Help me decide on a transmission
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Joined: Jan 2014
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Help me decide on a transmission
For a topic I'd thought would be beat to death on here, I couldn't find much on transmission choices for autox. I know t56 is the popular choice but unless i can find one for a good deal, looks like it won't be the budget. So trying to decide between th350 or th400. I know th400 are strong but take alot of hp to run, and th350 are not as strong and take away less hp. I'm leaning towards a the th350 but would like to see if I can get some feed back first. The motor will be a stock 5.3 with a drop in cam. Most likely a lm7. So gusstimateing around ~360hp. Planing on eventually running sticky tires too. Not sure on gears yet but most likely going off research will be 3.23 or 3.43s? Stock rear end. You guys think a th350 will hold up? Or should I spend it on a th400. Trying to get running with a used one and then eventually have it built for around a $2k budget?
Joined: Nov 2018
Posts: 249
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From: Kylertown,PA
Car: 85 Berlinetta
Engine: 350
Transmission: T5
Axle/Gears: 10 bolt 3.42 with Torsen posi
Re: Help me decide on a transmission
Don't be afraid of a T5 manual. It will take some abuse and will be much more fun for autocross. I went from a 700R4 to a T5 and the car is so much more fun now.
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Junior Member
Joined: Jan 2014
Posts: 36
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Re: Help me decide on a transmission
I always thought the t5 was just as strong as the 700r4 and barely held up to the stock 5.0-5.7 in autocross. I wss looking at getting something that can be built or used as a core to have built and beable to get the drive shaft set up.
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Junior Member
Joined: Jan 2014
Posts: 36
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Re: Help me decide on a transmission
That was my first choice but after a lot of research came to the conclusion 1st and 2nd gear are to far apart. And even built for $4k there rated for only 400hp. Not really that great for a autox cross trans also overdrive will never really be used efficiently. They don't seem to be as strong as a th350
Supreme Member
Joined: Apr 2010
Posts: 1,201
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From: Armstrong B.C.
Car: 1991 camaro Z28
Engine: Forged 370" LS turbo s488
Transmission: Built 4L80e FTI converter
Axle/Gears: MWC 9" 35 spline 3.25 gears
Re: Help me decide on a transmission
TH400 or 4l80e. 4L80e is the same transmission just with overdrive
Joined: Oct 2020
Posts: 1,462
Likes: 713
From: Franklin, KY near Beech Bend Raceway, Corvette Plant and Museum.
Car: 1992 Pontiac Firebird
Engine: 5.0L L03 TBI
Transmission: 700R4
Axle/Gears: 2.73
Re: Help me decide on a transmission
Why not just use a TH-200-4R with a multi-fit Chevrolet and a B-O-P bolt pattern bellhousing?
They can be built tough, don't soak up as much power as other automatic transmissions, and have a nice gear ratio split.
.
Art Carr 2004R Performance Transmission and Torque Converters
They can be built tough, don't soak up as much power as other automatic transmissions, and have a nice gear ratio split.
.
- 1st gear: 2.74
- 2nd gear: 1.57
- 3rd gear: 1.00
- 4th gear: 0.67
Art Carr 2004R Performance Transmission and Torque Converters
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