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Author Topic:   T 350 tranny question
Dirt Roller

Total posts: 23
posted June 07, 2004 07:32 AM  
If you run the automatic turbo 350 transmission and wanted to run say a 650 rear gear what would you do to the tranny to stay in high gear drive to keep it from down shifting to keep it in high gear from a dead stop?

Thanks for any info.


redneck racing
Dirt Forum Champ
Total posts: 860
posted June 07, 2004 12:41 PM  
We always put a plug on the modulator to help keep it from shifting. I think TCI makes a kit you can use to help keep it from shifting also. Eddie

Dirt Forum Champ
Total posts: 569
posted June 07, 2004 12:59 PM  
Disconnecting the vacuum to the modulator (the little can on the right side of the trans with the vacuum line running to it) will prevent it from up shifting. In other words, when you take off from a stop, it will never shift out of first (or Low 1) on its own in drive.

Disconnecting the detent cable (the cable that runs from the carburetor to the left side of the trans), will prevent it from down shifting on its own.

I think if you dissconnect these 2, it will stay in first or second when you put the shifter in those posistions and stay in high when you put it in drive.

All right transmission experts, tell me where I am wrong. I am no automatic transmission expert, a long time ago I switched to a manual.

Dirt Roller

Total posts: 9
posted June 07, 2004 02:00 PM  
The right way to keep it from shifting is to have a full manual valvebody put in the trans if the budget allows.

Dirt Forum Champ
Total posts: 569
posted June 07, 2004 02:17 PM  
10-4 on that, Mainshaft. The full manual is the way to go, but those things are kinda spendy.

Dirt Forum Champ
Total posts: 5390
posted June 07, 2004 04:53 PM  
Guys hes wanting it to stay in high, not low. The valve body is the only place this can be done, sorry I can't tell you how though.

Dirt Forum Champ
Total posts: 5390
posted June 12, 2004 07:59 AM  
I am running a 350 (been trying to tear it up for 2 years for an excuse to replace with a manual)and we bought a kit made by B&M. I believe it is called "b&m shift kit". I installed and the only thing different from what all these other guys are telling you to do is it came with a plug to replace the vacuum modelator and some of the check balls were moved to different spots. The tranny will operate the same way either option you choose.

[This message has been edited by rusty9cab (edited June 17, 2004).]

Dirt Freak

Total posts: 369
posted July 26, 2004 07:17 PM  
if rpm exceed governer setting the trans will up shift!!!!!!!!!!!!!
go with the b & m trans pack

Dirt Forum Champ
Total posts: 5390
posted July 26, 2004 07:49 PM  
the other way to make sure that the car don't shift is pull the detent cable tight (makes the trans think it is in passing gear always) no upshift
i have had mine shift into 2nd gear before modifying my detent cable
it shifted at about 7500 to 7800 or somewhere around there ? don't remember where but that is close
(t is a fail safe for the trans governor pressure)

Dirt Maniac

Total posts: 148
posted July 28, 2004 11:23 AM  
i got a used T-350 from another racer that had the detent cable pulled up tight. His instructions were put it in 2nd and go. It starts in 1st but shifts itself to 2nd and stays there. I used to have to shift it manually during the starts, this is way better.

Dirt Maniac

Total posts: 123
posted August 02, 2004 06:58 PM  
My TH350 will shift up to 2nd and stay there all race, pretty simple for a dumb guy like me. (plugged and detent cable fixed)

mudd on the tires
Dirt Full Roller

Total posts: 42
posted August 02, 2004 10:06 PM  
i run a 350 auto. with 650 gears.with the cable pulled all the way and in drive took for ever to shift. without the vaccum line hooked up it took for ever to shift. i got the vaccum line hooked up and tried the cable at different tensions and put it and drive and drove it down the road till it shift when i wanted it to. i run it in drive and it shifts through the gears fairly quick, but not to quick. by the time we are moving for the start or restart it is in high gear and i pull 6000 to 6200 rpm

[This message has been edited by mudd on the tires (edited August 02, 2004).]

Dirt Full Roller

Total posts: 34
posted August 03, 2004 09:13 AM  
Do not know if anyone wants it , but I have a new TCI 3210 manual valve body for the Turbo 350 that has been sitting in the shop for to long. Comes with the valve body, spacer plate, gaskets and some small parts. With the manual valve body, whatever gear you put it in is the gear it will start out and stay in. Just checked and Jegs gets $165.96 for them . Will take 80.00 for it .


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