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Old 03-20-2021, 05:10 AM   #221
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Quote:
Originally Posted by cmadmaxman View Post
I'm on my 3rd set of these, and as long as Goodyear is making em, I will be using em!

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Nice! Glad you like them!! They take a while to arrive though. I got a call from the fire shop and apparently they are delayed until June now.
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Old 03-20-2021, 07:21 AM   #222
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Nice! Glad you like them!! They take a while to arrive though. I got a call from the fire shop and apparently they are delayed until June now.

I had to wait 4 weeks for mine to arrive. Goodyear apparently only makes them in batches once or twice/year. Well worth the wait. I would, however, remind the shop to make sure you are not receiving some NOS several years old.
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Old 03-21-2021, 04:40 AM   #223
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Yeah, good point. But I don’t think that will be the case as they mentioned that being before the season Goodyear didn’t have them in yet so I suspect it is the case you mentioned above that they only make a few runs a year.
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Old 03-24-2021, 04:46 PM   #224
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Hi Rob, just a heads up, I grabed a shot off the tires I settled for on my rears, they are a "Traction" tire for road and dirt.
"All rounder" ties that your going for might leave you stranded as they are primarily designed for road going only. Good for steer but not grip/drive.
I measured the circumference off my R8 fronts against my 225/70r the R8 travell 6" further per revolution. Thats quite a distance, not shure off the final drive gearing 4-1? after motor revs.
Tire manufacturers seem to be moving to the metric sizes unfortunately our Rigs arn't designed for.
Continental HSR 225/70R regroovable Nitrogen filled, 5years old 1000miles kept covered withe shade cloth draped over, with marine zinc anodes used as securing weights, it allows rubber to breath not swet like a full plasic cover, which posible encourage rot..
Shade cloth is White and used to cover winery grapes, long life.
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Old 03-24-2021, 07:03 PM   #225
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Hi Voltair, so you run the 8R in the front and the 225/70 in the rear? Do you have 4 speed gearbox or 3 speed?
I’ll have to look how they are for “drive” indeed. I believe soMe have used them all around. Maybe they can comment on the driving grip? Peter, do you run them in the back? How do they grip? Thanks!
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Old 03-24-2021, 07:53 PM   #226
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Just a point of interest, the Goodyear 647 are mud and snow rated and have the emblem molded into the sidewall.
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Old 03-24-2021, 08:49 PM   #227
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Quote:
Originally Posted by Roby466 View Post
Hi Voltair, so you run the 8R in the front and the 225/70 in the rear? Do you have 4 speed gearbox or 3 speed?
I’ll have to look how they are for “drive” indeed. I believe soMe have used them all around. Maybe they can comment on the driving grip? Peter, do you run them in the back? How do they grip? Thanks!

Could it be that the G647 Voltair is referring to, are different than the ones we get on this side of the pond? His description does not match the G647 RSS 8R19.5 I am familiar with and have been using for many years. I never noticed any "grip" issues, but I do not live in an freeze challenged region, nor do i tend to take a 17K pound vehicle off road frequently. The use of 245's per his comment is prohibit for 8R rims.



Quote:
Originally Posted by Voltair View Post
I can only find G647 as a ref, as I need to find suitable fronts. If above Goodyear tire is correct they are a narrow 225/70 19.5 = not the same as 8R 19.5 in running circumference as you wanted! Although they are a steer tires good for fronts for ease off steering and tracking but hopless fore rears, no lugs for grip and rears need to be atleast 245/70 19.5 a wider tire for grip on grass ect and not crowned like for fronts! They are designed fot light truck on paved roads only delivering bread!
If I have the wrong tire inf then discard the above. You also put an "s" in your tire description?
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Old 03-25-2021, 04:16 AM   #228
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That's what I thought Peter about the tires, maybe they are different. From the picture, they looked fine for drive axles.

Indeed, I would have to change rims to fit larger tires... so for now I am sticking with the skinny ones as long as they are available.
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Old 03-25-2021, 08:10 AM   #229
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Roby, the Goodyear G647's are not that narrow compared to the China Pops!

Over an 1" wider. You will like them.

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Old 03-25-2021, 08:57 AM   #230
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I see that the Sumitomo ST718 is much cheaper than the G647s on
Amazon. They are both 8R19.5 tires.

Sumitomo at $220.22
https://www.amazon.com/gp/product/B0...3H6ORZTP&psc=1

Goodyear at $372.99
https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1

Are the Sumitomo tires a bad choice?
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Old 03-25-2021, 10:46 AM   #231
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I put on Sumitomo 718 (225/70R 19.5) on Aug 19, 2011. Ten years later, I now have 9200 miles on them with no sign of tread wear. Sad that they will have to be replaced before future trips since they are 10 years old. They were $1651 ($236.95 ea) out the door, including mounting/balancing, 10 years ago. Its a shame that they need to be replaced with only 9200 miles on them. I had no issues with them. All highway flat and mountain driving to Yosemite, Burning Man, Oregon Dunes. Only thing that bothered me is they have a very low speed rating (maybe 55mph if I remember correctly). I really don't know if that meant much on a MH that doesn't see over 60mph. I ran them at 70lbs front and 65lbs rear.


My dad ran Goodyear G647's. I still have one as a spare, but I'm sure it is 20 years old! I think I will go with the G647's the next time around. I will never run anything but Michelin's on my pickup, but think G647's will be my next choice on MH.





Quote:
Originally Posted by Air345Fly View Post
I see that the Sumitomo ST718 is much cheaper than the G647s on
Amazon. They are both 8R19.5 tires.

Sumitomo at $220.22
https://www.amazon.com/gp/product/B0...3H6ORZTP&psc=1

Goodyear at $372.99
https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1

Are the Sumitomo tires a bad choice?
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Old 03-25-2021, 12:10 PM   #232
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Unfortunately in Canada the choice is slim... I could bring some in from the US myself but that is another complication.
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Old 03-25-2021, 06:00 PM   #233
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I was looking around for a suitable steer tire for my fronts to replace my R8, that I cant find a replacment for , sorta getting pushed into the metric sizes, unfortunately!
I'll go for the same tires your'v chosen for my front replacments, a good steer tire but will be a compromise for a drive traction tire on rears, for our RV we park on sloping wet grass at times cos thats what we doo.. A Chunky, Flat, ie non crowned tire that are designed primarily for good traction in the rough and on road.
I have a Turbo 475 3 speed a strong spur cut box, same as yours.If I had to replace one day it would be fitted with a Manual 5 or 6 speed. Autos don't benifit from stored inertia ie watch trucks get up to speed befor hitting hills mostly all run manual box's for this reason, and there is a reason.
You described your 345 as a "THING" something to do with hiway driving, if set right these handel very well , take a look at your chasis above passanger front tire and can you see a Blue painted steering part? You may know about them allready called Super Steers. Those reto fitted parts sort the wondering hiway issue!
Rus
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Old 03-26-2021, 02:57 PM   #234
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Thanks! It doesn’t handle badly on the highway to be honest. I said that mostly because stopping at high speed and going 75mph with it may be a different story
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Old 03-26-2021, 03:31 PM   #235
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Yes I made a bad typo mistake on a an important subject 245/70 instead off 225/70.. I have read that 245/70 on rear can cause side walls to tough= not good!
But my subsequent posts I thought had clearer and correct inf I hope.
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Old 03-26-2021, 04:04 PM   #236
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Quote:
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Yes I made a bad typo mistake on a an important subject 245/70 instead off 225/70.. I have read that 245/70 on rear can cause side walls to tough= not good!
But my subsequent posts I thought had clearer and correct inf I hope.

Yes, indeed, all good info. I didn't even know that they made the G647 in a narrow or slim version. I am not sure if that would be my first choice. The reason why I mentioned the 245 being prohibited on 8R rims, besides the dual spacing, is that they require a min 6.75 rims and would cup the tire. We did establish in previous conversations that the 225/70 19.5 are suitable for the 8R 6.0" rims.

I would be tempted to run the Michelin 225/70 19.5 before the slim G647. But I have the 4l80e trans with overdrive.
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Old 03-26-2021, 06:23 PM   #237
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1988 345... The adventure begins!

Alright, waiting for tires is no excuse to not spend more money on the 345!
I got this new starter today, this small high torque geared starter should fix the hot start issues! Impressive how much smaller it is!

I also got a new dual Propane and CO detector to replace the ancient Newtec unit that was there before. Better be safe!Click image for larger version

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Old 03-26-2021, 06:32 PM   #238
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Old 03-27-2021, 03:37 PM   #239
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A very quike observation,
You can run another neg luged end cable from the battery post straight to the Bellhousing, use one off the thoes large bolts there. The original flexable webed neg cable to the chasis has become less effective over the years. That is how I fixed my Hot Start problem also brighter dash n tail lights:}
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Old 03-28-2021, 04:04 AM   #240
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Thanks Voltair, I will do that as well. Good idea and cheap insurance, definitely worth it.
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