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79 Corvette Shifting

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Old Nov 5, 2005 | 07:23 PM
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Default 79 Corvette Shifting
Hello everyone, I am fairly new corvette owner...so here it goes. I own a 1979 Corvette L-82 with a turbo 350 transmission. Recentlysu I was unable to shift into high gear. I would put the automatic shifting into 3...and the car would shift through 1st and 2nd...but not 3rd. Well, I decided to get the transmission rebuilt. I upgraded to a high performance torque converter, well I just test drove the car and it still doesnt shift into the final gear.....I was traveling about 70 miles and hour..but the tachometer was reading just below the 5000 rpm caution. Shouldnt the car shift into 3rd gear already.....Could someone please let me know what the tachometer typically is reading when you travel 70 mph....need help....any suggestions..thank you
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Old Nov 5, 2005 | 07:33 PM
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From: eville in
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have you called the builder??? did they road test it
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Old Nov 5, 2005 | 08:39 PM
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my red 81
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my th350 will shift in to 3rd at 30 mph if i am driving slow
take it back and make them fix it
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Old Nov 5, 2005 | 08:49 PM
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my 1980 does the same thing. please let me know if you find out what the problem is..
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Old Nov 5, 2005 | 09:05 PM
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
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i can't remember what does that vacuum valve do on the trans????
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Old Nov 5, 2005 | 09:07 PM
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Did you check the shifter and cable to ensure it puts the trans. in 3rd. gear?
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Old Nov 5, 2005 | 09:16 PM
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
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Originally Posted by big_G
Did you check the shifter and cable to ensure it puts the trans. in 3rd. gear?
i thought about that but third is right in the middle not sure how it could miss it
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Old Nov 5, 2005 | 09:32 PM
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From: eville in
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Originally Posted by bobs77vet
i can't remember what does that vacuum valve do on the trans????
1-2 shift i think
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Old Nov 5, 2005 | 10:52 PM
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
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that vacuum modulator does something just can't remember what.....
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Old Nov 5, 2005 | 10:54 PM
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
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that vacuum modulator does something just can't remember what.....is that what forces the down shift to second...
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Old Nov 6, 2005 | 12:19 AM
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From: eville in
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Originally Posted by comp
1-2 shift i think
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Old Nov 8, 2005 | 11:11 AM
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Originally Posted by spille85
Could someone please let me know what the tachometer typically is reading when you travel 70 mph....need help....any suggestions..thank you
My car would be a little over 3000- and at 80 it would be at around 3500rpm. I was having a similar problem, My car would down shift to second then not shift to 3rd. After a couple of months it fixed its self(Dont ask me how) So I said screw it and took it to the shop and I am now getting a th700 now.
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