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  Mustangsandmore Forum Archive
  '74 to '78 -- The Mustang II
  Auto-Transmission Problem

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Author Topic:   Auto-Transmission Problem

Posts: 2
From: Laguna Niguel, CA
Registered: Mar 2006

posted 03-01-2006 07:13 PM     Click Here to See the Profile for Eric_S        Reply w/Quote
My friend owns a 1974 Mustang II. I'm not sure which transmission he has, the 3 speed or 4 speed automatic. In any case, the foward gear is not engaging right away, unlike reverse which engages immediately. It takes maybe 10 - 15 seconds for the forward gear to engage.


1) Is this is a sign of a transmission that needs to be rebuilt, in need of a minor repair work, or a tranmssion short of transmission fluid?

2) Where is transmission fluid added? The dip-stick is described in the Haynes repair manual, but I'm told the repair manual doesn't speak about where to add the transmission fluid.


Posts: 3919
From: Arnold, MD, USA
Registered: Jun 99

posted 03-01-2006 07:19 PM     Click Here to See the Profile for IIGood        Reply w/Quote
First, if it's an automatic, it's a 3-speed. 4-speeds were manuals, at least in that era. Which model it is is a different story...the C3, or the C4. Somewhat irrelevant with this problem though. I'm not even completely certain they were using the C4s in the '74s though.

Second, check the fluid level first. My '77 had a similar problem, and it was always a bit low on fluid. Once the fluid was topped off, all was good. But, where the fluid is going may be another question altogether.

Fluid is added through the dipstick tube. Just stick a funnel into the dipstick tube and pour it in there.


Posts: 2
From: Laguna Niguel, CA
Registered: Mar 2006

posted 03-04-2006 11:07 AM     Click Here to See the Profile for Eric_S        Reply w/Quote
Last night after letting the car warm up, we were able to check the transmission fluid level, and unfotunately the fluid level was fine. (IIGood, you were right, the car only has a 3 speed automatic)

Once the engine is warmed up the forward gears engage right away. It's only when the car is cold does it take longer for the forward gears to engage.

What could be causing this problem?


Posts: 48752
From: Saco, Maine
Registered: May 99

posted 03-08-2006 07:19 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
When I've run into this problem before, it was because of a bad gasket between the valve body and transmission case. When the transmission is cold fluid escapes from between the VB and case, then as the temperature climbs and the aluminum in the case expands the leak is sealed and the transmission works fine.

'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

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