Fox T-Bird/Cougar Forums

Technical => Drivetrain Tech => Topic started by: 88xr7cougar on June 19, 2013, 06:29:09 PM

Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: 88xr7cougar on June 19, 2013, 06:29:09 PM
hey having problem with axles i pull from 94 mustang base model to short to install disc brake everything i reads says they should work but there not can install caliper brackets axle doesn't stick out far enough. could use help asap
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: Beau on June 19, 2013, 07:25:32 PM
Post pics of the issue?
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: Chuck W on June 19, 2013, 10:35:53 PM
Get out your tape measure and compare the width of the rear end housing to the chart found in THIS POST (http://www.foxtbirdcougarforums.com/showthread.php?13253-Deciphering-Fox-Axels&p=138359#post138359).

The 8.8 in the '88 XR-7 *should* have the same width housing as the 87-88TC/94-98 Mustang, but you might have an oddball. The axles would be the proper length, so something is up with the housing, or perhaps your install of the caliper brackets.
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: Aerocoupe on June 19, 2013, 11:17:40 PM
Chuck,

Would ABS exciter rings on the 94 Mustang axles cause issues???  I would think if they had them he would have to remove them to get enough length for them to work correctly.

Darren
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: Chuck W on June 19, 2013, 11:31:15 PM
Quote from: Aerocoupe;417340
Chuck,

Would ABS exciter rings on the 94 Mustang axles cause issues???  I would think if they had them he would have to remove them to get enough length for them to work correctly.

Darren

No, they shouldn't. He's saying the axle isn't sticking out far enough, so they're something else amiss.
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: Beau on June 20, 2013, 12:00:14 PM
It's possible that the ABS rings may be an issue, but since OP didn't say yes/no if the axles had them, it's speculation.

My thoughts exactly on the rear's width. Something isn't kosher. The rear is wider than it should be, OR the axles aren't '94-98 length units, OR the ABS rings are indeed on there.

I did look at the chart again after OP posted, I couldn't find a housing dimension for the XR7 8.8 rear listed? I may have missed it though. Posting on my phone right now so have no way to check.
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: Chuck W on June 20, 2013, 12:12:45 PM
The ABS rings wouldn't cause the issue he described (axle not sticking out far enough). At least the way I see it.
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: TOM Renzo on June 20, 2013, 12:30:21 PM
Simple if the axle does not stick out enough you need longer ones!!!
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: 88xr7cougar on June 20, 2013, 08:57:45 PM
Thanks guys but did some more research and found out that the axle housing is 3/4" longer on each side on the 88 xr7 8.8 rearends and that is comparing the two 88 xr7's i have. And both measure the same they measure at 19 1/4 from from backing plate mount to the center where the tube inserts to the carrier and the stock axles are the same length as the 94 to 98 sn95 so longer axles or get mustang rear end so I got mustang rear end  and with the new disc brake setup will have the original track width in the rear as before so no offset issues thanks for your help guys . So to install rear disc on a stock housing I would  suggest the 99 to 04 rear brake system with the longer axles for the 88 xr7
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: Beau on June 20, 2013, 10:56:50 PM
Basically, if you want to go 5 lug, regardless of brake setup, you're going to want/need to use '94-'98 Mustang axles, unless you want to play with custom offset wheels and silly (and dangerous) spacer plates.

Sounds like you've got it figured out now.
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: 88xr7cougar on June 20, 2013, 11:33:44 PM
found answer on a mustang forum where someone was looking at using my style rear end in stang
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: TOM Renzo on June 22, 2013, 07:30:10 AM
Quote from: ThunderbirdSport302;417378
Basically, if you want to go 5 lug, regardless of brake setup, you're going to want/need to use '94-'98 Mustang axles, unless you want to play with custom offset wheels and silly (and dangerous) spacer plates.

Sounds like you've got it figured out now.


THANK GOD someone has some great advice and i am going to save your post 302!!!

Other than myself i find it refreshing that someone other than me has determined and has posted that WHEEL SPACERS ARE DANGEROUS. Thank you so much 302 i thought i was the only one that feels the same. I get POUNDED on this on other Forums. Thanks for posting the dangers of spacers.
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: TOM Renzo on June 22, 2013, 07:40:20 AM
Sometimes i get axles and cut them down to make different lengths. Or custom ones can be ordered from vendors. I have a chart with every axle length for most rear ends. Randys has them listed by splines and overall length. Just saying. No photos any more from me as i got pounded for posting photos on another issue about brakes.
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: Aerocoupe on June 22, 2013, 10:04:14 AM
I guess the 1/4" hubcentric wheel spacers on the rear of my Coupe are dangerous?  Come on guys, if you are going to post up some shiznit like that please qualify the basis of your statement with something like "if you have the stock stud lengths".

Darren
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: Beau on June 22, 2013, 10:30:09 AM
That is kinda the obvious thing, no?

And hubcentric, where the loads aren't just on the studs themselves are better than say those cheap pieces of shiznit you find in the backs of the car mags.

Anyway, the thread prompted me to take that axle/rearend chart and do some research to fill in the missing gaps, as far as some of the missing data. I know it's not first hand, field-measured data, but i cross checked the (few) missing bits I could find with at least 2 other sources to make sure the particular dimension was in fact "correct"...

What it boils down to is...if you want 31 spline axles, there is nothing factory that will work without mods in our cars. Must go aftermarket.

(but I'm sure some of y'all knew that long ago, excuse me for being a late bloomer lol)
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: gumby on June 22, 2013, 04:51:48 PM
Quote from: Maximum Motorsports
The factory wheel studs are usually long enough to allow the use of 1/8" or 1/4" thick wheel spacers, with most wheels. You must check the amount of thread engagement on your car to ensure that at least 6 threads are fully engaged after installing the wheel spacer. Maximum Motorsports 1/2" spacers require the use of longer wheel studs for adequate thread engagement.

Neither the hub nor the studs support any load in a properly bolted wheel/hub situation.

http://www.maximummotorsports.com/store/index.php?main_page=tech_wheels_spacers
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: Beau on June 22, 2013, 05:45:31 PM
Interesting..thanks gumby. good article!
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: TOM Renzo on June 22, 2013, 10:13:56 PM
Ever use a RING GEAR SPACER. They snapped the bolts all the time. Ain't buying it spacers are dangerous. If anyone has built any rear axles with ring gear spacers you would not believe how many bolts were sheered off. You might use spacers they are legal and happy trails but i never use them and never will. Anytime you increase a bolts length on clamping force you decrease the bolts shear numbers. I know there are many cars that use spacers and have good results but those cars lack HP in my view. There is a new federal law on the books about certification of lug nut tightening procedure torque patterns and nut protrusion. I have to follow this to the T or Kansas just might be in my future.I hate the weather in KANSAS.  Granted once again wheel spacers are readily used and accepted but i say they are dangerous and who the hell am i anyway. just me wont use them!! Some of the OFFSET spacers that use lugs in the body and are hub centric are ok. But i still do not use them not at the speeds i drive at !!! Set the car up properly and forget the spacers. No custom rear end builder recommends wheel spacers.

Also the correct amount of threads that must protrude past ANY NUT to correctly clamp properly is THREE according to industry standards. Other than blind holes of course then the depth of the threads are normally deeper. 6 threads on a nut without protrusion would be a violation of bolt safety in some industries. Example nuclear power plants not your kids bike.  Just me.
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: Beau on June 22, 2013, 11:39:33 PM
Nothing wrong with midwest weather...no earthquakes or pesky hurricanes to contend with.
Twisters can be a bitch, at times.

Feds are going to tell people how to tighten lug nuts? Good god, they can't even possibly know how to work on a car, let alone tell someone else how to do it.
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: Aerocoupe on June 23, 2013, 08:32:58 AM
So I guess this setup is gonna fail then:

(http://i786.photobucket.com/albums/yy142/dbrune_83/IMG_2634_zps15f27211.jpg) (http://s786.photobucket.com/user/dbrune_83/media/IMG_2634_zps15f27211.jpg.html)

Wonder which car of mine that is on...

Darren
Title: 88 xr7 8.8 5 lug rear disc swap help
Post by: TOM Renzo on June 23, 2013, 09:59:14 PM
NO BULL shiznit 302 i went to a meeting last week with like 10 DOT BIG WIGS and they laid it on us. Catch this and the torque wrenches must be calibrated every 6 months and you need the paper work to PROVE IT. I shiznit you not. I almost fell off my chair. And further more on public transportation and school buses you better use only factory parts in the front end brakes and all steering components. Other wise KANSAS will be your new address for quite some time. It made me think very hard what the hell is going on in this country right now. Also every commercial vehicle must have ORANGE SEAT BELTS so the cops can see you wearing them. I am as serious as a HEART ATTACK!!

And the lugs must be coted with that tamper indicator yellow paint. OH and the lugs must be re-torqued after 100-200 miles of driving. Aluminum wheels are after 50 miles along with duelies. And catch this the lugs have to have the torque pattern painted on the lugs. You know the pattern like when you torque down a HEAD. I am shocked beyond words. And cant for the life of me digest this and wonder what the future will bring in this business. Naturally as i explained i was blown away with what they were saying

NOTE i asked these guys a question !!! I asked them why MOOG ball joints last much longer than stock ford ones. I also asked them about the law suite won by aftermarket suppliers that states their products match or exceed OEM quality and reliability. Their answer if i get caught i am shagED PERIOD!!!