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Best Performance GM Automatic Transmission #750511
July 10th 2019 5:49 pm
July 10th 2019 5:49 pm
Joined: Oct 2012
Posts: 179
Oh' Canada
Callahan Offline OP
member
Callahan  Offline OP
member
Joined: Oct 2012
Posts: 179
Oh' Canada
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.


GM B&M automatic transmissions

TCI transmissions

GM performance transmissions

shift


"KEEP ON TR-R-RUCKIN'!"
Re: Best Performance GM Automatic Transmission [Re: Callahan] #750512
July 10th 2019 6:07 pm
July 10th 2019 6:07 pm
Joined: Jun 2010
Posts: 14,342
Van Diego California
frscke1 Offline
frscke1  Offline

Joined: Jun 2010
Posts: 14,342
Van Diego California
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 [Re: Callahan] #750517
July 10th 2019 8:19 pm
July 10th 2019 8:19 pm
Joined: Feb 2016
Posts: 244
Portland, OR
D
Deathorvictory Online content
enthusiast
Deathorvictory  Online Content
enthusiast
D
Joined: Feb 2016
Posts: 244
Portland, OR
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


1979 Dodge B200 Shorty, 1987 B250 Longy
Re: Best Performance GM Automatic Transmission [Re: Callahan] #750545
July 11th 2019 5:13 pm
July 11th 2019 5:13 pm
Joined: Jan 2014
Posts: 515
Staunton, VA
kursed Offline
addict
kursed  Offline
addict
Joined: Jan 2014
Posts: 515
Staunton, VA
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.


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