.56 gears that would bring me pretty close to stock but go to thinking that 4.88 would have a better rpm in OD then stock in 3rd gear. What do you guys think? I like in spokane and do not do many long trips with the cruiser so 15 miles a day on the freeway is about it.

 

[4WD Toyota Owner Magazine]

They'll be fine. I run 5.29s on 35's and drive from Seattle to Moab, no problems.

 

[Nay]

4.56 is a waste of money. 4.88's minimum if you are going to regear. Or just put it in PWR mode and/or lock out OD and leave the 4.10's alone.

 

[Tapage]

4.88 no doubts ..

 

[Clutchee]

I hate to be that guy but search......4:88's has been discussed over & over.

 

[SR.GRINGO]

I have 4.88's I like them. Got them from reider racing.

 

[CreeperSleeper]

Personally, I think that if you are going to regear, you might as well go 5.29s. Chances are you are going to run a bigger tire eventually, or need a bit more power for towing, etc. You def don't want to do it twice...

 

[airlaird]

I just did it today (regered from 4:56's to 4:88's) I will post my results in a few days after the 4:88's are broken in (also pics of the before and after of the RPM's at different speeds on the speedo.
airlaird

 

[LukeO]

They'll be fine. I run 5.29s on 35's and drive from Seattle to Moab, no problems.

What kind of rpm's at highway speeds?

 

[4WD Toyota Owner Magazine]

Good question, it was around 2800 to 3000 when pushing 70+.

 

[alkaline747trio]

3k at 70 was probably pretty peppy going up hills

 

[MTNRAT]

At highway with 315 mtrs and 4.88s it is almost exactly 3000 rpm at 80 mph. Personally I would not like any more gear if doing much hwy at all.
Cheers,
Sean

 

[Tapage]

The question is .. what is your real top speed . ?

 

[cruisertom911]

You need to remember that this toyota 6 cyl is a torque motor. Yes, one might get some horsepower #'s out of one, it is not a V8.
5.29 have a very small pinion and some people might have luck with it, but it is a very small piece of metal w/ a torquey toyota motor. Look at the size of a 4.88 pinion compared to a 5.29.
Now, I am new to the 80 series, I am notgonna argue that. But I have seen and heard bad news w/ 5.29's. Twisting the pinion in the housing b/c it is to small. What about tarnsfer case options?.
Ya'll tell me. Gears, tires, motor, transfer case,transmission. What is the perfect combo?

 

[LukeO]

I'm contemplating 36" Swamper radials with 4:88's at the moment. To replace 315's and stock r/p.

Of course I'm also wondering if I want to keep the OME J's and add spacers up front or if I should go Slee 6" or 4".

 

[alkaline747trio]

Luke, you will be happier with the 4" or 6" springs than J's with spacers, atleast on the front.

 

[cruiserdan]

What kind of rpm's at highway speeds?

Most of the 315/75/16 tires I have seen the spec sheets on claim to have between 598 and 605 revolutions per mile.

4.88 x 600 = 2,928 driveshaft RPM at 60 mph.

2,928 / 60 = 48.8 rpm per one mph.

75 x 48.8 = 3,660 driveshaft RPM (at 75 MPH)

3rd gear is direct so, with a locked converter, rpm at 75 mph would be ~3,660 RPM.
4th gear in a 343 is .753 to 1 so that makes it ~2,756 RPM at 75 mph in OD, with a locked converter.


In contrast, stock tires, 4.1 gears and 75 mph in OD is ~2,570 RPM.

 

[landtank]

Most of the 315/75/16 tires I have seen the spec sheets on claim to have between 598 and 605 revolutions per mile.

4.88 x 600 = 2,928 driveshaft RPM at 60 mph.

2,928 / 60 = 48.8 rpm per one mph.

75 x 48.8 = 3,660 driveshaft RPM (at 75 MPH)

3rd gear is direct so, with a locked converter, rpm at 75 mph would be ~3,660 RPM.
4th gear in a 343 is .753 to 1 so that makes it ~2,756 RPM at 75 mph in OD, with a locked converter.


In contrast, stock tires, 4.1 gears and 75 mph in OD is ~2,570 RPM.

I figured you would be all tuckered out by now with the math thing

 

[alkaline747trio]

He's just on a roll...

 

[Tools R Us]

5.29 have a very small pinion and some people might have luck with it, but it is a very small piece of metal w/ a torquey toyota motor. Look at the size of a 4.88 pinion compared to a 5.29.

Here is the pic, Brother Rob's 4.88 on the left, my 5.29 on the right. The 5.29 is somewhat smaller, but not "a very small piece of metal" A bunch of the local rock buggy guys have gotten away from the "internet common knowledge" that you have to run 4.10's for strength and started to run deep gears (even 5.71's) with good success as long as they are setup properly.