‘67 GTX, P275-60-15s, will they fit poll.

[Rd 92 west]

I ran 275 60 15 on this coronet, with 7 inch C body road wheels. Only modification was

I swapped in slightly longer shock absorbers which might have let the axle hang a little lower. The 275's made a 318 car look like it was packing at least a 383.
My red belvedere got longer shocks as well. No other modification. It's running 11x3 drums on the back.

 

[gtx6970]

I have 245s on my 66. To get them off the car I have to jack it up at the ft spring hanger and let the tire/rim hang

When the time comes, I plan to upgrade to 255s . Keeping them on 15x7 inch rims ( not sure of the backspacing ) With the height level my car sits.
I dont see any way in hades I can get a 275-60 on mine

 

[lewtot184]

7 1/2” with 5 1/8” bs.

i think 5 1/8" back space is going to put the sidewall into the spring.

 

[lewtot184]

I went out in the garage and measuref mine. I'm 1"" from the leaf spring and 1.25" from the quarter panel lip. You might clear the spring by .5" or so. Wild card is if the dana axle is wider than my 8.75.

 

[BSB67]

i think 5 1/8" back space is going to put the sidewall into the spring.

Yep. I think it will be right there.

In my limited past experience on two other cars, I got away with very very little leaf springs clearance without contact. But the tires rubbed the inner wheel on occasion. I suspect this will be the case on this car too.

 

[lewtot184]

Yep. I think it will be right there.

In my limited past experience on two other cars, I got away with very very little leaf springs clearance without contact. But the tires rubbed the inner wheel on occasion. I suspect this will be the case on this car too.

I have more room than i thought possible. I don't know how much you need for tire flex. May depend on how you drive.

 

[BSB67]

I have more room than i thought possible. I don't know how much you need for tire flex. May depend on how you drive.

Thanks Lew. It sounds like your car has considerably more room than the 67’s.

 

[ckessel]

I forgot to add on that when I pull a wheel/tire out, the diff is at full droop with the shocks attached. Plus let the air out.

 

[Don Frelier]

Here's a couple of mine with the 8" magnums and the 255/60
I was jacking it up to do something, exactly what I do not recall.

 

[BSB67]

I forgot to add on that when I pull a wheel/tire out, the diff is at full droop with the shocks attached. Plus let the air out.

Ouch. Thanks for that clarification. For your previous post I was thinking “just let the suspension hang.”. But you need to do both.

 

[BSB67]

Here's a couple of mine with the 8" magnums and the 255/60
I was jacking it up to do something, exactly what I do not recall.
View attachment 1978358
View attachment 1978359
View attachment 1978360

Such a nice looking car

 

[R413]

The wheels came last evening. Mounted them without the tires. They center pretty well. I’ll have my local guy mount the 275s if he has them and has time. He’s good with me doing a trial.

I won’t be cutting or massaging anything. If they don’t fit they’ll go back.

If they fit, then the tougher decision.

Well they may fit but when you drive they will rub without modifying the outer wheelhouse.

The wheels need to be better fit than pretty well, this is a game of 1/8" I had to have 2 different offsets on the wheels to fit my car. Each side is different.

With 66/67 wheel arches, taller is also an issue.

I had a heck of a time even getting 205/75/15 up in there.

Needed full spring extension, and even had to wiggle after that.

There IS a pronounced bump out in the upper, outer wheel well that severely interferes with a wider tire if the rear end doesn't sit high enough.
I believe it is more of a structural roof/C pillar support issue (careful, lots of stuff welded together there).

There is nothing structural in there down low where the bump is.

See photo of 275/60/15's on it, notice the suspension is not raised in the back, we cannot see the top of the wheel. Photo of a photo so not the best.

 

[BSB67]

Well they may fit but when you drive they will rub without modifying the outer

Good information in your post. Thanks.

How much space do you think is needed between the tire and outer wheel house?

Same question for the clearance between the inner wheel house?

 

[Sam69sat]

Good information in your post. Thanks.

How much space do you think is needed between the tire and outer wheel house?

Same question for the clearance between the inner wheel house?

Enough so when you turn or hit a bump or hit a bump and turn at the same time it doesn't rub. Stiffer suspension, rear sway bar, rear suspension height could change space requirements. Should be clear now.

 

[66 Sat]

I ran 275 60 15 on this coronet, with 7 inch C body road wheels. Only modification wasView attachment 1978305 I swapped in slightly longer shock absorbers which might have let the axle hang a little lower. The 275's made a 318 car look like it was packing at least a 383.
My red belvedere got longer shocks as well. No other modification. It's running 11x3 drums on the back.

I thought the Coronets have slightly more space than the 66/67 Belevedere/Satellites? Maybe due to the longer wheelbase, pushing the rear arch further away from the roof line intersection?

 

[RemCharger]

I thought the Coronets have slightly more space than the 66/67 Belevedere/Satellites? Maybe due to the longer wheelbase, pushing the rear arch further away from the roof line intersection?

The coronets have a bit of "hip" to them , and the plymouths are flat sided

 

[R413]

Good information in your post. Thanks.

How much space do you think is needed between the tire and outer wheel house?

Same question for the clearance between the inner wheel house?

you will never have enough space, it will rub on uneven driveways. More so with people in the back seat.

Also take off the undercoating in the wheelwell and that will gain you tire some clearance.

 

[BSB67]

Enough so when you turn or hit a bump or hit a bump and turn at the same time it doesn't rub. Stiffer suspension, rear sway bar, rear suspension height could change space requirements. Should be clear now.

That made me chuckle a little.

If they fit, that will be the tough decision. And really what I was hoping would bubble up here in the discussion. But maybe premature as I haven’t installed them yet. Suspension compression with body roll. I don’t have a clue what I might need. Stock springs at stock height. No suspension upgrades.

 

[RemCharger]

I put " the biggest tire I could" on, back in the day a 295( 67 Charger) . It was tight to the inner tub but worked.
Well, until I got a flat on the front, it leaned over and ground the **** out of the inside sidewall.
I'm not as big of a fan of " just barely fits, but fits" anymore.