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#1
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Clutch change and higher quality replacement parts
Hi All,
my TA has the ST-10 trans and have never been a big fan of 4 speeds. This combo is terrible with 3.42 rear. Above 45 mph, I wish it had an OD. Oh well, have decided to live with it for now but, I hate the motor buzzing at hiway and freeway speeds. More stick shift troubles- Activating the clutch had started to change as the engagement area on the pedal motion was changing. My instincts tell me something was cracking/breaking, etc. I removed all the linkage to inspected all of them- all seemed 'ok'. that told me it was either the clutch fork or pressure plate related. Oh Fun! I have to pull the trans- yuck So be it as I did not want to get stuck on the side of the road, etc. Ended up buying the parts at NAPA as neither Auto Zone or Oreily's carried them. this really surprised me The problem ended up being a broken clutch fork- in 2 places. Gladly, I bought the clutch fork as well while at the NAPA store before I tore my car down. With the bell off, I pulled the plate and disc to inspect that. All looked 'OK' but, I replaced them both as well since I was already this deep into it. You stick shift guys may or may not be aware of this- and I want to share for us all to benefit from- The replacement clutch fork from NAPA is much better quality than EOM. This surprised me. It is noticably heavier and thicker metal too and made is USA. Hoping this help you down the road when it is time to service your clutch, etc Looking back, I wish I would have photo'd the 2 together but, did not think of it at the time. Here is a pic of part of the box showing part number, etc
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Hundreds of Pontiacs in Az "Real Pontiacs only..no corporate nonsense!" Facebook- Pontiac Heaven Hosting- 23rd annual Pontiac Heaven weekend- Phoenix pending due to covid Pontiac Heaven Museum in process Phil 2:11 |
#2
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Steve,how many rings on the ST-10?I have a 3.42 first gear ST-10 in my 62 421 GP.I found a set of 2.68s to put in the back,drives like a OD trans now.No feathering the clutch to get it moving and like 1900-2000 on the highway.Tom
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#3
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Quote:
Sounds like your combo is much happier than mine is
__________________
Hundreds of Pontiacs in Az "Real Pontiacs only..no corporate nonsense!" Facebook- Pontiac Heaven Hosting- 23rd annual Pontiac Heaven weekend- Phoenix pending due to covid Pontiac Heaven Museum in process Phil 2:11 |
#4
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Tom, going by memory, for what that is worth, I am thinking these cars were equipped with 2.43 first gears. Does that sound right?
__________________
Hundreds of Pontiacs in Az "Real Pontiacs only..no corporate nonsense!" Facebook- Pontiac Heaven Hosting- 23rd annual Pontiac Heaven weekend- Phoenix pending due to covid Pontiac Heaven Museum in process Phil 2:11 |
#5
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Thanks for the info Steve. My road race project is going to have a Super T-10. I'll have to look into that fork. I want things to be as bulletproof, low-maintenance as possible.
Eric
__________________
"Everybody has a plan until they get punched in the mouth" noted philosopher Mike Tyson Life begins at the end of your comfort zone. “The mind, once stretched by a new idea, never returns to its original dimensions.” |
#6
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Eric, hoping you are well BTW. when you can, maybe compare a stock EOM fork to a NAPA. I think you will be as impressed as I was. Glad I bought it
__________________
Hundreds of Pontiacs in Az "Real Pontiacs only..no corporate nonsense!" Facebook- Pontiac Heaven Hosting- 23rd annual Pontiac Heaven weekend- Phoenix pending due to covid Pontiac Heaven Museum in process Phil 2:11 |
#7
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Eric,they made a lot of ST-10 first gear ratios.The strongest as I was told was the iron case 2.64 first gear hi nickle gear version used for awhile in NASCAR.The weakest is the one I run the 3.42 first.I believe there is a chart,maybe Richmond showing the TQ ratings by first gear ratios.Tom
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#8
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Quote:
Eric
__________________
"Everybody has a plan until they get punched in the mouth" noted philosopher Mike Tyson Life begins at the end of your comfort zone. “The mind, once stretched by a new idea, never returns to its original dimensions.” |
#9
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#10
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Road race ST-10
https://www.richmondgear.com/wp-cont...hmond/RG26.pdf |
#11
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I would think so if original.Tom
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#12
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Correct
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey 1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles 2017 Sierra SLT 1500 Z71 4X4 2019 Canyon SLT Crew 4X4 |
#13
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I had a 3-something first gear ST-10 aluminum case in the 79 Camaro with a stout 383 I autocross for a long time before it got the IA swap. Never had any issues with fork and I was even using an old 3 finger Zoom I had left over from my high school Impala! Also the Lakewood scattershield.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#14
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Just for conversation, both of the ST-10's I had in my '79 t/a, both split the cases under the torque of a healthy 455.
I had Paul Cangelosi build a custom fine spline M22 4 speed consisting of new Autogear supercase, steel midplate and new gearsets (optional ratios), along with other high quality hardware he uses. Trans is rated for 600ft.lbs. torque and price was $2400. No more grenaded ST-10's. https://www.5speeds.com/
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Home of WFO Hyperformance Shaker induction. |
#15
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the NASCAR ST-10 had a steel midplate and castiron case to help it live.Tom
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#16
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yes, but you won't find those from a retail outlet..........
__________________
Home of WFO Hyperformance Shaker induction. |
#17
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I had one,Bill Blair offered me one.I have seen the cases and mid plates for sale also.Tom
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#18
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I had always thought that the ST-10 was a stronger, better trans than the Muncies were but, could be wrong.
I remember 35-40 years back. I had just finished up a '69 4 speed GTO Judge to sell and was playing with it, etc. I powershifted into 2nd gear and lost the trans. Al the worked was 4th gear. I limped it home and replaced the trans before I sold the car. ouch Have seen and heard of countless Muncies blown up but, not so many ST-10s. Still happier with my automatics, esp 700s. I do have a new, pricey 6 speed dual OD trans I bought but, have not used it yet. Saving it for my 69 GTO build. That stick shift trans I may like, we will see
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Hundreds of Pontiacs in Az "Real Pontiacs only..no corporate nonsense!" Facebook- Pontiac Heaven Hosting- 23rd annual Pontiac Heaven weekend- Phoenix pending due to covid Pontiac Heaven Museum in process Phil 2:11 |
#19
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save your money and get a TREMEC no matter what anyone says the ST 10 is a crude trans as well as Muncies The Tremec is so smooth
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JIM |
#20
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Agree 100% with the above statement.........but you can completely rebuild a Muncie or BW T-10 with a hammer, adjustable wrench, screw driver and pair of snap ring pliers. Try that with a Tremec? They require special holding fixtures, a press and all the bearings are basically one time use because of the plastic cages. Tremec is a super nice trans when in 1 piece.
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