Is the orignal trans in my 72 Mach1 a c4 or c6? I took it out yesterday while it was cold and I came to a stop and the car went into neutral for a second and as soon as I let off the brake alittle it went right back into gear. Trans doesnt slip and fluid is nice and pink, I check the fluid today while the motor was hot and running and the fluid is low (first dot at the bottom arrow). I used to have a 64 Plymouth Belvedere that would do the same thing when the fluid was low, hopefully when I add fluid the prob wont happen again. Its only happened to me one time so far and only for a second. but im curious as to what trans my car has? Im paranoid about transmissions ever since my Corvette wit a 4+3 manual (that was awhole other can of worms that i wont get into lol)
What Trans does my 72 Mach1 have?
- Thread starter oldskoool153
- Start date
Platonic Solid
Founding Member
Hyjack
The FMX in my 73 351 2V leaks quite a bit.
I haven't done any diagnostic research, nor do I have any experience with transmissions (outside of swapping a C4 from an econoline van to my 72 coupe about 25 years ago).
Before I jack her up and crawl under there, what are the most likely problem areas and are the repairs manageable via a standard floor jack? I'm not likely to attempt any repair that involves removing the trans as I believe that's best left to a garage with a lift and a trans jack.
It's been a few years since this car's been on the road. Last I recall there was a vibration that may be attributable to an out-of-balance driveshaft.
I suspect the driveshaft as there are signs of some previous owner having a problem, specifically - there is a substantial gouge in the tunnel directly above the rear U-joint. I mention this as being possibly trans leak related.
All pointers and tips appreciated.
Also, repair/replace recommendations on the driveshaft appreciated. Assume normal street/highway use with maybe a trip to the track ... someday.
The FMX in my 73 351 2V leaks quite a bit.
I haven't done any diagnostic research, nor do I have any experience with transmissions (outside of swapping a C4 from an econoline van to my 72 coupe about 25 years ago).
Before I jack her up and crawl under there, what are the most likely problem areas and are the repairs manageable via a standard floor jack? I'm not likely to attempt any repair that involves removing the trans as I believe that's best left to a garage with a lift and a trans jack.
It's been a few years since this car's been on the road. Last I recall there was a vibration that may be attributable to an out-of-balance driveshaft.
I suspect the driveshaft as there are signs of some previous owner having a problem, specifically - there is a substantial gouge in the tunnel directly above the rear U-joint. I mention this as being possibly trans leak related.
All pointers and tips appreciated.
Also, repair/replace recommendations on the driveshaft appreciated. Assume normal street/highway use with maybe a trip to the track ... someday.
If it's coming from the front, it's the front seal. You'll have to pull the trans to change this (but it's easily accessed once the trans is out. Just pull the converter out and you'll see it. If coming from the rear, that can be changed simply by pulling the driveshaft out and changing the rear seal that the slip yoke slides thru. But if you also have a driveline vibe and a leak, the tailshaft housing bushing may need to be replaced, in which case you'll need to pull the driveshaft, then the tailshaft housing off, the bushing is a thin bi-metal sleeve pressed into the housing behind the rear seal. You'll need a new tailhousing gasket too, or you could just make one from gasket material and a small ballpeen hammer. Another leak source is the trans pan gasket, another simple thing to replace. Then lastly, there's the shifter shaft seal, which can be replaced by pulling the pan and unscrewing the shaft retainer nut inside the case, slide the shaft out and replace the O ring.
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