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Best Performance GM Automatic Transmission
#750511 July 10th 2019 5:49 pm
Joined: Oct 2012
Posts: 206
enthusiast
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enthusiast
Joined: Oct 2012
Posts: 206
Hello fellow Vanners,

I am looking to replace my stock GM transmission in my 1977 GMC G20 Van (350 CID).

What do you guys recommend for just street performance?

The first names that come to mind are B&M Transmissions, TCI Transmissions and GM Performance Transmissions. Also what transmissions are you guys running in your GMC & Chevy vans?

Thanks, for your help.


B&M automatic transmissions

TCI transmissions

GM performance transmissions

shift

Last edited by Callahan; July 16th 2019 7:17 pm.

"KEEP ON TR-R-RUCKIN'!"
Re: Best Performance GM Automatic Transmission
Callahan #750512 July 10th 2019 6:07 pm
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Posts: 18,286
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I run a 4L80E in both of my rides


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: Best Performance GM Automatic Transmission
Callahan #750517 July 10th 2019 8:19 pm
Joined: Feb 2016
Posts: 1,266
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old hand
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I assume you have the TH350? Those are pretty stout transmissions in stock GM form, even better with shift kits. You can upgrade the torque converter to one from the TH400 for a bit more robust unit. Are you planning on putting lots of HP through it? One nice upgrade you could do is to go to a 700R4 for an overdrive. The 4L80E requires a computer to run it, which can add undo complexity to a simple solution.

Just my $.02


1987 B250 - Painkiller
Re: Best Performance GM Automatic Transmission
Callahan #750545 July 11th 2019 5:13 pm
Joined: Jan 2014
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All depends on what type of "performance" you're after. TH350 in my G van. Are you looking for a street/strip trans, fuel economy, overdrive interstate cruiser? All models of transmissions have ups and downs. Just have to find one that fits your specific wants and needs.


[Linked Image from live.staticflickr.com]
Re: Best Performance GM Automatic Transmission
frscke1 #750680 July 16th 2019 7:20 pm
Joined: Oct 2012
Posts: 206
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So, your running just the stock OEM transmission. No, upgrades or kits?


"KEEP ON TR-R-RUCKIN'!"
Re: Best Performance GM Automatic Transmission
Death or victory #750682 July 16th 2019 7:32 pm
Joined: Oct 2012
Posts: 206
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Your correct I have a TH350. I like the idea of keeping the stock tranny and upgrading with a shift kit and torque converter. No, on putting a lot of horsepower to it. I am just going to keep it simple with no computers.

Thanks, for your $.02


"KEEP ON TR-R-RUCKIN'!"
Re: Best Performance GM Automatic Transmission
kursed #750683 July 16th 2019 7:36 pm
Joined: Oct 2012
Posts: 206
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I have a TH350 in my G20. I am thinking, just street and interstate cruiser.

Last edited by Callahan; July 16th 2019 7:37 pm.

"KEEP ON TR-R-RUCKIN'!"

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