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!!!!!!!!!!!! HELP No Reverese !!!!!!!!!!!!!!!!!!!

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Old Aug 20, 2014 | 07:57 PM
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Default !!!!!!!!!!!! HELP No Reverese !!!!!!!!!!!!!!!!!!!

Car: 71 LS5 Stock
Trans: 4 speed M21 stock shift linkage

Hooked up the shift linkage now that the trans and engine are in.

Have all 4 gears but but can not get the gate into reverse as I pull the T and compress the spring.

Looking at all the diagrams I feel I have replaced it as it was supposed to including reverse sensor switch assembly to the case.

How does the interlock work? What does the reverse lever pin do? And lastly if there is any special sequence for set up is required to get reverse to work?

Last edited by 71LS5; Aug 20, 2014 at 08:00 PM.
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Old Aug 20, 2014 | 08:29 PM
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Oh and yes the linkage is connected and I can manually move the lever on the transmission to reverse and back. Its just that the shifter does not allow me to move the reverse at all like its locked out.

Is there a way to check this like remove the T-handle from the shifter and try it or something like that?
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Old Aug 21, 2014 | 12:14 AM
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Some thoughts:

Are you using an aftermarket shifter (Hurst Competition Plus) or the original?

Also, you sure you have the the reverse 'lever' pointing down (not up like the two levers for the forward gears)?

If the levers for the forward gears are not in almost perfect neutral position, she won't go into reverse. You may need to adjust the rods for the forward gears.

Try disconnecting the interlock rod at the lever and see if she shifts into reverse.

Report back.

Last edited by 73, Dark Blue 454; Aug 21, 2014 at 12:16 AM.
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Old Aug 21, 2014 | 02:51 AM
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DarkBlue thanks for responding!

Linkage not changed from original set up that was working.

Stock shifter

Reverse lever tab pointing down

Will check for neutral position on 1-4 but how does that effect Reverse interlock?
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Old Aug 21, 2014 | 06:21 AM
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Hi 71,
When you pull up on the "T" on the shifter handle how far is it coming up?
Has the shifter itself been apart…. if so, was the alignment tool used when it was reassembled?
Disconnecting the interlock cable at the steering column lever will indicate if it's a shifter problem or an interlock problem.
Regards,
Alan
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Old Aug 21, 2014 | 01:04 PM
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Hi Alan, no shifter was not taken apart. T Handle comes up ~ 1 inch

Interlock cable at the steering column lever? Never heard about that. Where what and how does that work?

I never took apart the shifter or the linkage. All I did was drop the trans.

Dark Blue also mentioned making sure 1&2 are set up in the neutral position or else R cant be found.

Right now I have the long throw position for 1-4 and I plan to move them to short throw.
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Old Aug 21, 2014 | 05:21 PM
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Hi,
Here is the interlock cable and connections.
If you disconnect the cable either at the shift lever on the transmission or at the steering column you'll know for sure if it's an unlock problem or transmission/shifter issue.
Regards,
Alan

Interlock cable at reverse lever.


Interlock cable at steering column.
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Old Aug 21, 2014 | 05:41 PM
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Thank you Alan your a big help here keeping our Corvettes alive!

I have never seen this cable I wonder if it was not used in manual trans 1971 on the 454 LS5?

Last edited by 71LS5; Aug 21, 2014 at 05:45 PM.
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Old Aug 21, 2014 | 08:17 PM
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I just checked and I do not nor ever had the cable on the car. The flange on the fire wall is there but I have never seen that cable nor understand what is does or how its used.....
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Old Aug 21, 2014 | 08:40 PM
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Looked under the car and I now remember and see that I have an electric solenoid hooked up on the top of the reverse lever.....reverse light switch.

Last edited by 71LS5; Aug 21, 2014 at 10:06 PM.
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Old Aug 22, 2014 | 02:30 AM
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Bumping......still cant get into reverse. Would like to get this adjusted before I put my exhaust on this weekend. Would appreciate any advice or reference to any documents explaining how to adjust the shifter so it will get into reverse.

Again I don't have the cable and not sure I ever did or even if the manual transmission came with it.
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Old Aug 22, 2014 | 09:23 AM
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I may have missed it, but did you set shifter to neutral position and insert alignment pin into shifter before reattaching linkage?

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Old Aug 22, 2014 | 09:39 AM
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Make sure you didnt lose reverse rear end linkage cotter pin. This just happen to me and you cant really see it clearly from under car. .02
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Old Aug 22, 2014 | 10:38 AM
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Did you replace the clutch? I had an issue getting my car into reverse after installing the rebuilt engine with new clutch kit-changed/moved nothing else in the linkage on the tranny (left the trans in car). Had to adjust free play with new clutch before I could get it into any gear including reverse.
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Old Aug 22, 2014 | 01:37 PM
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Same clutch had very few miles on the Center Force 2
Stock shifter
I have new D-clips on all three linkages

***** NO I did not use the alignment pin to set up the linkages and I believe this to be my problem.

Looking for instructions on how to make and use the tool with the tranny in the car. I have been learning about this in bits and pieces. Would like to see a thread on this or instructions from start to finish.

Last edited by 71LS5; Aug 22, 2014 at 01:57 PM.
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Old Aug 22, 2014 | 02:45 PM
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Originally Posted by 71LS5
Same clutch had very few miles on the Center Force 2
Stock shifter
I have new D-clips on all three linkages

***** NO I did not use the alignment pin to set up the linkages and I believe this to be my problem.

Looking for instructions on how to make and use the tool with the tranny in the car. I have been learning about this in bits and pieces. Would like to see a thread on this or instructions from start to finish.
I had to perform this when I lost my reverse linkage about 6 months ago. You don't need a special tool... just a small drill bit that will pass thru the alignment holes in the fingers (shifter linkage). All you are really doing is centering the shifter linkage in neutral position and then adjusting the linkage on the tranny to neutral position.

I can send you instructions, or you can go to Summit Racing or directly to Hurst web site and download instructions for installing shifter. Instructions will include how to align shifter and tranny linkage to neutral position.

Last edited by Frankenvette; Aug 22, 2014 at 02:47 PM.
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Old Aug 22, 2014 | 02:53 PM
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Thanks Frankenvette, so loosing alignment can cause reverse lock out. This is what I think is the problem with my car.

Will this procedure work on a stock shifter? I understand that the alignment hole is not circular but a slot? Will I be able to do this while the trans is in given the tunnel to trans clearance?
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Old Aug 22, 2014 | 03:01 PM
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Originally Posted by 71LS5
Thanks Frankenvette, so loosing alignment can cause reverse lock out. This is what I think is the problem with my car.

Will this procedure work on a stock shifter? I understand that the alignment hole is not circular but a slot? Will I be able to do this while the trans is in given the tunnel to trans clearance?
It is my understanding that most stock shifters are still Hurst shifters, but I'm not 100% certain. I'm assuming all shifters have the alignment holes. I did this while my tranny was still installed. It's a tight fit to get your hand in there, but unless you have freakishly huge hands, you should be good to go. Just be patient.
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Old Aug 22, 2014 | 03:44 PM
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Looking at a picture I found on the net I see a slot. I think this to be the alignment slot.





Then I found this: I believe this to be the tool but not sure:


http://i91.photobucket.com/albums/k3...ftertool23.jpg

Last edited by 71LS5; Aug 22, 2014 at 03:47 PM.
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Old Aug 22, 2014 | 04:07 PM
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Originally Posted by 71LS5
Looking at a picture I found on the net I see a slot. I think this to be the alignment slot.





Then I found this: I believe this to be the tool but not sure:


http://i91.photobucket.com/albums/k3...ftertool23.jpg
Again, a drill bit of similar size will work just as well. Don't get hung up on the "proper" tool. I used a drill bit myself.
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