stock 83 t/a's tranny hold up to a 455?
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Senior Member
Joined: Oct 2008
Posts: 324
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From: Pennsylvania
Car: 86 T/A WS6/Future project
Engine: 350 TPI/ Pontiac 455
Transmission: 700R4/TH400
Axle/Gears: Posi.
stock 83 t/a's tranny hold up to a 455?
H,im new im doing an engine swap into a third gen the engine i have is a 1974 Pontiac 455 not sure of the hp or torque. I also have a th400 tranny that was with the engine. But i was wonderin if the 83's tranny would hold up to all that torque from the 455? also the th400 is auto and the 83's tranny is manual 5 speed.
Joined: Nov 2008
Posts: 2,106
Likes: 181
From: Milwaukee
Car: 92 Firebird, 77 Trans Am SE, 86 Z28
Engine: 5.7 HSR, T/A 6.6, empty
Transmission: T-5, TH350, T-5
Axle/Gears: 3.08 posi, 3.23 posi, 3.23
Re: stock 83 t/a's tranny hold up to a 455?
I'm sure it could hold up for a little while if you have a BOP bellhousing and drive lightly, but drive it hard and it'll break. GM used TH400's for good reason.
. If it was my project, I'd plan on a 200-4R trans. Thread Starter
Senior Member
Joined: Oct 2008
Posts: 324
Likes: 0
From: Pennsylvania
Car: 86 T/A WS6/Future project
Engine: 350 TPI/ Pontiac 455
Transmission: 700R4/TH400
Axle/Gears: Posi.
Re: stock 83 t/a's tranny hold up to a 455?
ok should i run the 5 speed and then later swap in the th400?
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From: Northern Utah
Car: seeking '90.5-'92 'bird hardtop
Engine: several
Transmission: none
Axle/Gears: none
Re: stock 83 t/a's tranny hold up to a 455?
You'll need either an adapter kit or a special bellhousing to run the T5. Start with the TH400 and the Hurst torque arm mount.
Thread Starter
Senior Member
Joined: Oct 2008
Posts: 324
Likes: 0
From: Pennsylvania
Car: 86 T/A WS6/Future project
Engine: 350 TPI/ Pontiac 455
Transmission: 700R4/TH400
Axle/Gears: Posi.
Re: stock 83 t/a's tranny hold up to a 455?
how much do conversion kits cost?
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