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Re: 1975 Corvette 4 Speed rear wheels are locked up? (5/15)
 9/22/19 5:40pm
Vetteman75Gold Member
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Wetumpka, AL - USA

Vette(s):
1975 Stingray Coupe 2014 Stingray Convertible


Joined: 1/9/2014
Posts: 23

I noticed that when we try to put the transmission in Reverse the rod/arm is not moving at all.  So I disconnected the the drive shaft and thought well at least I can turn the wheels - WRONG.  They are frozen.  I then tried starting it with out the drive shaft hooked up and the same ole thing it will bog down and die.  So I believe the transmission was caught in Reverse and another gear and then that caused the rear end to break.  So I will be out of a lot of money trying to find both of these.  I will just get some used ones.  Thanks again for your help!

 

Re: 1975 Corvette 4 Speed rear wheels are locked up? (6/15)
 9/22/19 6:13pm
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.


Joined: 7/9/2003
Posts: 585

So with the drive shaft disconnected the rear wheels would still not turn?



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1973 L-82 4 spd

Re: 1975 Corvette 4 Speed rear wheels are locked up? (7/15)
 9/22/19 6:56pm
Vetteman75Gold Member
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Wetumpka, AL - USA

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1975 Stingray Coupe 2014 Stingray Convertible


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Posts: 23

They will not turn?  The other strange thing is that it will still bog down with the engine running and no drive shaft.  It did appear to have 1st, 2nd, 3rd and 4th.  But when you put it in reverse the shifting plate is not moving.  I hope I don't have to purchase a rear end and transmission. 

 

Re: 1975 Corvette 4 Speed rear wheels are locked up? (8/15)
 9/22/19 9:22pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

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#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


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First, verify that the transmission is in neutral. Use a wrench on the linkages underneath, and position each shaft in the center of it's travel. If you get the front two shafts in the center, even if the trans is stuck in reverse, it should no longer bog the engine down. Be careful tho, and do not rev it up without the driveshaft connected to the trans yoke.

For the sound of it, you have two separate issues, but for both the trans AND diff to lock up at the same time is just too weird. Were there any strange noises before this all happened?



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Re: 1975 Corvette 4 Speed rear wheels are locked up? (9/15)
 9/26/19 8:27pm
Vetteman75Gold Member
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Wetumpka, AL - USA

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1975 Stingray Coupe 2014 Stingray Convertible


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Posts: 23

Update on this Corvette.  I have taken the 1/2 shafts off of differential.  I can now turn the wheel hub.  When I grab differential you still can't make it budge.  I have 5 bolts to go to drop it down to see what is going on in the rear end.  I am wonder if the axle locking pin has slipped off and gotten into the gears.  Well anyway I will tackle the transmission after I get this differential turning.  

Re: 1975 Corvette 4 Speed rear wheels are locked up? (10/15)
 9/27/19 7:41pm
F4Gary
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Grapevine, TX - USA

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1972 LT-1 convertible with factory air.


Joined: 8/26/2006
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Yes, you need to check the shifter levers on the tranny.  Make sure as Adam said, that the levers are all pointing straight up and not in a forward or aft detent.



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Re: 1975 Corvette 4 Speed rear wheels are locked up? (11/15)
 10/1/19 11:41am
Vetteman75Gold Member
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Wetumpka, AL - USA

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1975 Stingray Coupe 2014 Stingray Convertible


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Posts: 23

Okay everyone thanks for your inputs.  Here is what I found when I opened up the rear end.  I had lots of bolts sheared off of the big pinion gear on the back side.  What is your take on that.  I know we rebuilt the engine and tranny but I can't believe it produced that much more horsepower.  Anyway would you rebuild this one or just go ahead and find a good used one and hopefully it would hold up.  Not to sure a tooth might not be chipped as I still can't turn the wheels I see a few more bolts down in there.  Any suggestions would be appreciated at this point.  Thanks again Dean

Re: 1975 Corvette 4 Speed rear wheels are locked up? (12/15)
 10/1/19 7:50pm
manchestersharkLifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.


Joined: 10/31/2007
Posts: 1996

In my opinion, it would be best if you called Brian Bair at his business and see if he can take your old one and trade it for a rebuilt one from his shop. That is their business. Corvettes and suspension. He may even have one that would be CORRECT for the numbers aspect if you want OEM status. 

Re: 1975 Corvette 4 Speed rear wheels are locked up? (13/15)
 10/1/19 10:55pm
73shark
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.


Joined: 7/9/2003
Posts: 585

Is the transmission still locked up?



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1973 L-82 4 spd

Re: 1975 Corvette 4 Speed rear wheels are locked up? (14/15)
 10/2/19 7:39am
Vetteman75Gold Member
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Wetumpka, AL - USA

Vette(s):
1975 Stingray Coupe 2014 Stingray Convertible


Joined: 1/9/2014
Posts: 23

Trying to get someone to rebuild the differential or finding a replacement then it will be on to the tranny.  If I had to guess I think it's still in 2 gears.

Re: 1975 Corvette 4 Speed rear wheels are locked up? (15/15)
 10/2/19 9:07am
manchestersharkLifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.


Joined: 10/31/2007
Posts: 1996

My Guess, is your trans problem is shifter related. Take the shifter rods off, and place the attaching plates straight up and down. Then try to turn the output shaft. Another guess, is that the trans locked up between shifts on the road, and the rear took the bulk of the abuse. Trans was tougher than the rear. IMO!