Got some new wheels: Boss 338's in 20x10 and 20x8.5

[ksbrktracer]

Originally Posted by spidermn

Has anyone ran 22x9.5 on all 4 corners and if so do you have any pictures. i am debating on 20' or 22's. Not sure which would look better. I also am running a 5.5/7 inch drop on the truck.

If it helps any the 22X9.5 only shows one backspace of 5.75" . 20"s would definitely be less work unless you did 20's and 22's which would be cool. I have a few customers who have done that with daytona's and other wheels. I dont have any personal experience with the 22" 338 wheel on a 67-72. Other than I am in the middle of lowering a 70 short step for a customer and we are doing 22X9.5's on the back and 20X8.5's on the front. It will be a little while but I will post pics when I get further along. Just pulled the Axles today to get them machined for 5-lug. I am doing a 4.5" -6" drop on it along with 5-lug discs on front.

I am guessing I am going to have to run a spacer on the rear to get the wheel where I want it ........ we will see though.

[lolife99]

A 22x9.5 (with a 5.75" BS) is the same as a 8.5" wide wheel (with a 4.75" BS)
In my opinion,... this isn't enough backspace up front with a stock crossmember and stock width a-arms.
Most people run a 8.5" wide wheel up front with a 5.25" BS because that's all that is available.
(I like 5.5"-5.75" BS on my 8.5" wide front wheels)

22's can be made to work as long as you keep your overall tire height in check.
I doubt you can do this with the stock inner fenders installed.

[spidermn]

i am running 22x9.5" panthers on it right now but am rubbing on the passenger side. i think it would be less of a headache to just go with the 20's and smaller width so they can fit better in the fender. i am also running a 5.5 inch static drop in the front. am i going to have to put spacers on the front or back for fitment?

[ksbrktracer]

Originally Posted by spidermn

i am running 22x9.5" panthers on it right now but am rubbing on the passenger side. i think it would be less of a headache to just go with the 20's and smaller width so they can fit better in the fender. i am also running a 5.5 inch static drop in the front. am i going to have to put spacers on the front or back for fitment?

If you have a fleetside with the wider rearend ... late 70 and newer ......20X10 with 5.50BS will fit on the rearend. If you 71 and newer parts on the front ( there are other scenario' also that this will work, aftermarket spindles etc. ) .... 20X8.5 with 5.25 BS will fit. And this setup requires no spacers

As Lo-Life was saying a little more backspace would be Ideal but when it comes to cast wheels you are limited by what the manufacturer makes and 5.25Bs in the 8.5 is the best I have seen any company do. Something else that Lo-Life touched on is narrower control arms would be the same basically as using a wheel with more backspace as it pulls the wheel and tire further under the truck.

If you were to have wheels made then you could specify exactly what you want .... BUT that doubles the price of the wheel almost.

Disclaimer ..... !!!!!!!!!! I'm not an expert at this as there is always something new popping up. Given whats out there the above combo does work and looks the best to me....

[magwakeenercew2jh]

Originally Posted by bryan76

Posted via Mobile Device
Posted via Mobile Device

Rt. spin.

[magwakeenercew2jh]

Originally Posted by magwakeenercew2jh

Here are a couple of shots of the earlier 338's. 8.5 x 20 in front with a 245/40 and a 1" spacer. The rear is a 20 x 10 with 275/45's and a 1.5" spacer.

I had room in the back with that set up *before* I put on the 1" spacers...But only by 1/4" before it hit the bed on the inside edge. The ECE adjustable
panhard bar allowed me to center things to get the 1/4" even on both sides.

But the 338 folks only offered that 6.225" BS (I'm talking rear...I don't remember the front stats)
when I bought them. And, I was too far under the bed. So, at first I went with the 1" spacers in the rear.

Next was a move of the spacers to the front. And new spacers... a little wider (1.5")..... on the rear.

So, this is how she sits now with the ECE 4.5/6 drop (spindles and springs in the front, and springs in the rear....
...Not that it matters for this conversation, but a big, fat anti-sway bar up front and also ECE shock relocation
kit all around.

Oops! I forgot...The rear end is '71. That, I believe, is important. Width-wise....Just to make these stats make sense.

Here are a couple of "better" pics than I posted before with the same stats as above. No rubbing. No issues like that.

When I wear out the 275's in the rear, it looks like I have room to go with 295's. Likely, then, I'll raise the front end up by 1" or 2"
to get the whole truck a little more level. We'll see. Was going to go with bags in the rear. But suggestions from wiser minds prevailed.

[Inthuwind]

Sharp!!!

[mikesC10]

Anybody have any pointers for running 20x10 Boss 338's on a 60-66 fleetside with a '72 rear axle? My rear axle overall length is 65". Should I order the 5.5" bs or the 6.23" bs. I want to run a 295/40/20 tire. Thanks!!

[lolife99]

Originally Posted by mikesC10

Anybody have any pointers for running 20x10 Boss 338's on a 60-66 fleetside with a '72 rear axle? My rear axle overall length is 65". Should I order the 5.5" bs or the 6.23" bs. I want to run a 295/40/20 tire. Thanks!!

I'm thinking you will need the 6.225" BS.
I would just get out a tape and measure your truck yourself.

Did you install an adjustable track bar so you can verify the rearend is centered in the truck?

[mikesC10]

Thanks for the advice LOLIFE99. Best for me to measure once the bed is back on......just eager to order wheels!! I did install the adjustable track bar and shock relocate kit from Early Classic to get things centered. Thanks again.

[lolife99]

Just remember, when measuring,... a 10" wide wheel is actually 11" outside-to-outside.

[sublime1996525]

Truck is sexy! Love the rims.

[breeze85cten]

Here are some pics of my ride with 20x8.5 black Boss 338's. Picked them up from Discount about a year ago and love them! I had no problem fitting them on my ride. I have 1'' rotors and they already made the changes to the center to fit over the wheel bearing portion. Would have gone with a deeper dish on the rear except it wouldnt have fit with my link set up in the rear. Also I can rotate the wheels for longer life time! Let me know what you think.

[brossow]

The wheels for because of your 1" rotors, not because of any changes they supposedly made. 55 pages of this thread confirm that. Nice ride!

[del4fun]

Originally Posted by ksbrktracer

[
First off let me qualify this by saying .... I havent suffered thru 3-4 years of frustration with this wheel and secondly I am in no way trying to argue with anyone .... Just stating my opinions is all. I can tell you... all I have read is this wheel wont fit these trucks , Yet the first 3 trucks I went to put them on ... they fit with absolutelly no mods whatsoever ..... and that is on 1-1/4 thick rotors that I personally measured. Yes you guys are right .... they dont fit everything as evidenced by my 2wd blazer.... but so far I am batting 75% and I havent modified anything whatsoever.

It is personally one of my favorite all time wheels and also .... I love the fact that it is an AMERICAN made wheel. Again Im not tryin to argue , just trying to offer useful information and I dont claim to know it all ....... I tell lots of people to talk to lo-life everyday as he has a vast amount of knowledge concerning these trucks. Hope no one is offended ............ !

So lets say you grind down the rotor hub dimensions a little bit, so the boss wheel is not touching on the wheel inside. Would that work just the studs holding the wheel not the hub?

[ksbrktracer]

Originally Posted by del4fun

So lets say you grind down the rotor hub dimensions a little bit, so the boss wheel is not touching on the wheel inside. Would that work just the studs holding the wheel not the hub?

We are talking about cleaning up the snout of the rotor and a very minor amount at that. Besides the fact that, that is not were the wheel sets or centers off of. Where it centers off of is fine.... You dont cut there or clean that part up.

[magwakeenercew2jh]

Originally Posted by del4fun

So lets say you grind down the rotor hub dimensions a little bit, so the boss wheel is not touching on the wheel inside. Would that work just the studs holding the wheel not the hub?

Del...Man....Brother....Hey...Rotor Hub holds nothing.

Like I told you in the pm's, grind enough to assure that the wheel fits flat on the rotor's mating surface, and torque your nuts properly.

[del4fun]

Thanks my C10 brothers