Which toploader have I got??? - Vintage Mustang Forums
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post #1 of 8 (permalink) Old 03-22-2010, 04:25 PM Thread Starter
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Default Which toploader have I got???

Dear all,

today I started cleaning up the transmission of my '71 Mach I. It has a 4 speed toploader, but what I found makes me wonder what exact type it is.
Looking at some pictures that claim to show the original transmission (on the 429mustangcougarinfo website) I suspect my toploader can't be the original one. Compared to what I saw, my transmission has some kind of build in switch (for the back up lights).

So does anyone know what type of toploader this is?

Thank you, Manfred
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post #2 of 8 (permalink) Old 03-22-2010, 04:46 PM
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More pictures, or hopefully the tag on the RH side, will help. I suspect you have the 3-speed overdrive, though.

Amateur restorer. Well, sometimes I have been paid for it. But not right now.
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post #3 of 8 (permalink) Old 03-22-2010, 05:48 PM
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Main Case Identification

Looks like a 72 casting used in 72/73 from Kee's ID site.

Casting number and date code?

"True terror is to wake up one morning and discover that your high school class is running the country."
Kurt Vonnegut

8R03S : 76A I 2A 15M 72 5 U
8R01S : 65A B 2A 28M 72 7 5 - Factory GT
8R01C : 65A M 2A 01E 72 2 W - CS/GT
8F01X : 65A I 2G 20E 24 1 U - EXP500 repli-bute


Last edited by dalorzof; 03-22-2010 at 06:00 PM.
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post #4 of 8 (permalink) Old 03-22-2010, 09:03 PM
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around 1971 or 72 ford started putting those switches for either the backup lights or a neutral safety switch even though i would think the neutral safety safety switch should be on the clutch. you can remove the switch and get a plug from dan williams toploaders (828-524-9085) or david key toploaders or keep the switch. i had one of those cases and removed the switch and pluged the hole for my 65. btw that IS a real ford 4 speed toploader and NOT an imposter 3 speed with o.d. !
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post #5 of 8 (permalink) Old 03-22-2010, 09:05 PM
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That is for your reverse lights. I think it is correct for 72-73 but may have been used in 71 or late builtd 71 models?

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post #6 of 8 (permalink) Old 03-22-2010, 11:56 PM
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Here's a real handy site that may help ID your trans for you. You might want to bookmark it for future reference. I use it a lot. Toploader id

1968 modified fastback, aluminum 427 tunnelport 4 speed toploader
1968 coupe 289
'07 Shelby GT500, black with tungsten stripes
1995 SVT Cobra
1967 Fairlane GT 390 4 speed
Videos of my fastback at https://www.youtube.com/user/ohiofirelt?feature=guide
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post #7 of 8 (permalink) Old 03-23-2010, 12:27 AM
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Casting number is on the opposite side of the case by the topcover.

The switch is most likely for the Ford transmission regulated spark system (TRS) that was used in '72. The switch should be open in 3rd & 4th gear.

Nothing worthwhile is ever quick, cheap or easy, those that can't do, complain

71 Mach 1

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post #8 of 8 (permalink) Old 03-23-2010, 03:33 PM Thread Starter
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Thank you all for your help. I know have confirmed by the casting number and the tag that it is a '72 transmission for a Boss or CJ. Unfortunately, the first part of the VIN stamped into the flange is not readable. But I already know from the other information that it is not the original transmission. However, I'm not that much concerned with originallity.

Best regards, Manfred
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