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Topic: 7.5" or 8.8" (Read 1346 times) previous topic - next topic

7.5" or 8.8"

my brother bought a 1978 mercury zephyr with a built 302 but we don't know what axel it has in it? but I did a burn out and it was posi. but the door says code B for axel but the axel has a tag on it but it is rusted smooth.

1978 Ford Thunderbird Town Landau.
351 mod... not for long :beatyoass:
 

7.5" or 8.8"

Reply #1 –
http://www.coolcats.net/tech/general/axleinfo.html  If it's more round-looking you got an 8.8 but if it has those longer straight edges on the top and bottom it's a 7.5.
1987 20th Anniversary Cougar, 302 "5.0" GT-40 heads (F3ZE '93 Cobra) and TMoss Ported H.O. intake, H.O. camshaft
2.5" Duals, no cats, Flowmaster 40s, Richmond 3.73s w/ Trac-Lok, maxed out Baumann shift kit, 3000 RPM Dirty Dog non-lock TC
Aside from the Mustang crinkle headers, still looks like it's only 150 HP...
1988 Black XR7 Trick Flow top end, Tremec 3550
1988 Black XR7 Procharger P600B intercooled, Edelbrock Performer non-RPM heads, GT40 intake AOD, 13 PSI @5000 RPM. 93 octane

7.5" or 8.8"

Reply #2 –
I show a code B as a 7.5" 2.47:1 non locking axle. So chances are that it's been changed at some point.
Matt
1984 Thunderbird - 89 302 HO, GT40 heads w/ Trick Flow springs, E303 cam, Edelbrock Performer 289 intake and 600 cfm 4bbl, Mustang headers, Jegs o/r H pipe, Dynomax lers, Mustang AOD and shifter, Mustang 8.8 w/ 3.73s, 3G alternator, Mustang front and rear sway bars, KYB SN-95 front struts and shocks, and 11" front brakes.

1988 Mustang GT - GT40 heads, Explorer intake, 70mm throttle body, 70mm MAF, Crane 1.7 rrs, E303 cam, Kirban Kwik shifter w/ Pro 5.0 deluxe handle, aluminum clutch quadrant and firewall adjuster, o/r h pipe, Dynomax lers, 3G alternator, aluminum radiator, and 3.27 gears.
 
1986 Cougar 5.0, 1989 Mark VII LSC 5 speed, 1980 Mercury Zephyr 4 door (sold)

7.5" or 8.8"

Reply #3 –
Wow I didnt know they ever made anything higher than a 2.73. Thing must have been a pig. Wonder what engine it had originally. I cant see anyone leaving that thing in there anyway after an engine swap.
93 Festiva L, 193k miles, BP+T/G25MR swap, T3 50trim .48/.42, SRT FMIC, Capri electronics/Rocketchip, 2.5" exhaust
bests: ET 12.86, MPH 110.25, 1.92 short
02 Subaru Impreza WRX, 129k miles
97 Subaru Impreza Outback Sport, 236k miles

7.5" or 8.8"

Reply #4 –
And that's not the highest ratio.

Code G was a 7.5" 2.26:1 non locking
Code H was a 7.5" 2.26:1 locking
Matt
1984 Thunderbird - 89 302 HO, GT40 heads w/ Trick Flow springs, E303 cam, Edelbrock Performer 289 intake and 600 cfm 4bbl, Mustang headers, Jegs o/r H pipe, Dynomax lers, Mustang AOD and shifter, Mustang 8.8 w/ 3.73s, 3G alternator, Mustang front and rear sway bars, KYB SN-95 front struts and shocks, and 11" front brakes.

1988 Mustang GT - GT40 heads, Explorer intake, 70mm throttle body, 70mm MAF, Crane 1.7 rrs, E303 cam, Kirban Kwik shifter w/ Pro 5.0 deluxe handle, aluminum clutch quadrant and firewall adjuster, o/r h pipe, Dynomax lers, 3G alternator, aluminum radiator, and 3.27 gears.
 
1986 Cougar 5.0, 1989 Mark VII LSC 5 speed, 1980 Mercury Zephyr 4 door (sold)

7.5" or 8.8"

Reply #5 –
No Fairmont or Zephyr ever got a 8.8 from the factory... So if it does have one, it's been swapped and the door tag info is useless...

7.5" or 8.8"

Reply #6 –
Don't you know? All the cool kids have 2.26 open 7.5's...lol...shift to second gear at 65mph...lol.

Even though both tires spun, it could still very well be an open rear.
Project 3G: Grandpa Grocery Getter-'85 Crown Vic LTD 2-door, 351W with heavily ported/polished GT40 heads, heavily ported/polished Typhoon Power Plus upper & lower intake, Comp Cams 265DEH retarded 1*, FAST EZ-EFI, HD T5, 8.8" 3.73 trac lock with extra clutches, 3G alt. swap, '99 CVPI front brakes, '09 CVPI rear disc brakes, '00 CVPI booster&m/c + wilwood adj prop valve.

Parted & Gone-'88 T-bird Sport, 351W swap, ported GT40 heads

7.5" or 8.8"

Reply #7 –
2.26 non-locking rear! gotta get me one of those:mullet:
"Beating the hell out of other peoples cars since 1999"
1983 Ford Thunderbird Heritage
1984 Ford Mustang GT Turbo Convertible
2015 Ford Focus SE 1.0 EcoBoost

7.5" or 8.8"

Reply #8 –
Quote from: Ductape91;217241
2.26 non-locking rear! gotta get me one of those:mullet:


I'm sticking with my 4.11's