GMC FAQ » Gmc Jimmy

Biggest tires to fit 88-98 Chevy/GMC

admin — Sat, 10 Apr 2004 00:00:00 +0000

Question:

Yes, but we don’t offer warranties I have a 1990 GMC FS jimmy that has 31xwhatevers on it, look small but don’t rub I also have a 1985 K5 Blazer that has tires that MEASURE 31″ tall, but I don’t know what the size of the tire is. Personally too lazy to go look. Neither tire is close to rubbing anything, but these are both 4×4 vehicles, which are a little higher (at least up front) from the factory. ~KJ~

….. rather ask someone that owns a 88-98 truck and that knows for sure what works and doesn’t. Ask the tire shop, they should know. ~KJ~ I have 265/75-16s on it now (I think the stock rim is 16X7 or 7.5) and I just bought some 16×8s….. The 265s have “plenty” of room. I may try a 31″ or so… just wondering how wide a tire they offer, I’m probably going with a set of BFGs all terrain or something like that. What is the biggest and widest that I can fit on a 16X8 rim with out rubbing? 32″? What would that be a 285/75-16? I’d like to go as wide as possible also….any ideas fellas? Thanks ~John John, I have 30’s on my 88′ C1500 stock height, and any bigger would be getting too close to the fender for my comfort. 31’s might fit, but 32’s would be rubbing for sure. I was running 255/60/15’s on her (10.2″ wide) for awhile and wouldn’t want to go any wider. Although there was more than enough room to go wider, they looked great, any more would have looked dumb as hell. So, you’re looking for a tire around 30″ diameter and 10-11″ wide. 265/70/16 should be perfect (30.6″ diameter/10.7″ wide). Better have a nice low rear-end gear or you’ll never get moving with those Doc

Response:

What is the biggest and widest that I can fit on a 16X8 rim with out rubbing? 32″? What would that be a 285/75-16? I’d like to go as wide as possible also….any ideas fellas? Thanks ~John

Response:

What is the biggest and widest that I can fit on a 16X8 rim with out rubbing? 32″? What would that be a 285/75-16? I’d like to go as wide as possible also….any ideas fellas? Thanks ~John

John, I have 30’s on my 88′ C1500 stock height, and any bigger would be getting too close to the fender for my comfort. 31’s might fit, but 32’s would be rubbing for sure. I was running 255/60/15’s on her (10.2″ wide) for awhile and wouldn’t want to go any wider. Although there was more than enough room to go wider, they looked great, any more would have looked dumb as hell. So, you’re looking for a tire around 30″ diameter and 10-11″ wide. 265/70/16 should be perfect (30.6″ diameter/10.7″ wide). Better have a nice Doc

Response:

I have a 90 model with 285-75-16’s on the stock wheels, (Z71, btw) the front end isn’t cranked up, and i have no scrubbing on mine. i suppose it may differ according to tires and wheels, but if it’s 4×4 you should be able to fit the same as mine without a problem. Good luck TB

What is the biggest and widest that I can fit on a 16X8 rim with out rubbing? 32″? What would that be a 285/75-16? I’d like to go as wide as possible also….any ideas fellas? Thanks ~John

Response:

What is the biggest and widest that I can fit on a 16X8 rim with out rubbing? 32″? What would that be a 285/75-16? I’d like to go as wide as possible also….any ideas fellas? Thanks ~John John, I have 30’s on my 88′ C1500 stock height, and any bigger would be getting too close to the fender for my comfort. 31’s might fit, but 32’s would be rubbing for sure. I was running 255/60/15’s on her (10.2″ wide) for awhile and wouldn’t want to go any wider. Although there was more than enough room to go wider, they looked great, any more would have looked dumb as hell. So, you’re looking for a tire around 30″ diameter and 10-11″ wide. 265/70/16 should be perfect (30.6″ diameter/10.7″ wide). Better have a nice Doc

Response:

Ask the tire shop, they should know. ~KJ~

I have 265/75-16s on it now (I think the stock rim is 16X7 or 7.5) and I just bought some 16×8s….. The 265s have “plenty” of room. I may try a 31″ or so… just wondering how wide a tire they offer, I’m probably going with a set of BFGs all terrain or something like that. What is the biggest and widest that I can fit on a 16X8 rim with out rubbing? 32″? What would that be a 285/75-16? I’d like to go as wide as possible also….any ideas fellas? Thanks ~John John, I have 30’s on my 88′ C1500 stock height, and any bigger would be getting too close to the fender for my comfort. 31’s might fit, but 32’s would be rubbing for sure. I was running 255/60/15’s on her (10.2″ wide) for awhile and wouldn’t want to go any wider. Although there was more than enough room to go wider, they looked great, any more would have looked dumb as hell. So, you’re looking for a tire around 30″ diameter and 10-11″ wide. 265/70/16 should be perfect (30.6″ diameter/10.7″ wide). Better have a nice low rear-end gear or you’ll never get moving with those Doc

Response:

….. rather ask someone that owns a 88-98 truck and that knows for sure what works and doesn’t.

Ask the tire shop, they should know. ~KJ~ I have 265/75-16s on it now (I think the stock rim is 16X7 or 7.5) and I just bought some 16×8s….. The 265s have “plenty” of room. I may try a 31″ or so… just wondering how wide a tire they offer, I’m probably going with a set of BFGs all terrain or something like that. What is the biggest and widest that I can fit on a 16X8 rim with out rubbing? 32″? What would that be a 285/75-16? I’d like to go as wide as possible also….any ideas fellas? Thanks ~John John, I have 30’s on my 88′ C1500 stock height, and any bigger would be getting too close to the fender for my comfort. 31’s might fit, but 32’s would be rubbing for sure. I was running 255/60/15’s on her (10.2″ wide) for awhile and wouldn’t want to go any wider. Although there was more than enough room to go wider, they looked great, any more would have looked dumb as hell. So, you’re looking for a tire around 30″ diameter and 10-11″ wide. 265/70/16 should be perfect (30.6″ diameter/10.7″ wide). Better have a nice low rear-end gear or you’ll never get moving with those Doc

Response:

What is the biggest and widest that I can fit on a 16X8 rim with out rubbing? 32″? What would that be a 285/75-16? I’d like to go as wide as possible also….any ideas fellas? Thanks ~John

It depends greatly on 2wd or 4wd…. a 4wd can go as big as the 285-75/16.. the biggest I’ve seen on a 2wd is a 235-85/16 and it rubs like a bastard at the locks. -Bret

Response:

265’s are the metric version of a 32″x10.5″ tire, going to a 31 would result in a shorter tire. if you want to go wider, try a 32X11.5. a 285-75/16 is slightly taller than a 33X12.5 and almost exactly the same width. HTH, Bret What is the biggest and widest that I can fit on a 16X8 rim with out rubbing? 32″? What would that be a 285/75-16? I’d like to go as wide as possible also….any ideas fellas? Thanks ~John John, I have 30’s on my 88′ C1500 stock height, and any bigger would be getting too close to the fender for my comfort. 31’s might fit, but 32’s would be rubbing for sure. I was running 255/60/15’s on her (10.2″ wide) for awhile and wouldn’t want to go any wider. Although there was more than enough room to go wider, they looked great, any more would have looked dumb as hell. So, you’re looking for a tire around 30″ diameter and 10-11″ wide. 265/70/16 should be perfect (30.6″ diameter/10.7″ wide). Better have a nice Doc

Response:

Which rear end do I have??

admin — Fri, 20 Jun 2003 00:00:00 +0000

Question:

A complete list of all GM RPO codes can be found at http://tinyurl.com/eycv GT4 Axle Rear 3.73 Ratio GT5 Axle Rear 4.10 Ratio (DUP With GT8) GU4 Axle Rear 3.08 Ratio G65 Level Control Manual, Self-Adjusting G69 Level Control Auto, Air, HD G80 Axle Positraction Limited Slip HMc

Response:

Thanks for info and the link, kind of was hoping I had the 3.73 axle ratio. may be a long shot but would anyone know the difference in fuel economy between the two axle ratio’s.

A complete list of all GM RPO codes can be found at

http://tinyurl.com/eycv GT4 Axle Rear 3.73 Ratio GT5 Axle Rear 4.10 Ratio (DUP With GT8) GU4 Axle Rear 3.08 Ratio G65 Level Control Manual, Self-Adjusting G69 Level Control Auto, Air, HD G80 Axle Positraction Limited Slip HMc

Response:

Yup

What is their failure mode? “along with the G80″ you poor soul Wonderful, yet another G(enerally) M(ediocre) component that eats its young on a regular basis? VLJ

Response:

Total absolutely total, devastating destruction

Yup What is their failure mode? “along with the G80″ you poor soul Wonderful, yet another G(enerally) M(ediocre) component that eats its young on a regular basis? VLJ

Response:

Missed one, GU6 is 3.42. In the S-trucks anyway… A complete list of all GM RPO codes can be found at http://tinyurl.com/eycv GT4 Axle Rear 3.73 Ratio GT5 Axle Rear 4.10 Ratio (DUP With GT8) GU4 Axle Rear 3.08 Ratio G65 Level Control Manual, Self-Adjusting G69 Level Control Auto, Air, HD G80 Axle Positraction Limited Slip HMc

Response:

http://tinyurl.com/eycv Posted via Newsfeeds.Com, Uncensored Usenet News http://www.newsfeeds.com – The #1 Newsgroup Service in the World! Over 80,000 Newsgroups – 16 Different Servers!

Response:

Same thing for me, I just cut and psted it into word and printed and saved.

Has anyone gotten the entire listing .pdf file to come up at this site. I wanted to pull it up to save it and it just keeps coming up not found? I have some of the codes but wouldn’t mind a better listing. Thanks folks Steve W. A complete list of all GM RPO codes can be found at http://tinyurl.com/eycv Posted via Newsfeeds.Com, Uncensored Usenet News http://www.newsfeeds.com – The #1 Newsgroup Service in the World! Over 80,000 Newsgroups – 16 Different Servers!

Response:

HI all, I was checking out the post “which rear end do I have” You guys have me curious now, I checked my VIN # and this website http://tinyurl.com/eycv , couldn’t find my rear end code in there, anyone help me out? GTE is the code I have in my VIN # K19 are the three #’s after GTE if that helps 99 Z71 4X4 Thanks!

Response:

The codes at that web site are RPO codes, and not part of your VIN. Look in your glove compartment, you will find a sticker with a whole bunch of 3-letter/digit codes. Those are the RPO codes that represent all of the installed components of your vehicle. RPO stands for Regular Production Options. AFAIK, this link– http://tinyurl.com/fdw9 should be a 100+ page document in .pdf format that contains all of GM’s RPO codes. HMc

Response:

With your valve stem straight down, make a chaulk mark on you r driveshaft. Have someone drive truck straight ahead one tire rotation. Count number of turns of driveshaft until the valve stem is straight down again. If mark has gone around just over 4 times, it’s a 4.10. Three and three quarters turns, it’s a 3.73. Just under3 and one half turns, a 3.42. Just over 3 turns, a 3.08. Quicker than tryin to cipher a code!

Response:

I posted the same thing, but it did not show in the group??? john

Response:

“along with the G80″ you poor soul

GT5 in mine, along with the G80. My 2003 has a 3.73 posI rear end and the code in the glovebox is GT4. I also had a 2000 with a 3.42 posI rear and the 3.42 gears were standard that year for an LS, standard cab, short bed with a 4.8 V-8. Good luck, Karl

Response:

?????

“along with the G80″ you poor soul GT5 in mine, along with the G80. My 2003 has a 3.73 posI rear end and the code in the glovebox is GT4. I also had a 2000 with a 3.42 posI rear and the 3.42 gears were standard that year for an LS, standard cab, short bed with a 4.8 V-8. Good luck, Karl

Response:

The G80 is not what one would call ‘durable’ it classifies as a ‘locker’, but just barely

????? “along with the G80″ you poor soul GT5 in mine, along with the G80. My 2003 has a 3.73 posI rear end and the code in the glovebox is GT4. I also had a 2000 with a 3.42 posI rear and the 3.42 gears were standard that year for an LS, standard cab, short bed with a 4.8 V-8. Good luck, Karl

Response:

“along with the G80″ you poor soul

Wonderful, yet another G(enerally) M(ediocre) component that eats its young on a regular basis? VLJ

Response:

yup

“along with the G80″ you poor soul Wonderful, yet another G(enerally) M(ediocre) component that eats its young on a regular basis? VLJ

Response:

GT5 — 4.10 gears — Pacifism – The theory that if they’d fed Jeffrey Dahmer enough human flesh, he’d have become a vegan.

Posted via Newsfeeds.Com, Uncensored Usenet News http://www.newsfeeds.com – The #1 Newsgroup Service in the World! Over 80,000 Newsgroups – 16 Different Servers!

Response:

GT5 in mine, along with the G80.

My 2003 has a 3.73 posI rear end and the code in the glovebox is GT4. I also had a 2000 with a 3.42 posI rear and the 3.42 gears were standard that year for an LS, standard cab, short bed with a 4.8 V-8. Good luck, Karl

Response:

GU6 — 3.42 rear gears G80 — Axle Positraction, AKA Limited slip Eaton rear end — Pacifism – The theory that if they’d fed Jeffrey Dahmer enough human flesh, he’d have become a vegan.

I also am wondering what I have. I have a 2001 GMC Jimmy, 4×4. I have 2 numbers that begin with G. But they are on a white sticker in the glove box. GU6 G80 Thanks in advanced. Take the VIN to a dealer, they should be able to print an options list for you. If they won’t, find the yellow sticker in the glovebox and post the 3-digit code starting with G. I just bought a 2000 CHEVROLET K1500 SILVERADO through an auction and I was wondering which part of the VIN gives u that info and how do I translate it. part of the vin has a T4 in it I thought is was those 2 digits but not sure and if it is not sure which rear end it is. Thanks

Posted via Newsfeeds.Com, Uncensored Usenet News http://www.newsfeeds.com – The #1 Newsgroup Service in the World! Over 80,000 Newsgroups – 16 Different Servers!

Response:

Take the VIN to a dealer, they should be able to print an options list for you. If they won’t, find the yellow sticker in the glovebox and post the 3-digit code starting with G. I just bought a 2000 CHEVROLET K1500 SILVERADO through an auction and I was wondering which part of the VIN gives u that info and how do I translate it. part of the vin has a T4 in it I thought is was those 2 digits but not sure and if it is not sure which rear end it is. Thanks

Response:

I just bought a 2000 CHEVROLET K1500 SILVERADO through an auction and I was wondering which part of the VIN gives u that info and how do I translate it. part of the vin has a T4 in it I thought is was those 2 digits but not sure and if it is not sure which rear end it is. Thanks