Manual Transmission T56 | T5 | MN12 | Clutches | Hydraulics | Shifters

Hard to get T56 into reverse??

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Old 04-04-2009, 12:17 AM
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Default Hard to get T56 into reverse??

i just finished my trans swap monday night. It is verry hard to get the transmission into reverse, i have to push the crap out of the shifter to get it into reverse, and sometimes i just cant get it to go. And also at times it is rough going into 3rd gear. But there is no grinding??? does anyone have any ideah what is going on?
Old 04-04-2009, 12:25 AM
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I had an issue with reverse once. It happened to be a fuse. I think I snagged a wire when installing my headers. A fuse fixed my issue though. I happened to have quite a few out. I suggest you check all of them(the under hood ones)
Old 04-04-2009, 12:36 AM
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check if you've got the Reverse lockout and the 1-4 solenoid connections crossed. . .
Old 04-04-2009, 02:56 AM
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yea i got mine done recently and have the same issue, I havent hooked up the reverse lockout yet. Thats my problem
Old 04-04-2009, 03:22 AM
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reverse lockout
Old 04-04-2009, 03:43 PM
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I dident get a T56 wire harness when i did the swap, i just hooked up the vss sensor and let it ride. I know the reverse lockout is a detent untill you started to get up to speed then it locks out so you cant put it into reverse.
Im not talking about its hard to get past the detent, im talking about after you bring it all the way to the right, past the detent, then push it straight up. It just dont want to go.
Old 04-06-2009, 12:39 AM
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Mine does that too when it's running..when it's off it goes right in. I think it may be the fact that I have to muscle it over. I just did the conversion aswell so the Soleniod doesn't open yet cause it's not tuned.
Old 04-06-2009, 11:18 PM
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its still a 50/50 chance when the car is not running.
Old 04-08-2009, 09:50 AM
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I am haveing this same issue after a clutch install. Wondering if the clearance issues between throwout and pressure plate are correct now.
Old 04-08-2009, 05:39 PM
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I have the same problem. When the car is off it's no problem. When I start it and its cold it won't go in to reverse, until I drive around for a little bit.
Old 04-08-2009, 06:43 PM
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Another possibility is the reverse blocker ring wave washer. Its function is to keep the brass blocker for reverse pushed off of the gear. If the washer gets worn in the center (egg shaped), the washer can drop down and block the reverse slider teeth from engaging the reverse gear. The symptoms are that you have to release the clutch a bit to get the shifter to pop all the way into reverse. The fix is to tear down the back of the trans and replace the washer.
Your issue with 3rd could be a worn or cracked blocker?
Old 04-08-2009, 07:55 PM
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Third gear is not an issue anymore.
Thanks for the input, i will tare it down next time i replace the clutch.
Old 04-09-2009, 08:56 PM
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Originally Posted by the_merv
Mine does that too when it's running..when it's off it goes right in. I think it may be the fact that I have to muscle it over. I just did the conversion aswell so the Soleniod doesn't open yet cause it's not tuned.
same exact thing happens to mine. goes in when its off but not when its running.i also got a 6speed pcm and harness so i dunno whats up. and i find it kinda odd that this is happening to everyone that did the swap lol
Old 04-09-2009, 09:25 PM
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Ha!! I'm having the same issue. It's hard to go reverse. It'll go reverse though. The guy did my swap said he has wired in the reverse lock and I have tune my car w/ M6 stock bin file. So I'm confused.
Old 05-05-2009, 11:39 PM
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HA AGAIN! Yeah I just did a search and found this article, I can't believe how many people have this problem. I just had this happen to me but I've always had a m6 car. One day I go to back out of my drive way and can't put it into reverse. I have to use my left arm (my a lefty as well) and then I have enough power to throw it into reverse.

It would make sense that the reverse lockout is the reason. I just don't know how this happened, and how I go about fixing it. I really don't want to buy a brand new tranny because I plan to do an LS swap eventually. I'll check the fuses though.
Old 05-06-2009, 04:04 AM
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The reverse lockout is a sensor attached to the pedals - looks similar to all the other sensors down that way, no need for a new tranny if it's the reverse lockout sensor.
Old 05-06-2009, 10:30 AM
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all t56 do it.

Last edited by wrb07sti; 05-21-2009 at 04:05 PM.
Old 05-06-2009, 03:46 PM
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Originally Posted by neeshSS
I have the same problem. When the car is off it's no problem. When I start it and its cold it won't go in to reverse, until I drive around for a little bit.
I don't know if this is the same problem as the original poster or others have, but i'll add my two cents in. I bought the 2002 Trans AM M6 new (original and only owner), and ever since day one, I would occassionally have a problem getting the car in reverse.

The stick will resist going into the reverse position, but I would be able to get it in, but when I go to actually back out, the transmission will make a grind noise and car wont move. I'll have to move the stick out of reverse, then back in again, this 2nd time with no problems.

If its going to give me a hard time, its like neeshSS's post, it will be the 1st time starting up (cold) and backing out of the driveway. After that, I dont notice the problem all day/night long.

I had the dealer look at it 2-3 times while under warranty, but we couldnt make it happen at the shop, go figure.

2 years ago now I swapped out the stock clutch for a trex, clutch is great and the 'reverse issue' still happens occassionally. I have no idea why. Maybe its that "reverse blocker ring wave washer" - but I'm not into tearing down the trans to find out.

Last edited by Michael02hawk; 05-06-2009 at 03:55 PM.
Old 05-06-2009, 06:11 PM
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Happened to me when we replaced my clutch and slave cylinder. I'm pretty sure it was the reverse lockout. Check that out like everyone has stated above.
Old 05-06-2009, 07:42 PM
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The ENG SEN (underhood fuse block) 20 AMP fuse (hot in run) feeds the reverse lock out AND the skip shift solenoid (pink wire). The PCM controls both by providing the ground.

The reverse inhibit solenoid is a safety feature which prevents an inadvertent shift into reverse at speeds above 5 km/h (3 mph). The system consist of the following components:

• The powertrain control module (PCM).

• The reverse inhibit solenoid.

With the ignition ON, battery voltage is supplied directly to the reverse inhibit solenoid. At forward speeds above 5 km/h (3 mph) the PCM opens the control circuit of the reverse inhibit solenoid. This de-energizes the solenoid and mechanically blocks the shift lever from going into the REVERSE position.


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