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Bigger Tires on my G20 (31"x10.5x15) #749386
June 09th 2019 9:43 pm
June 09th 2019 9:43 pm
Joined: Jan 2014
Posts: 13
Loa, UT
I
intendwithin Offline OP
stranger
intendwithin  Offline OP
stranger
I
Joined: Jan 2014
Posts: 13
Loa, UT
I have 3.73 gearing in my differential and 28" in stock tires. I did a calculation that I found on Bleepin Jeep YouTube channel to find out what gearing I need to run my new tire sizes. It came out that I need a 4.11 ring and pinion.

I ordered the parts along with a Detroit TruTrac.

My question is: Do I have this correct? Or will the lower gearing suck ars?

Re: Bigger Tires on my G20 (31"x10.5x15) [Re: intendwithin] #749388
June 09th 2019 9:57 pm
June 09th 2019 9:57 pm
Joined: Jun 2010
Posts: 14,505
Van Diego California
frscke1 Offline
frscke1  Offline

Joined: Jun 2010
Posts: 14,505
Van Diego California
I went from 225 to 245 on my G30 without changing any gears .... still takes off like a jack rabbit N now I get better MPG. My white van has 4.10 gears from the factory. Id be more worried about tire rub when going bigger.

My red 4X has a 3" lift to fit 315/75/16 12" wide with 4.56 gears ft N rr. It came to me with 275/75/16 tires I changed no gears on that one either.

You might want to try running the new tires then order gear paks.

And both vans still have way more motor than tire ....

[Linked Image]

[Linked Image]


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: Bigger Tires on my G20 (31"x10.5x15) [Re: frscke1] #749461
June 11th 2019 11:18 am
June 11th 2019 11:18 am
Joined: Jan 2014
Posts: 13
Loa, UT
I
intendwithin Offline OP
stranger
intendwithin  Offline OP
stranger
I
Joined: Jan 2014
Posts: 13
Loa, UT
frscke1 thank you, it sounds like you already have bigger gear ratios in your rigs than mine does (3.73). i already ordered a 4.11 ring and pinion set. My current diff has been howling at me since i bought the van two years ago. after a bunch of looking around my guess is the backlash is super loose... I may just stick the 4.11 in anyway because I already bought it.

I really like your rigs man!


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