Topic: 350 turbo transmission question
in Forum: C3 Driveline Components
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Milford, DE - USA
Joined: 11/6/2021
Posts: 67
Vette(s): 1977 C3 Auto Coupe Lt Blue/Dk Blue
Prev. 1968 C3 convertible 4spd Red
1984 C4 Automatic Silver
2000 C5 Automatic Black
I have a stock 77 with a L48 and 3spd turbo 350 Transmission.
Question is..How much can it handle with a engine rebuild or replacement.
I plan on rebuillding or replacing my engine with a small upgrade in horsepower..Not much maybe 50 to 100 hp. Do I need to replace trans with a stronger one. If so what type and how hard is it to replace with a newer one?
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Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #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
IF the trans is in good condition now, then you shouldn't have any issues with it. The stock 350 trans can handle 250-300hp when properly assembled, with stock components.
Joel Adams
C3VR Lifetime Member #56 
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Former Member
Send PM
Milford, DE - USA
Joined: 11/6/2021
Posts: 67
Vette(s): 1977 C3 Auto Coupe Lt Blue/Dk Blue
Prev. 1968 C3 convertible 4spd Red
1984 C4 Automatic Silver
2000 C5 Automatic Black
Thank you
in Forum: C3 Driveline Components
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