2-4 servo pin
Thread Starter
Teching In
Joined: Sep 2005
Posts: 47
Likes: 1
From: Davie, FL
2-4 servo pin I'm trying to finish up the rebuild on my 4l60e and when I put in the 2-4 servo to test that I get the 1/16 to 1/8 movement, I only get about .010/.015.
I have a new AC Delco reverse drum and new Raybestos wide 2-4 band.
The band is attached to the case and ancor pin, the drum turns fine.
Do I just grind the servo pin to get the 1/16 to 1/8 movement?
Just seems strange to have to grind the stock servo pin
I have a new AC Delco reverse drum and new Raybestos wide 2-4 band.
The band is attached to the case and ancor pin, the drum turns fine.
Do I just grind the servo pin to get the 1/16 to 1/8 movement?
Just seems strange to have to grind the stock servo pin
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Joined: Aug 2010
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From: Ann Arbor, MI
It does seem unusual that the stock pin would be so much too long with those parts.
Even with a brand new reverse drum and wide band, I usually install one Transgo servo shim to get a nice tight servo.
Be sure the servo pin is centered in the eyelet of the band; it might be pushing on the edge with just finger pressure. I usually install the servo before the pump so that I can see that the servo and band are properly installed and engaged.
Even with a brand new reverse drum and wide band, I usually install one Transgo servo shim to get a nice tight servo.
Be sure the servo pin is centered in the eyelet of the band; it might be pushing on the edge with just finger pressure. I usually install the servo before the pump so that I can see that the servo and band are properly installed and engaged.
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Joined: Aug 2010
Posts: 7,323
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From: Ann Arbor, MI
Right.
If you keep the pump out for any extended amount of time (15 minutes?) I would put a resizer back on the sealing rings.
If I don't have an official resizer handy, I just use plastic from a 2L bottle and some hose clamps.
Ted.
If you keep the pump out for any extended amount of time (15 minutes?) I would put a resizer back on the sealing rings.
If I don't have an official resizer handy, I just use plastic from a 2L bottle and some hose clamps.
Ted.
Thread Starter
Teching In
Joined: Sep 2005
Posts: 47
Likes: 1
From: Davie, FL
Well I pulled the pump back out and the band is attached to the case correctly and ancor pin is engaged.
When I put the servo pin in and look down into the case now that pump is removed, I can see that it aligns correctly with the band.
I use a dial indicator to check movement per the instructions from Sonnax.
I see in the ATSG manual they show 3 different pin lengths, by going with the wide band does it require a different pin?
When I put the servo pin in and look down into the case now that pump is removed, I can see that it aligns correctly with the band.
I use a dial indicator to check movement per the instructions from Sonnax.
I see in the ATSG manual they show 3 different pin lengths, by going with the wide band does it require a different pin?
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Joined: Aug 2010
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From: Ann Arbor, MI
I hope you didn't mind my suggestion to pull the pump back out; better safe than sorry. And hopefully it wasn't hard that this point.
I guess it is time to grind down the pin then.
Since the Sonnax instructions for the 4th gear servo mention grinding down the pin, this must be common.
I guess it is time to grind down the pin then.
Since the Sonnax instructions for the 4th gear servo mention grinding down the pin, this must be common.
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Teching In
Joined: Sep 2005
Posts: 47
Likes: 1
From: Davie, FL
No worries about pulling the pump, this being my 1st build I want to be extra sure it's right.
Just wish a pro builder could chime in if it is a common thing to grind the pin.
In the ATSG manual they list 3 different lengths, mine was the middle of the 3 lengths.
If I had the shortest one it would have been very close to the correct amount of movement I think.
I'm going to grind the pin we will see, I'll report back.
Just wish a pro builder could chime in if it is a common thing to grind the pin.
In the ATSG manual they list 3 different lengths, mine was the middle of the 3 lengths.
If I had the shortest one it would have been very close to the correct amount of movement I think.
I'm going to grind the pin we will see, I'll report back.
Thread Starter
Teching In
Joined: Sep 2005
Posts: 47
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From: Davie, FL
Well I took .065 off the pin, now I'm getting .075 movement.
The difference in length between the shortest pin and the one I have is between .050/.070, I wonder if the band I got was made for the shortest pin.
That's the only thing that makes sense to me, because I had the same issue with the stock servo setup and the Sonnax/Corvette servo
The difference in length between the shortest pin and the one I have is between .050/.070, I wonder if the band I got was made for the shortest pin.
That's the only thing that makes sense to me, because I had the same issue with the stock servo setup and the Sonnax/Corvette servo
Thread Starter
Teching In
Joined: Sep 2005
Posts: 47
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From: Davie, FL
Well, got the trans back in the truck and it's shifting fine so grinding the pin seems to have been the correct thing to do.
Many thanks to Ted for his help along the way answering my questions, you sir are a class act!
Many thanks to Ted for his help along the way answering my questions, you sir are a class act!
