4.88s on 33s? (1 Viewer)

[Nay]

I have been toying with the idea of going to 4.88 gears on my 285/75R16 MTR tires.

The drawback? I'm 8 hours from anywhere interesting. The posted speed on the interstate here is 75 and 80 is the norm.

So... how would 4.88s on 33" tires handle being run at 80MPH? What RPM would I be running? Is it OK for my 7200 lb (full camping load) truck to run at that for 12 hours at a shot?

If you like driving 80 mph, don't get 4.88's unless you plan on getting 35's - you'll be cruising at over 3K RPM and NVH will be an issue (unless you don't care about NVH). Of course, this works in your favor to get the 35's. Ask me how much time I have spent noodling around the idea of adding 1" of lift to my FOR setup with spacers and going to a standard 10" Bilstein shock with 37's.

Seems I was up late last night ordering 1" wheel spacers for some reason or another . But I won't do it, really I won't. I don't need 37's. There is no good excuse even though they only weigh 3 lbs more than my 35's and less than 35" Toyos. No reason at all.

Get the LT MAF mod if you have a 95+ and want the lower gears, the higher RPMs are shockingly smooth - it runs at 2,900 @ 75 mph like it used to run at 2,500 RPM.

 

[Nay]

No, he was right before...

You'd be amazed how long it takes me to get anywhere, I just go absolutely fawking nuts driving around at 70 mph. So much so that when I get behind the wheel of the minivan I have to get my manhood back and nail that thing at 90 mph. It does need spinning rims and some neon undercarriage lights, though, for full effect.

 

[24HOURSOFNEVADA]

I've been searching for the gear ratio calculator but most if not all is with 35s. Curiouse as to what my rpms would be like at 60-65-70 mph. anyone have a simple math formula?

The most complete one I can find. They even have my aussie 4 speed in there.


Gear Ratio Calculator

 

[FJBen]

Seems I was up late last night ordering 1" wheel spacers for some reason or another . But I won't do it, really I won't. I don't need 37's. There is no good excuse even though they only weigh 3 lbs more than my 35's and less than 35" Toyos. No reason at all.

RPM.

I'm not sure why you keep saying the 35" & 37" Trxus are so much lighter than the Toyo's.

Per Interco:
35x12.50x16 Trxus = 76lbs 35" OD.....19/32
37x12.50x16 Trxus = 79lbs 37.2" OD.....21/32

Per Toyo:
315x75x16 Toyo = 76lbs 34.9" OD.....21/32

 

[Nay]

I'm not sure why you keep saying the 35" & 37" Trxus are so much lighter than the Toyo's.

Per Interco:
35x12.50x16 Trxus = 76lbs 35" OD.....19/32
37x12.50x16 Trxus = 79lbs 37.2" OD.....21/32

Per Toyo:
315x75x16 Toyo = 76lbs 34.9" OD.....21/32

My fault, I thought the Toyos were something like 83 lbs. Not that it really matters one way or the other

 

[Atoyot1031]

I'm not sure why you keep saying the 35" & 37" Trxus are so much lighter than the Toyo's.

Per Interco:
35x12.50x16 Trxus = 76lbs 35" OD.....19/32
37x12.50x16 Trxus = 79lbs 37.2" OD.....21/32

Per Toyo:
315x75x16 Toyo = 76lbs 34.9" OD.....21/32

FJBen,
Do you know if that is for the Interco radial or bias? I think they offer it in both.

 

[Hilux]

Some of you guys might think those LOOOWWWW rpm's might be saving you. But I say, the 1FZ is not a boat motor. How would a motorcycle run with 44s?

I say the driving by ear that allot of you are doing is bad for you. IMO, it's lugging the motor. But since your ears are tuned to a Chebby and not a Toyota this is what you get.

I'm not saying that a 1FZ won't pull those tires on stock gears but I am saying that I bet a 1FZ is highly susceptible to drag. And lugging is drag...ie. "I'ma drink mo gas!" . Running on the tips of your toes(higher rpms) means less drag, but the higher rpms usually makes it a draw.


OP, IMO get the original tire dia, the one on the sticker in the door jam. Along w/ your OD ratio, compute that in the gear calculator, and compare that rpm at mph DIRECTLY to the hypothetical tire and gear you want to run. 33s match 4:88s, 35s match 5:29s.

 

[Atoyot1031]

OP, IMO get the original tire dia, the one on the sticker in the door jam. Along w/ your OD ratio, compute that in the gear calculator, and compare that rpm at mph DIRECTLY to the hypothetical tire and gear you want to run. 33s match 4:88s, 35s match 5:29s.

Hypothetically that sounds nice. In my experience, it just ain't so. Otherwise, the speedo would match up. What are you running?

 

[FJBen]

FJBen,
Do you know if that is for the Interco radial or bias? I think they offer it in both.

I don't know that they offer the Trxus in both, if they do then they aren't putting it on their site.

TrXus MT / STS :: Interco Tire