T-10 Riddle - Vintage Mustang Forums
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Old 08-29-2018, 12:28 PM Thread Starter
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T-10 Riddle

I have a T-10 in my May of 65 Fastback, I just pulled it out for servicing and will take this opportunity to ask some questions. Is it original to my car ? If not what is it originally from ? Been driving this car since 1968 and the original and only owner never mentioned replacing the trans. I always assumed it was the born with transmission. Other informed sources say maybe not ? I can't seem to get any real good info so asking for some help with this one ? T-10 close ratio 4 speed transmission, Tag reads HEK-V, 10 spline IN and 28 OUT, 1 groove on the input shaft, case is marked T-10 H-1, dated A22 and assembled March of 65, tailshaft is marked T10 7B dated Sept, 64, Shifter plate-9bolt (aluminum) marked T10-148B and dated April 65. Thanks, Brian

5R09A 4 Speed GT Built 5/29/65
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Last edited by Brian Conway; 08-29-2018 at 12:33 PM.
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Old 08-29-2018, 03:31 PM
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It is very likely that is the original T10 for your car.

I don't think you need to think about it further with the evidence you have.
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Old 08-29-2018, 03:46 PM
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Found this chart T-10 and a little further poking around the V does indicate close ratio with 2.23:1. I'm wondering if your car came with a optional rear axle ratio? A wide ratio with a 3:1 rear gear is going to have the same over all ratio as a close ratio with something like 3.89's in 1 gear. But definitely the HEK-V is a 65 Mustang code for November 23, 1964 and later.

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Old 08-29-2018, 04:14 PM
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My Mustang was built in April 1965 and it came with a T-10. Never have been able to get a solid source for what the ratios of these (T-10) transmissions were. You said you knew yours was a close ratio (pretty sure mine is a wide) - do you know what the actual ratios by gear are for your transmission?

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Old 08-29-2018, 06:12 PM
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Yeah, the early transmissions are a bit confusing, IIRC they were running short, and used what was available ? My '65 has a close ratio HEK-M ( 2.32 or 2.36 first, I forget ).

'65 A-code coupe, T-10 4-speed, 8" 3.25 limited slip
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Old 08-29-2018, 07:58 PM
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I found this somewhere on the interwebs. When I had my trans out, I simply put it
in first gear and counted the input revs to the output revs.
Attached Images
File Type: jpg T-10GearRatios_zps1ddc7f3d.jpg (53.2 KB, 7 views)

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Old 08-30-2018, 09:04 AM
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I don't know the ratio but my (June or July?) of 65 Mustang was definitely T10 with 3.00 rear gears.

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Old 08-30-2018, 11:02 AM
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Brian's should be a conventional wide ratio shown at the bottom of the chart above. His is an A code with an 8" diff. I will know more when I take it apart for him next week.
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Old 11-01-2018, 01:45 PM Thread Starter
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Got my rebuilt T-10 back. Installed it along with a new 10" diaphragm clutch. Been driving around, less than 100 miles, and am very happy with them both. Been running the Diaphragm for years so nothing new there. The T-10 is a delight. Smooth shifting and quiet. No more grabbing a tooth, missing a shift, whineing or popping out of second. Little stiff here and there but with time and wear in it will be fine. Randy confirmed ' wide ratio ' 2.74 first gear. I checked the speedo drive gear and it's a six tooth. The car came the ' 5 ' Trans and ' 1 ' Axle. I have since changed to a 3.00 Traction-Lok. Special thanks to Randy for the rebuild. None of the shops, that I am familiar with, in San Diego are capable of this level of work. With the trans came a bottle of ' FORD ' GL4. Thanks for the interest and help. Brian
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File Type: jpg T-10 Shifting Neutral.JPG (322.6 KB, 3 views)
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5R09A 4 Speed GT Built 5/29/65
9T02R 4 Speed SCJ Built 9/19/68
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Last edited by Brian Conway; 11-01-2018 at 01:57 PM.
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Old 11-01-2018, 06:56 PM
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I rebuilt the T10 in my '65 (Sep 1964 build) and put GL5 in it. It refused to downshift from 3rd to 2nd. Drained the GL5 and installed Redline GL4. Shifts like a dream now.
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Old 11-01-2018, 07:35 PM
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Quote:
Originally Posted by awhtx View Post
I rebuilt the T10 in my '65 (Sep 1964 build) and put GL5 in it. It refused to downshift from 3rd to 2nd. Drained the GL5 and installed Redline GL4. Shifts like a dream now.
Good point - you should not run a GL5 oil in either a T10 or a toploader gearbox - the additives in GL5 attack the bronze parts, synchro rings etc. Use GL4.
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Old 11-03-2018, 12:44 PM
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Data plate on door correct... what is code??
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Old 11-03-2018, 04:27 PM
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Quote:
Originally Posted by 2+2=GT350 View Post
Data plate on door correct... what is code??

The data plate trans code will be 5. It doesn't matter if it's a T10, a Toploader, a Dagenham, a close ratio or a wide ratio, the data plate code is 5 for any 4 speed transmission.
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