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MGT 8.0 won't shift into 2nd - 4/25/2011 5:14 PM   
R Dub


 

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From: Hanover Park, IL, USA
Status: offline 		Hello all - Just like the title states my MGT 8.0 will not shift into 2nd gear. It will run like a raped ape all day long in 1st. It will wheelie like a champ and just runs great other than it not shifting. I have tried to adjust the shift point by turning the allen screw counter clockwise but to no avail. Before I rip the trans apart to see if anything is broke I wanted to see if anyone else has had this issue and maybe what it could be. Thanks in advance!


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RE: MGT 8.0 won't shift into 2nd - 4/27/2011 6:49 PM   
AgentDrewski


 

Posts: 57
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From: Davenport, IA, USA
Status: offline 		I am having this issue

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RE: MGT 8.0 won't shift into 2nd - 4/27/2011 6:53 PM   
cummins driver



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From: Danville, KY, USA
Status: offline 		Its most likely the grub screw that holds the 2nd gear sprag onto the shaft. There are 2 grub screws when you look through the shift point adjustment hole in the tranny. The one that goes straight in holds the sprag to the shaft. The other one is angled and is the adjustment screw. If the one holding the sprag to the shaft backs out some, it will never shift.

There is a flat spot on the shaft that the grub screw must sit on. Sometimes you can find it without pulling the tranny apart, but its best to take it apart, reseat it on the flat spot with loctite, and then reassemble.

My 4.6 did this. Not a bad fix, just gotta pull the transmission.

Good luck!

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- Savage - MGT Pulling Truck - Losi LST2 - Brushless Blitz - RC10GT (getting a 2.5) - Brushless T4 - Sportwerks Mayhem Pro

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RE: MGT 8.0 won't shift into 2nd - 4/28/2011 3:11 PM   
AgentDrewski


 

Posts: 57
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Joined: 3/24/2009
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From: Davenport, IA, USA
Status: offline 		aren't the transitions for the 8.0s different then the 4.6s

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RE: MGT 8.0 won't shift into 2nd - 4/28/2011 3:21 PM   
Nickboulin


 

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From: Frederick, MD, USA
Status: offline 		yes, the transmissions are different.


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RE: MGT 8.0 won't shift into 2nd - 4/28/2011 4:33 PM   
R Dub


 

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From: Hanover Park, IL, USA
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quote:

ORIGINAL: cummins driver

Its most likely the grub screw that holds the 2nd gear sprag onto the shaft. There are 2 grub screws when you look through the shift point adjustment hole in the tranny. The one that goes straight in holds the sprag to the shaft. The other one is angled and is the adjustment screw. If the one holding the sprag to the shaft backs out some, it will never shift.

There is a flat spot on the shaft that the grub screw must sit on. Sometimes you can find it without pulling the tranny apart, but its best to take it apart, reseat it on the flat spot with loctite, and then reassemble.

My 4.6 did this. Not a bad fix, just gotta pull the transmission.

Good luck!


Thanks for the input. I will give this a try and let you know if that fixes it.



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RE: MGT 8.0 won't shift into 2nd - 4/28/2011 5:31 PM   
cummins driver



Posts: 4387
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Joined: 3/3/2003
Last Login: 5/19/2013
From: Danville, KY, USA
Status: offline 		They are physically different in a few ways, but they work exactly the same so the same principles apply.

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- Savage - MGT Pulling Truck - Losi LST2 - Brushless Blitz - RC10GT (getting a 2.5) - Brushless T4 - Sportwerks Mayhem Pro

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