Bought a 66 Fastback GT, has a problem - Vintage Mustang Forums

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post #1 of 29 (permalink) Old 05-19-2017, 05:39 PM Thread Starter
JMM
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Bought a 66 Fastback GT, has a problem

Hi, I just bought a 66 GT A code. The car starts and runs fine, and runs down the road great. The problem it has, is when starting out in first gear, it feels like it's in third. It has absolutely no power in first. To go up a hill you have to rev to high RPM's and burn the clutch. 20mph is about as slow as you can go while in first. All the other gears seem normal and it has no problem pulling hills at normal speeds. I was told it has a 3.25 rear end, even though it was born with a 3.00. It has a toploader 4 speed with a hurst shifter. Does anybody have an idea of what I should check first? Thanks for any help.

Mark


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post #2 of 29 (permalink) Old 05-19-2017, 06:04 PM
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I had your exact setup before swapping the toploader out for a T5Z. I assume you have the Hurst Competition Plus shifter. First thing I would do is get under the car and adjust the linkage (or verify that it's adjusted properly). It's a simple process! The instructions can be found online. Rule out the most obvious things first. They are usually the easiest and cheapest to fix.


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post #3 of 29 (permalink) Old 05-19-2017, 06:24 PM Thread Starter
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Thanks I'll look up the instructions


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post #4 of 29 (permalink) Old 05-19-2017, 06:34 PM
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Pretty sure you're in first gear, not third? Had to ask...,., But, it could be a
close ratio box ; it has a long tall first gear, like a 2:50 vs a wide ratio
which would have something a 2:74 first gear.

Greg Z.
'66 GT
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post #5 of 29 (permalink) Old 05-19-2017, 06:37 PM
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Sounds like the pressure plate has seen better days.

-Mark-

1966 Mustang 2+2

"Money can't buy happiness, but it can buy a race car. And I've never been sad in a race car!"

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post #6 of 29 (permalink) Old 05-19-2017, 06:45 PM
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There may very well be a problem with the clutch/pressure plate, but the fact that it seems to operate normally in all other gears and pulls the hills without issue leads me to believe that it's not finding first gear. I would like to know if the condition is better or worse when attempting a second gear start.
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post #7 of 29 (permalink) Old 05-19-2017, 07:29 PM Thread Starter
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Quote:
Originally Posted by rhutt View Post
There may very well be a problem with the clutch/pressure plate, but the fact that it seems to operate normally in all other gears and pulls the hills without issue leads me to believe that it's not finding first gear. I would like to know if the condition is better or worse when attempting a second gear start.


Good idea. I'll try starting out in second when I get back to town tomorrow.


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post #8 of 29 (permalink) Old 05-19-2017, 07:48 PM
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Yeah, but he already has momentum on his side in the other gears. A second gear start will probably reveal some issues or at least rule them out.

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Patrick
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post #9 of 29 (permalink) Old 05-19-2017, 07:55 PM
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Yeah, but he already has momentum on his side in the other gears. A second gear start will probably reveal some issues or at least rule them out.
If the car gets rolling easier in second gear, I would assume that his shifter is not hitting the gate to first gear and as a result, he's staring in third. Your right about the momentum in other gears, but he did say that it climbs hills without issues.


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post #10 of 29 (permalink) Old 05-19-2017, 07:58 PM
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Is the lever upside down for first and second? Ford did that on the OD 4 speeds.

Tom

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post #11 of 29 (permalink) Old 05-19-2017, 08:44 PM Thread Starter
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I've never had a transmission apart. What would cause the first gear and third gear slots to actually both be third gear?


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post #12 of 29 (permalink) Old 05-19-2017, 10:36 PM
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The shifter is an external device bolted to the side of the transmission (see the attached picture). You don't have to open the transmission, or even remove it to check the actuation of the shifter linkages. It's not that they are both shifting into third gear. You need to determine if the shifter is actually throwing the proper levers in the proper sequence.
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File Type: jpg toploader1.jpg (58.8 KB, 50 views)


'66 GT Fastback, 302, Edelbrock Top End, Holley 670 Street Avenger,
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post #13 of 29 (permalink) Old 05-19-2017, 10:37 PM
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I've got a 3.00 rear gear/Toploader and can almost idle away from a stop.

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post #14 of 29 (permalink) Old 05-19-2017, 11:10 PM
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Would it be possible that the linkage for 1st/2d is installed incorrectly, i.e., upside down, and he's actually starting out in 2d gear when he thinks he's in 1st? Just thinking with my keyboard here...



I've started a blog about my car and adventures: http://65mustangfun.blogspot.com/

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post #15 of 29 (permalink) Old 05-20-2017, 02:45 AM
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My first thought (before I got to the part where he said Hurst shifter) was that he was starting in 3rd----When I got my car it was like that--3rd-huhuhuh,4th-huhuhuh,3rd--zoom,4th zoomzoom. The shifter handle rubbers were shot so bad it would not engage 1 and 2.
Check to see that all the levers are moved when shifting and that the levers are on properly.
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