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1
Drivetrain Tech / Re: Axle swap
Last post by Beau -
Yeah I saw there were new replies to this, was checking back posts and realized I got it backwards. Glad you set me straight, and I edited my post ;)

Oh, things one forgets when he hasn't touched a Thunderbird in years...and I need to do something about it...
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Drivetrain Tech / Re: Axle swap
Last post by EricCoolCats -
One thing I've learned from owning Fords is to never say 'never' when it comes to non-standard options. All these years later and we're still discovering things.

But Chuck is right, it was the end of the run and there were a bunch of 8.8" rear ends laying around to use up. Just for a bit of background info, there were around 15,000 XR-7 models in 1987, and those all had the 7.5" rear which were also shared on the non-XR-7 models so no biggie. For 1988 Ford ordered up the 8.8" for just the XR-7, and again about 15K of those were sold. But with orders getting canceled, the popularity of the '88 model, market conditions, etc. Ford probably needed more 8.8" rear ends than what it projected in the first place. So having some left over at the end of the model run, Ford likely authorized using them up. I haven't seen any official spec sheets or changes on that, but it's very difficult to find those today, and also right before the model year changes it gets really REALLY crazy in auto manufacturing. They'll throw anything on a car just to get rid of it LOL.

I heard from a few people over the years that claimed to have 1984 taillights on an early '85 model. Some early 1984's came with the 1983 upright hood ornament. We have documented the taillight harness changes between 1987 and 1988. Anything is theoretically possible, but just not likely unless you've got proof. And 90%+ of claims go unproven, lemme tell ya.

So we know these unicorns are out there, and that's wonderful as they are definitely out of the norm and a cool thing to have if you've got one and can prove it. Good on ya, Vintage, that's awesome.
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Drivetrain Tech / Re: Axle swap
Last post by Vintage -

#3 is not correct.  I have a late-build (manufactured date July 1988) Thunderbird Sport that csme with the factory 8.8 axle and 10" smooth drums. Up until a year ago it was factory stock right down to the mufflers, plug wires, plugs, and air silencer in the fender.

I attached a pic of the door jamb label with VIN, manuf date, trim and axle codes, etc if anyone is interested.


You have an exception, and not the rule, at the end of the build cycle for that platform.

It could be similar to the '88 XR-7 in that respect (the 8.8 ), but also many V8 Sports came with the 7.5.

Right. They do exist. I have seen one other 88 Bird that was an LX with the 5L option, was NOT a Sport, and it also had the drum 8.8.  Actually I tried to buy it about 5 yrs ago, as it was a cream puff garage queen owned since new by a senior, but he would not let it go.
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Drivetrain Tech / Re: Axle swap
Last post by Chuck W -

#3 is not correct.  I have a late-build (manufactured date July 1988) Thunderbird Sport that csme with the factory 8.8 axle and 10" smooth drums. Up until a year ago it was factory stock right down to the mufflers, plug wires, plugs, and air silencer in the fender.

I attached a pic of the door jamb label with VIN, manuf date, trim and axle codes, etc if anyone is interested.


You have an exception, and not the rule, at the end of the build cycle for that platform.

It could be similar to the '88 XR-7 in that respect (the 8.8 ), but also many V8 Sports came with the 7.5.













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Drivetrain Tech / Re: Axle swap
Last post by Vintage -
So from what I understand (Chuck or Eric correct me here) is that the:

1) 87-88 Turbo Coupes had the 8.8 rear end that was the same housing width as the 86-98 Mustang 8.8 housing and were disc brake.
Correct.

2) The 88 XR-7 Cougar had a drum brake 8.8 that was the same width as the Turbo Coupe rear end from axle flange to axle flange but the housing is the same as the 86-98 Mustang 8.8 housing and not very common.
Correct. There was a V8 Cougar that had an 8.8 drum brake rear. Narrow housing. Longer axles.
 

3) There were some 87-88 Thunderbirds that had an 8.8 with drum brakes but I believe the housing was wider like the 7.5" housings.
No. There were no 8.8's in any other 83-88 Tbird, other than mentioned in #1 and #2. All 86-88 TBIrds/Cougars (Not listed above) had the wide housing 7.5.

I looked at the chart and the XR-7 is not discussed not is any type of 8.8 drum brake rear end.

#3 is not correct.  I have a late-build (manufactured date July 1988) Thunderbird Sport that csme with the factory 8.8 axle and 10" smooth drums. Up until a year ago it was factory stock right down to the mufflers, plug wires, plugs, and air silencer in the fender.

I attached a pic of the door jamb label with VIN, manuf date, trim and axle codes, etc if anyone is interested.
7
Drivetrain Tech / Re: Axle swap
Last post by Chuck W -
If you look at the chart I linked, the dimensions aren't 100% the same between the two set-ups. When you install the axles and go to bolt up the brakes, you will probably find that the rotor is not centered in the opening in the caliper mounting bracket.
 
Seeing as you have to add spacers, I'm betting it's slightly inboard a bit and needs to be pushed outboard to center it all up.
Spacers/washers between that bracket and the mounting flange on the axle would be needed to accomplish this.
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Drivetrain Tech / Re: Axle swap
Last post by count -
This thread has yielded some good information but I’m alittle confused “will these 99 mustang axles work with some spacing or it’s a unstable setup all together?  JeremyB seems to have had some success with axles. And by the way I appreciate everyone’s input. Aerocoupe, chuck W, Eric, jeremyB and beau.
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Drivetrain Tech / Re: Axle swap
Last post by Chuck W -

So you you were able to use axles from 99-04 and they worked with spacers? What kind of spaces and where did I you place them? 


More than likely on the caliper mounting bracket locations, to get the caliper better centered over the rotor.
It will be pretty evident when you bolt it all up.
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Drivetrain Tech / Re: Axle swap
Last post by count -
It's been a minute, but I'm running 99-04 axles  and SN95 solid discs in my 87 7.5" rear end.

On paper it works perfectly, but I had to put small spacers to get the disc and caliper to properly align IIRC.

So you you were able to use axles from 99-04 and they worked with spacers? What kind of spaces and where did I you place them?