3.08s and 33s

[Gavin.reid]

Okay so I have an 81 chevy k10 with a 10 bolt front and a 12 bolt rear with 3.08s what's the biggest tires I should run? I'm not going to be doing much highway use mostly just offroading I would need to be able to drive 60mph for a little while occasionly.

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[Craig 85]

My 79 1/2 had 33's with 3.08's. Definitely not fast, especially with all the smog equipment, but did OK. I turned about 2000 RPM at 65. I swapped to 3/4 running gear with 4.10's and 33's. Better off the line and up to freeways speeds, but I was then turning almost 3000 RPM at 65. I think my truck had the factory 150 HP 350. It didn't have much to give after 60-65 MPH.

 

[Gavin.reid]

My 79 1/2 had 33's with 3.08's. Definitely not fast, especially with all the smog equipment, but did OK. I turned about 2000 RPM at 65. I swapped to 3/4 running gear with 4.10's and 33's. Better off the line and up to freeways speeds, but I was then turning almost 3000 RPM at 65. I think my truck had the factory 150 HP 350. It didn't have much to give after 60-65 MPH.

I should be fine then not really looking for speed anyway and my 350s mildly built closer to 325hp

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[Splandman]

My 79 1/2 had 33's with 3.08's. Definitely not fast, especially with all the smog equipment, but did OK. I turned about 2000 RPM at 65. I swapped to 3/4 running gear with 4.10's and 33's. Better off the line and up to freeways speeds, but I was then turning almost 3000 RPM at 65. I think my truck had the factory 150 HP 350. It didn't have much to give after 60-65 MPH.

What trans? I assume a TH 350 or 400, because I have 4.10's and 33's and only turn 2k at 65, I have overdrive though. At least I have it for a few weeks at a time until trans goes out.

 

[Gavin.reid]

What trans? I assume a TH 350 or 400, because I have 4.10's and 33's and only turn 2k at 65, I have overdrive though. At least I have it for a few weeks at a time until trans goes out.

I have an sm465 and 3.08s how do you think it'll be for 33s off-road not much on road

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[Honky Kong jr]

I have an sm465 and 3.08s how do you think it'll be for 33s off-road not much on road

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Depends on what kinda off-roading your gonna do.

 

[Gavin.reid]

Depends on what kinda off-roading your gonna do.

Mostly mudding and a little rock crawling

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[Honky Kong jr]

Mostly mudding and a little rock crawling

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Low range in the case and 1st and 2nd for crawling and low range and 2nd for mud and keep the Rpms up. I have 36s and 373s and a big block with a th400 and 262 low range but I'm just playing in the mud. Well will be soon.

 

[Gavin.reid]

Low range in the case and 1st and 2nd for crawling and low range and 2nd for mud and keep the Rpms up. I have 36s and 373s and a big block with a th400 and 262 low range but I'm just playing in the mud. Well will be soon.

Sweet what size lift you run for 36s?


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[Honky Kong jr]

Sweet what size lift you run for 36s?


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6" and 2" body. Spring up front and add a leaf and shackle flip out back.

 

[Craig 85]

What trans? I assume a TH 350 or 400, because I have 4.10's and 33's and only turn 2k at 65, I have overdrive though. At least I have it for a few weeks at a time until trans goes out.

Mine was a TH-350.

 

[Mr. Gutwrench]

Your crawl ratio is around 40:1-52:1 (not sure which transfer case you have). Generally, rockcrawlers with a standard trans shoot for 100:1. My rock buggy with an auto was 55:1 crawl ratio and 39" tires and worked well for Western rockcrawling. Not sure the ideal for mudding, but it seems like you would be close. Mudders would want a higher ratio (lower numerically) for wheel speed.

 

[4WDKC]

3.42:1 with 33s was like 2500 in drive at 70, with the 700r4 first gear it was not fast off the line 373s or 410s with 33s.

 

[theblindchicken]

Sittin around 2800ish at 60-65 on the hwy for me.

TH350/NP203 with 4.11's and 35's.